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Welcome to ZTools Documentation

Find a ZTools tool, learn how it works, and check whether the task uses your browser, a server, an account, or a plan.

Getting Started with ZTools

Find a ZTools tool, check how it processes your work, and start in the web or Android app.

Privacy & Analytics — ZTools Documentation

How optional analytics and error monitoring work on the ZTools documentation site, and what you can do to limit them.

ZTools Documentation — Changelog

Version history for the ZTools documentation site.

Explore ZTools — 579 tools in 20 categories

Browse 579 ZTools tools across 20 categories. Many work in your browser; some use a server or provider. Growth tools require sign-in and have plan limits.

Conversion tools — ZTools

Browse ZTools conversion tools, with use cases and examples for each one.

ASCII Art to Image — Render Text Art as PNG, Free

Render ASCII art as PNG / SVG. Pick font, color, background. Browser-only — no signup.

ASCII to Decimal Converter — Free Online, Browser

Convert ASCII text to decimal codes (A=65, a=97). Per-character or run-length output. Browser-only.

Base64 Encoder & Decoder — Text, Files, Images (Client-side)

Encode any text or file to Base64, decode back to original. Supports UTF-8, binary files, data URLs. Runs entirely in your browser — no upload.

Binary to Negabinary Converter — Base −2, Free

Convert binary (base 2) to negabinary (base −2). Curiosity / educational tool. Browser-only.

Bytes to ASCII Converter — Free, Browser-Only

Convert byte arrays (hex or decimal) to ASCII text. Decode binary blobs to readable strings. Browser-only.

Color Converter — HEX, RGB, HSL, OKLCH, CMYK with Live Preview

Convert colors between HEX, RGB, HSL, HSV, OKLCH, OKLAB, CMYK, LAB, LCH. Includes accessibility contrast, color blindness simulation. Free.

CSV to JSON & JSON to CSV Converter — Bidirectional, Online

Convert CSV to JSON or JSON to CSV in your browser. Auto-detects delimiters, handles quoted fields, nested objects flattened safely. Free, no upload.

CSV to XLSX Converter — Build Excel Files from CSV (Free)

Convert CSV to Microsoft Excel .xlsx files. Auto-detects types, preserves headers, supports multiple sheets in one workbook. Free.

Currency Converter — Live FX Rates Across 150+ Currencies (Free)

Convert between 150+ currencies with up-to-date exchange rates. USD, EUR, GBP, JPY, INR, and more. Free, no signup.

Data Storage Converter — Bits, Bytes, KB, MB, GB, TB (Free)

Convert digital storage: bits, bytes, kilobytes, megabytes, gigabytes, terabytes. Decimal (KB) and binary (KiB) modes. Free.

Decimal to ASCII Converter — Free, Browser-Only

Convert decimal codes (65, 97, 32) back to ASCII text. Useful for decoding char arrays. Browser-only.

DOCX to PDF Converter — Word Documents to PDF Online (Free)

Convert Microsoft Word .docx files to PDF: the exact layout, fonts, headers and footers on our server (free Google sign-in), or a simplified PDF in your browser with no upload.

Dog Age Converter — Modern Science Dog Years Calculator

Convert dog age to human age using modern epigenetic research, not the outdated 7-year rule. Breed size adjustment. Free, fun.

HEIC to JPG Converter — iPhone Photos to Universal JPG (Free)

Convert iPhone HEIC photos to JPG instantly. Batch conversion, quality control, EXIF preservation. No upload — runs in browser. Free.

Hex to Text Converter — Free Hexadecimal ↔ ASCII, UTF-8

Convert hexadecimal to text (ASCII / UTF-8) and back. Inspect raw bytes, decode hex dumps, encode for binary protocols. Free.

HTML Entities Reference & Converter — Named, Numeric, Hex (Online)

Look up HTML entities by name, number, or character. Convert between named (©), numeric (©), and hex (©) forms. Free.

IP Address Converter — IPv4, IPv6, Decimal, Hex, Binary

Convert IPv4 / IPv6 between dotted-decimal, hex, binary, integer (32/128-bit), and IPv6 expanded/compact forms. Free.

IP to Hex Converter — IPv4 / IPv6 to Hexadecimal, Free

Convert any IPv4 or IPv6 address to hex notation. Decimal, octet, packed forms supported. Browser-only.

JS to JSON Converter — JS Object Literal to Strict JSON

Convert JS object literal (with single quotes, trailing commas, comments) to strict valid JSON. Free, browser-only, instant.

JS to TypeScript Converter — Free Auto Type Annotations

Convert JavaScript to TypeScript with auto-inferred types, JSDoc-to-types upgrades, and strict-mode hints. Free, browser-only.

JSON to CSV Converter — Flatten Arrays of Objects to Spreadsheets

Convert JSON arrays to CSV with auto-detected headers, proper quoting, and nested-object flattening. Open results directly in Excel or Sheets.

JSON to JS Converter — Generate JS Object Literal Free

Convert JSON to JavaScript object literal with cleaner syntax: unquoted keys, single quotes, optional const/var prefix. Free.

JSON to YAML & YAML to JSON Converter — Both Directions (Free)

Convert between JSON and YAML in either direction. Preserves types, comments where possible, indentation control. Free.

Length Converter — Meters, Feet, Inches, Miles & More (Free)

Convert lengths between metric and imperial: meters, feet, inches, miles, kilometers, yards, centimeters, and millimeters. Free.

Length Converter — Meters, Feet, Inches, Miles, Km Free

Convert length between meters, feet, inches, yards, miles, kilometers, nautical miles, and 20+ units. Free, instant, browser-only.

Markdown to HTML Converter — GFM, Tables, Code Highlighting

Convert Markdown to clean HTML. GitHub-Flavored Markdown, tables, code blocks, syntax highlighting. Live preview. 100% client-side.

Markdown to PDF — Free Browser Converter with Styling

Convert Markdown to a styled PDF with headings, code blocks, tables, images, and CSS theming. Browser-only, no upload, free.

Number Base Converter — Binary, Octal, Decimal, Hex (Free)

Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Negative & fractional. Free.

Octal Converter — Free Decimal, Binary, Hex to Octal

Convert numbers between octal (base 8), decimal (base 10), binary (base 2), and hexadecimal (base 16). Free, instant.

Percentage Calculator — Free Online Percentage Tool

Calculate percentages: X% of Y, X is what % of Y, percentage change, percent increase/decrease. Free, instant, no signup.

RGB to Hex Converter — Color Code Translation Both Ways (Free)

Convert between RGB and hex color codes instantly. Supports HSL, named colors, alpha channel. Live color preview. Free.

Roman Numerals Converter — Free Modern & Ancient

Convert numbers (1–3,999,999) to Roman numerals and back. Standard subtractive notation, vinculum for large numbers. Free, instant.

Speed Converter — mph, km/h, m/s, knots, ft/s & Mach (Free)

Convert speed and velocity: mph, km/h, m/s, knots, ft/s, and Mach number. For driving, running, sailing, aviation. Free.

Temperature Converter — Celsius, Fahrenheit, Kelvin & Rankine (Free)

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Shows the formula. Useful for cooking, weather, science. Free.

Temperature Converter — Celsius, Fahrenheit, Kelvin Free

Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur with formula display. Free, instant, no signup, browser-only.

Time Unit Converter — Seconds, Minutes, Days, Years Free

Convert time between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, centuries. Free.

TypeScript to JS Converter — Free Strip Types Online

Strip TypeScript types and emit clean JavaScript. Free, instant, browser-only. Pick target ES version (ES5, ES2017, ESNext).

Unit Converter — Length, Weight, Volume, Temperature & More (Free)

Convert between metric and imperial units across length, weight, volume, area, temperature, time, and energy. Live updates. Free.

Unix Timestamp Converter — Epoch to Date & Date to Epoch (Free)

Convert Unix epoch timestamps to human dates and vice versa. Supports seconds, milliseconds, microseconds. UTC + local time. Free.

URL Encoder & Decoder — Percent-encode Query Strings Online

Encode special characters in URLs, decode percent-encoded query strings. Handles spaces, Unicode, reserved chars per RFC 3986. Free, no sign-up.

Weight Converter — Kilograms, Pounds, Ounces, Stones & Tons (Free)

Convert weight units: kg, lb, oz, g, st, ton, tonne. Metric and imperial both directions. Cooking, shipping, fitness. Free.

Weight Converter — Kg, Lb, Oz, Stone, Tonnes Free

Convert weight between kilograms, pounds, ounces, stone, metric tonnes, US tons, milligrams, and more. Free, instant, no signup.

XLSX to CSV Converter — Excel to CSV Online, Multi-Sheet (Free)

Convert Excel .xlsx files to CSV instantly. Multi-sheet handling, delimiter choice, encoding control. No upload — runs in browser. Free.

Data tools — ZTools

Browse ZTools data tools, with use cases and examples for each one.

JSON Analyzer — Structure Stats, Key Counts & Type Distribution (Free)

Analyze JSON for structure stats: depth, key count, array sizes, type distribution, longest paths, common patterns. Free.

Array Operations Online — Union, Intersect, Diff, Free

Run set operations on lists: union, intersection, difference, symmetric difference. Works for emails, IDs, words. Browser-only.

Change CSV Delimiter — Convert Comma to Tab, Semicolon, Pipe (Free)

Change the delimiter of a CSV file from comma to tab, semicolon, pipe, or any custom character. Re-quotes fields if needed. Free.

Column Extractor Online — Pull One CSV Column, Free

Extract a single column from CSV or TSV. Pick by index or header name. Output as a list. Browser-only — no upload.

Count Binary Ones — Hamming Weight Calculator, Free

Count 1-bits (population count, Hamming weight) in any binary, hex, or decimal number. Browser-only.

Count Binary Zeros Online — Free, Browser-Only

Count 0-bits in any binary, hex, or decimal number. Configurable bit width. Browser-only — no signup.

CSS Specificity Calculator — Free Online, Browser

Calculate CSS selector specificity (a, b, c). Compare which rule wins. Browser-only — no signup.

CSV Column Mapper — Rename, Reorder & Drop Columns (Free)

Map CSV columns to a new schema. Rename, reorder, drop, and add columns. Useful for import preparation and ETL. Free.

CSV Parser — View, Validate & Browse Any CSV File (Free)

Parse and view CSV files in a sortable table. Custom delimiters, header detection, quoted fields, error reporting. Free.

CSV to Text Columns Online — Aligned, Padded, Free

Convert CSV to fixed-width text columns. Aligned, padded, readable in any monospace viewer. Browser-only.

CSV Viewer — Browse, Sort & Filter CSV in Browser (Free)

View CSV files in a clean sortable table. Filter columns, paginate large files, search any cell. Free, no upload required.

Data Cleaner — Trim, Normalize & De-duplicate Tabular Data (Free)

Clean messy data: trim whitespace, normalize case, remove duplicates, fix encoding issues, validate emails. Free, browser-based.

Diff Merger Online — Merge Two Text Versions, Free

Compare two text files and merge them line by line. Resolve conflicts visually. Works for code, config, JSON, prose. No upload.

Find Duplicate Items in List — Online Free Tool

Return items that repeat in your list, with counts. Spot duplicates instantly. Browser-only — no signup.

Count Items in List — Find List Length Online, Free

Count lines, items, or array elements. Includes empty-line and whitespace toggles. Browser-only — no signup.

Find Unique Items in List — Online Free Tool

Extract items that appear exactly once in your list. Find one-offs, anomalies, singletons. Browser-only — no signup.

Grep Online — Browser Pattern Search, Regex, Free

Search any text for matching lines using regex or plain string. Like grep, in the browser. Highlights, counts, no install.

Hex to Image Converter — Decode Hex to PNG / JPG, Free

Convert hex-encoded image data back to a viewable PNG / JPG / GIF. Useful for forensics, debugging. Browser-only.

HTML Entity Counter — Count &, <, etc., Free

Count HTML entities in any text. Lists every named/numeric entity with frequency. Browser-only.

Invert Binary Bits — Bitwise NOT, One's Complement, Free

Flip every bit (NOT operation) in a binary, hex, or decimal number. Configurable width. Browser-only.

JavaScript Object to JSON Converter — Quote Keys & Strings (Free)

Convert a JavaScript object literal to valid JSON. Quotes unquoted keys, replaces single quotes, removes trailing commas. Free.

JSON Formatter & Validator — Pretty-print, Minify, Lint Online

Paste JSON, get instant pretty-printing, validation, and minification. Detects syntax errors with line numbers. 100% client-side — no upload.

JSON Minifier — Strip Whitespace, Shrink Payloads (Online, Free)

Minify JSON to the smallest valid form — remove whitespace, newlines, and indentation. Cuts payload size 30-60%. Runs entirely in your browser.

JSON Path Finder — Find JSONPath Expressions for Any Value (Free)

Click any value in a JSON document to get its JSONPath expression. Supports both JSONPath and JSON Pointer syntax. Free.

JSON Schema Generator — Infer Schema from Sample Data (Draft 2020-12)

Generate a JSON Schema from any JSON sample. Infers types, required fields, formats. Supports Draft 2020-12, Draft 7, and Draft 4.

JSON to Single Line String — Stringify, Escape, Free

Collapse multi-line JSON into a single escaped string for env vars, CLI args, JS code, or curl bodies. Browser-only.

JSON Tree Viewer — Browse Nested JSON as Expandable Tree (Free)

View JSON as an interactive expandable tree. Collapsible nodes, type indicators, search, copy paths. Free, browser-based.

JSON Validator — Check JSON Syntax, Find Errors by Line

Paste JSON and instantly see whether it is valid. Invalid JSON shows the exact line, column, and a caret at the syntax error. 100% browser-side, no upload.

JSON Viewer Online — Tree, Collapsible, Search, Free

View, expand, collapse, and search any JSON in a tree UI. Handles huge files. Browser-only — no upload, no signup.

List Deduplicator Online — Remove Duplicate Lines, Free

Strip duplicates from any list. Case-sensitive or insensitive, trim spaces, preserve order. Browser-only — no upload.

List Randomizer Online — Random Order Generator, Free

Randomize any list quickly. Pick winners, shuffle teams, randomize quiz questions. Browser-only, fair shuffle.

List Shuffler Online — Randomize Order, Fair Shuffle, Free

Randomly shuffle any list using Fisher-Yates. Fair, unbiased, cryptographically random optional. Browser-only.

List Sorter Online — Alphabetical, Numeric, Natural, Free

Sort any list: A-Z, Z-A, numeric, natural (file2 before file10), reverse, by length. Browser-only — no signup.

Obfuscate JSON Online — Hide PII, Mask Keys, Free

Mask sensitive values in JSON (emails, phones, IDs) for sharing. Replace with hashes or fixed tokens. Browser-only — your data stays local.

Reverse Hex String — Endianness Swap, Byte Order, Free

Reverse hex strings: byte order, nibble order, or full string. Endianness conversion. Browser-only.

Shuffle Binary Bits — Permute Bit Positions, Free

Randomly shuffle the bit order of any binary number. Useful for cryptography demos and bit puzzles.

Sort CSV Data — Order Rows by Column, Multi-Sort, Numeric/Date (Free)

Sort CSV rows by any column ascending or descending. Multi-column sort, numeric, date, and natural sorting. Free.

SQL Formatter — Pretty-print, Indent, Beautify SQL (PostgreSQL, MySQL, T-SQL)

Format messy SQL into clean, indented, readable queries. Supports PostgreSQL, MySQL, T-SQL, SQLite, BigQuery dialects. Free, instant.

SQL to JSON Converter — INSERT Statements & Result Sets (Free)

Convert SQL INSERT statements or result sets to JSON arrays. Supports MySQL, Postgres, SQL Server, SQLite. Free, instant.

XML Formatter — Pretty Print, Indent & Validate XML (Free)

Format and pretty-print XML with proper indentation. Validates structure, highlights errors, expandable tree view. Free, browser-based.

XML Minifier — Remove Whitespace, Compress XML Documents (Free)

Minify XML by removing unnecessary whitespace, comments, and line breaks. Optional comment preservation. Reduces size 20-60%. Free.

XML Validator — Check Well-Formedness & Syntax Errors (Free)

Validate XML for well-formedness, mismatched tags, unescaped characters, and DTD compliance. Inline error reporting. Free.

YAML to JSON Converter — Bidirectional, Spec-Compliant, Online

Convert YAML to JSON or JSON to YAML in seconds. Handles anchors, multi-line strings, and nested structures. 100% client-side — no upload.

YAML Validator — Check Indentation & Syntax Errors (Free)

Validate YAML for syntax errors, indentation issues, and duplicate keys. Inline error highlighting with fix suggestions. Free.

Design tools — ZTools

Browse ZTools design tools, with use cases and examples for each one.

App Icon Generator — iOS, Android, Web, PWA Icon Sets

Generate full app icon sets for iOS, Android, web favicon, PWA from a single source SVG / PNG. Free, no upload.

Business Card Designer — Print-Ready Cards in Browser

Design 3.5×2 inch business cards with name, title, contact info, logo. Print-ready PDF / PNG. Free.

Collage Maker — Combine Multiple Photos into One Layout

Build photo collages with grid, freeform, or template layouts. Drag, resize, export PNG. Free, browser-only.

Color Blindness Simulator — Free, Browser-Only

Simulate protanopia, deuteranopia, tritanopia. Verify designs work for color-blind users. Browser-only.

Email Signature Generator — HTML Sig with Logo & Links

Build HTML email signatures with logo, social links, contact info. Copy-paste-ready for Gmail / Outlook. Free.

SVG Icon Generator — Build Custom Icons from Shapes

Build custom SVG icons combining shapes, text, paths. Color, stroke, export. Free, in-browser, no sign-up.

Logo Maker — Build Vector Logos with Icon + Text

Build simple SVG logos: icon + brand name + tagline. 100s of icons, color picker, free, no sign-up.

Meme Generator — Add Top & Bottom Text to Images Free

Build memes by adding top and bottom text to any image. Adjustable font, stroke, color. Free, browser-only, no upload.

Pattern Generator (Advanced) — SVG / CSS Patterns, Free

Generate seamless SVG / CSS patterns: dots, lines, geometric, organic. Customize colors, density. Browser-only.

Photo Editor — Crop, Filter, Adjust Brightness & Contrast

Browser photo editor: crop, rotate, filter, adjust brightness / contrast / saturation. Free, no upload.

Poster Maker — Print-Ready Event & Promo Posters Free

Build A4 / A3 / A2 posters with text, image, color blocks. Print-ready PDF / PNG export. Free, browser-only.

Social Media Banner Maker — Twitter, LinkedIn, FB Headers

Build platform-correct banners for Twitter / X (1500×500), LinkedIn (1584×396), Facebook (820×312). Free, no sign-up.

Online Whiteboard — Free, Browser-Only Drawing

Sketch, draw, brainstorm in browser. Pen, shapes, text, eraser, undo/redo. Export PNG / SVG. No signup.

YouTube Thumbnail Maker — Custom 1280×720 Thumbnails

Build YouTube-ready thumbnails (1280×720) with text overlay, image, color background. Free, browser-only.

Developer tools — ZTools

Browse ZTools developer tools, with use cases and examples for each one.

API Response Mocker — Browser-Only, Free

Build mock API responses with custom status, headers, body. Test client-side error handling. Browser-only.

Bcrypt Generator — Hash & Verify Passwords Online, Free

Generate bcrypt hashes with a salt cost from 4 to 16 rounds, hash a whole list at once, and verify a plaintext against an existing hash.

Cron Job Generator — Free Online, Validated

Generate cron expressions visually. Pick frequency, validate, get the canonical 5-field expression.

CSS Flexbox Generator — Visual Flex Layout Builder with Live Preview

Build CSS flexbox layouts visually. Toggle direction, justify, align, wrap, gap with live preview. Copies clean, production-ready CSS.

CSS Grid Generator — Visual Grid Layout Builder

Visually build CSS Grid layouts: rows, columns, gaps, areas. Live preview, copy CSS code. Free, browser-only.

Git Command Generator — Free Online, Cheatsheet

Generate git commands by intent. Visual builder for clone, branch, merge, rebase, etc. Browser-only.

HMAC Generator — SHA-256, SHA-512, SHA-3 & More, Online

Generate a keyed HMAC signature from a message and secret across 9 hash algorithms, with hex, Base64 or Base64-URL output. Browser-only.

HTML to Markdown Converter — Clean, Lossless, Online (Free)

Convert HTML to clean Markdown. Preserves headings, lists, links, images, code blocks, tables. Strips inline styles. 100% client-side.

JSON to TypeScript Interface Generator — Type-Safe in One Click

Generate TypeScript interfaces from any JSON object. Detects nested types, optional fields, arrays, unions. Saves hours of manual typing.

Markdown Editor — Live Preview, Toolbar, Export

Markdown editor with live preview, toolbar, GitHub-flavored support. Export Markdown / HTML. Free, no sign-up.

Pixel to REM Converter — px ↔ rem ↔ em Calculator

Convert between px, rem, em with adjustable base font size (default 16). Bulk convert lists. Free, in-browser.

SQL Formatter Pro — Pretty-Print SQL Queries

Format messy SQL into clean, indented queries. Supports MySQL, Postgres, SQL Server, BigQuery dialects. Free.

Education tools — ZTools

Browse ZTools education tools, with use cases and examples for each one.

Bibliography Generator — Build Reference Lists in APA, MLA, Chicago

Build, sort, and export full bibliographies in APA 7, MLA 9, Chicago, IEEE. Add multiple sources, copy as Word-ready text.

Citation Generator — APA, MLA, Chicago, IEEE Citations Free

Generate APA 7, MLA 9, Chicago, and IEEE citations from book, journal, website, or DOI inputs. No sign-up, no watermark.

Essay Word Counter — Word, Page & Character Count for Essays

Count words, characters, sentences, paragraphs, pages, and reading time for essays. Live updating, free, browser-only.

Flashcard Maker — Build, Study & Review with Spaced Repetition

Create flashcard decks with front/back text, study with spaced repetition, mark known/unknown. Free, browser-only.

GPA Calculator — Semester & Cumulative GPA on a 4.0 Scale

Calculate semester and cumulative GPA on the 4.0, 4.3, or 5.0 scale. Add courses, credit hours, letter grades. Free, no sign-up.

Grade Calculator — Final Grade & Required Score Tools

Calculate course grade from weighted assignments and the score needed on the final to hit a target letter grade. Free, instant.

Math Equation Solver — Step-by-Step Algebra & Calculus

Solve linear, quadratic, and simple system equations with step-by-step output. Free, in-browser, supports symbolic math.

Note-Taking App — Markdown Notes with Search & Tags

Free in-browser note-taking with markdown formatting, tags, search, and local storage. Private — no sign-up, no upload.

Periodic Table — Interactive Element Reference for Students

Interactive periodic table with element details: atomic number, mass, electron config, oxidation states, properties. Free.

Plagiarism Detector — Heuristic Originality Check for Drafts

Heuristic plagiarism check: highlights repeated phrases, shows duplicate-content patterns. Pre-Turnitin self-check.

Pomodoro Study Timer — 25/5 Focus Cycles for Students

Free Pomodoro study timer: 25-minute focus blocks, 5-minute breaks, longer break every 4 cycles. Track sessions, no sign-up.

Quiz Maker — Create & Share Multiple-Choice Quizzes Free

Build multiple-choice quizzes with timer, scoring, and shareable links. Free, browser-only, no sign-up needed.

Research Paper Outline Generator — IMRaD & Argumentative Structures

Generate research-paper outlines: IMRaD (Intro / Methods / Results / Discussion), argumentative, literature review. Free.

Study Planner — Schedule Subjects, Sessions & Exam Prep

Plan study sessions across subjects with daily / weekly schedules, exam countdowns, and progress tracking. Free, in-browser.

Text Similarity Checker — Free, Browser-Only

Compare two texts for similarity. Cosine, Jaccard, Levenshtein metrics. No upload, no signup.

Typing Speed Test — WPM, Accuracy & Error Tracker

Test typing speed (WPM), accuracy, and per-key error rate with 1, 3, and 5-minute drills. Free, in-browser, instant.

Encoding tools — ZTools

Browse ZTools encoding tools, with use cases and examples for each one.

ASCII85 Encoder & Decoder — More Compact Than Base64 (Online)

Encode binary data to ASCII85 (also called Base85) — 25% more compact than Base64. Used in PDF, PostScript, and Git binary diffs. Free.

Atbash Cipher — Reverse-Alphabet Substitution (Self-Inverse)

Encode/decode Atbash cipher: A↔Z, B↔Y, etc. Self-inverse. Hebrew origin. Free, in-browser, no signup.

Barcode Generator — 1D, 2D, QR & Postal, Free

Generate Code 128, EAN/UPC, QR, Data Matrix, PDF417, Aztec and 30+ symbologies. Download SVG, PNG, or PDF. Browser-only.

Base32 Encoder & Decoder — RFC 4648 Compliant, Online

Encode binary or text to Base32 (RFC 4648) and decode back. Case-insensitive, no ambiguous characters. Used in TOTP, S3 keys, DNS.

Binary Translator — Text ↔ Binary (8-bit ASCII / UTF-8)

Convert text to binary and binary to text. ASCII 7/8-bit and UTF-8 multi-byte. Free, in-browser, no signup.

Binary to UTF-8 Converter — Free, Browser-Only

Convert binary (0s and 1s) to UTF-8 text. Decode binary-encoded strings. Browser-only — no signup.

Bulk Barcode & QR Generator — CSV to ZIP/PDF, Free

Generate hundreds of barcodes or QR codes from a list or CSV, then export a ZIP of images, a multi-page PDF, or an Excel sheet — free, browser-only.

Caesar Cipher — Shift Text by Any Number 1–25 (Free)

Encrypt or decrypt text with a Caesar shift cipher (1–25 positions). Brute-force decode option. Free, in-browser.

Check Digit Calculator — EAN, UPC, GTIN, Luhn, Free

Calculate or verify check digits for EAN-13/8, UPC-A, GTIN-14, ISBN-10/13, Luhn and MSI Plessey codes instantly in your browser. Free, no signup.

Universal Barcode & QR Decoder — Free Online ZXing Reader

Decode QR codes, Data Matrix, Aztec, PDF417, EAN, UPC, Code 128 and more from any image or URL. Full ZXing output, parsed results, 100% in-browser.

Dynamic QR Code Generator with Scan Analytics — Free

Create editable QR codes you can re-point anytime without reprinting, and track scans by country, device, and date — no IP logging, free with a sign-in.

Hash Generator — MD5, SHA-1, SHA-256, SHA-512 Online

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or files. Verify file integrity. WebCrypto API — runs in your browser.

Hex to UTF-8 Converter — Decode Hex Bytes to Readable Text

Convert a stream of hex bytes back to UTF-8 text. Tolerates separators and prefixes. Free, in-browser, no signup.

HTML Encoder & Decoder — Escape Special Characters Safely (Online)

Encode HTML special characters to entities (& → &) or decode entities back to characters. Prevents XSS, fixes display bugs. Free, in-browser.

JWT Decoder — Inspect Header, Payload, Signature (Client-side)

Paste a JSON Web Token, get human-readable header and payload claims. Highlights expiration, algorithm, audience. 100% client-side — never sent.

JWT Encoder Decoder — Sign, Verify, Free Online

Encode, decode, sign, and verify JWTs with HS256, RS256, ES256. Browser-only — secrets never uploaded.

MD5 Hash Generator — 128-bit Checksum for Files and Strings

Generate MD5 hashes of strings or files. Useful for checksums and legacy systems. NOT for security. Free, in-browser.

Morse Code Translator — Text ↔ Morse with Audio Playback (Free)

Translate text to and from Morse code. Audio playback at adjustable WPM. International + American Morse. Free, in-browser.

Punycode Converter — Unicode IDN ↔ ASCII (xn--) Domain Names

Convert internationalised domain names (IDN) to and from punycode (xn--). Detect homograph attacks. Free, in-browser.

QR Code Generator — Free, High-resolution, No Tracking

Generate QR codes for URLs, Wi-Fi, vCards, plain text. Custom size, error correction, color. PNG/SVG download. Runs in your browser.

Quoted-Printable Encoder/Decoder — Email-Safe MIME Encoding

Encode/decode quoted-printable (RFC 2045). Email-friendly representation of 8-bit data. Free, in-browser.

ROT13 Encoder/Decoder — Letter Substitution Cipher (Free)

Apply ROT13 encoding to text. Self-inverse: encode and decode with the same operation. Free, in-browser, no signup.

Serial Number Generator — Sequential & Random, Free

Generate sequential or random serial numbers with prefix, suffix, zero-padding, start, step, and count. Copy, download, or turn them into barcodes. Free.

SQL String Escaper — Escape Quotes and Special Characters Safely

Escape single/double quotes and special characters for safe SQL string literals. MySQL, PostgreSQL, SQLite. Free.

String Encoder — Multi-Format Online, Free

Encode strings: base64, URL, HTML entities, hex, UTF-16. One-click switch between formats. Browser-only.

String Escaper — Escape for JSON, JS, Python, Java, C, Shell

Escape strings for JSON, JavaScript, Python, Java, C/C++, shell. Multi-language. Reverse mode unescapes. Free.

Unicode to UTF-8 Converter — Code Points to Bytes, Free

Convert Unicode code points (U+1F600) to UTF-8 byte sequences (F0 9F 98 80). Browser-only — no signup.

UTF-8 to Binary Converter — Bit-Level View of Text Encoding

Convert UTF-8 text to its binary (0/1) representation. View bit-level encoding for educational and debugging use. Free.

UTF-8 to Hex Converter — Inspect Byte-Level Encoding (Free)

Convert UTF-8 text to its hex byte representation. Configurable separators. Free, in-browser, no signup.

UTF-8 Validator — Check Encoding, Free Online

Validate UTF-8 encoding of text or hex bytes. Detect invalid sequences, BOM, mixed encodings. Browser-only.

Vigenère Cipher — Polyalphabetic Cipher with Keyword (Free)

Encrypt or decrypt with the Vigenère cipher using a keyword. Tableau view. Kasiski analysis. Free, in-browser.

XML Encoder/Decoder — Escape & Unescape XML Special Characters

Encode/decode XML special characters (& < > " ') to and from named entities (&amp; &lt; etc.). Free, in-browser.

Extractor tools — ZTools

Browse ZTools extractor tools, with use cases and examples for each one.

Date & Time Extractor — Pull Dates from Text, ISO Format

Extract dates and times from text in many formats. Normalise to ISO 8601. Free, in-browser, locale-aware.

Domain Extractor — Extract Domains & Subdomains from URLs

Extract registrable domains and subdomains from a URL list. PSL-aware, dedupe, frequency. Free, in-browser.

Email Extractor — Pull Email Addresses from Text

Extract all email addresses from pasted text or HTML. Deduplicates, lowercases, validates format. Free, in-browser.

Hashtag & Mention Extractor — Pull #tags and @handles

Extract hashtags (#tag) and @mentions from social posts, captions, articles. Frequency count. Free, in-browser.

IP Address Extractor — IPv4 + IPv6 from Logs & Text

Extract IPv4 and IPv6 addresses from logs, text, or HTML. Validates octets, deduplicates. Free, in-browser.

Keyword Extractor — Find Top Keywords & Phrases in Text

Extract top single-word and multi-word keywords from text using TF-IDF / RAKE. Free, in-browser, no upload.

Lead Extractor — Extract Names, Emails, Phones, Companies

Extract name + email + phone + company combinations from text or pasted lists. Cleaned, ready for CRM import. Free.

Number Extractor — Pull Integers, Decimals, Currency from Text

Extract integers, decimals, percentages, currency from text. Skip dates / phones. Free, in-browser.

Phone Number Extractor — Pull Numbers from Text, E.164

Extract phone numbers from text. Recognises US, UK, EU, international formats; normalises to E.164. Free, in-browser.

URL Extractor — Extract All Links from Text or HTML

Extract every URL (http, https, ftp, mailto) from pasted text. Dedupe, validate, classify by domain. Free, in-browser.

Finance tools — ZTools

Browse ZTools finance tools, with use cases and examples for each one.

1099 vs W-2 Calculator — Contractor Take-Home (2025)

Compare 1099 contractor vs W-2 employee take-home at the same headline pay, model self-employment tax, and find the 1099 markup that matches. TY2025.

Bonus Tax Calculator — 22% Flat vs Aggregate Method

Compare the IRS percentage (flat 22%) and aggregate methods for federal tax withheld on a bonus, plus FICA. Free, in-browser TY2025 estimate.

Break-Even Calculator — Units & Sales to Zero Profit

Calculate the break-even point in units and revenue from fixed costs, price, and variable cost — plus the units needed for a target profit. Free, in-browser.

Budget Calculator — 50/30/20 Rule and Custom Splits

Split your monthly take-home pay across needs, wants, and savings with the 50/30/20 rule or a custom split. Free, in-browser, no sign-up or data stored.

Business Loan Calculator — Payment & Amortization Schedule

Calculate a business loan’s fixed monthly payment, total interest, and full amortization schedule from principal, annual rate, and term. Free, in-browser.

Business Plan Template Generator — Section by Section

Build a structured business plan section by section — executive summary, market analysis, financials, and more — with guidance prompts. Free, in-browser.

Business Valuation Calculator — Rule-of-Thumb Estimate

Get a rough rule-of-thumb business value from earnings (SDE or EBITDA) times an industry multiple, with a revenue cross-check. An estimate, not an appraisal.

Capital Gains Tax Calculator — 2025 Federal Estimate

Estimate 2025 US federal tax on short- and long-term capital gains with the 0/15/20% long-term brackets and optional 3.8% NIIT. Free, in your browser.

Cash Flow Calculator — Project Monthly Balance & Runway

Project your running cash balance month by month from a starting balance and monthly inflows and outflows, with net flow, ending balance, and runway. Free.

Charitable Deduction Calculator — AGI Limits (2025)

Estimate deductible charitable gifts under the 2025 AGI limits — 60% for cash, 30% for appreciated property — plus 5-year carryover. TY2025, not tax advice.

Commodity Price Calculator — Convert Between Units & Currencies

Convert commodity prices between units (oz, kg, ton, barrel, bushel) and currencies. Free, in-browser, no signup.

Credit Card Payoff Calculator — Minimum Payment Trap

See how long a credit card takes to pay off and the total interest, comparing a fixed payment against the minimum-payment trap. Free, in-browser estimate.

Crypto Price Tracker — BTC, ETH, and Major Coins (Free)

Track cryptocurrency prices: BTC, ETH, SOL, and major coins. Manual or API-based. Educational only — not financial advice.

Crypto Tax Calculator — 2025 FIFO Capital Gains Estimate

Estimate 2025 US federal crypto capital gains with FIFO lot accounting, splitting short- and long-term. Reconcile with your 1099s. Free, in-browser.

Debt Payoff Calculator — Snowball vs Avalanche Plan

Compare the debt snowball and avalanche methods across multiple debts to see payoff time and total interest for each. Free, in-browser estimate, nothing stored.

EMI Calculator — Equated Monthly Installment for Loans (Free)

Calculate EMI (equated monthly installment) for any loan: principal, rate, tenure. Amortisation schedule. Free.

Estate Tax Calculator 2025 — Federal 40% Top-Rate Estimate

Estimate 2025 federal estate tax on the amount above the $13.99M exclusion at the top 40% rate. TY2025 estimate only — not tax or legal advice.

Franchise Fee Calculator — Total Investment & Royalties

Total franchise investment — franchise fee plus startup costs — then project ongoing royalty and ad-fund fees over several years. Free, in-browser, no sign-up.

Gold Rate Calculator — Value of Gold Jewelry by Weight & Karat

Calculate gold value by weight (grams or tola) and karat (24K, 22K, 18K, 14K). Live rate inputs. Free, in-browser.

Home Office Deduction Calculator — Simplified vs Actual

Compare the IRS simplified ($5/sq ft, up to $1,500) and actual-expense home office deduction methods for self-employed filers. Free, in-browser estimate.

Income Tax Calculator — Estimate Federal & State Tax (Educational)

Estimate annual income tax based on bracketed rates. Federal/national + optional state/regional tier. Free, educational.

Inventory Turnover Calculator — Ratio & Days on Hand

Inventory turnover = COGS ÷ average inventory. See how many times stock sold and replaced, plus days inventory outstanding. Free, in-browser, no sign-up.

Jewelry Metal Calculator — Mixed-Metal Value Across a Collection

Calculate combined metal value across a jewelry collection: gold, silver, platinum, palladium. Karat / fineness aware. Free.

Loan Calculator — Payment, Interest, Total Cost for Any Loan

Calculate loan payment, total interest, total cost, and amortisation. Compare loan offers side-by-side. Free.

Medicare Tax Calculator — 2025 Rate & Additional 0.9%

Estimate 2025 Medicare tax: 1.45% on all wages with no cap, plus the 0.9% Additional Medicare Tax over your filing-status threshold. Free, in-browser.

Mileage Deduction Calculator — 2025 IRS Standard Rates

Estimate your 2025 tax deduction from business (70¢), medical/moving (21¢), and charitable (14¢) miles using the IRS standard mileage rates. Free, private.

Net Worth Calculator — Assets Minus Liabilities Snapshot

Calculate your net worth by subtracting total liabilities from total assets, get a debt-to-asset ratio, and track the snapshot over time. Free, in-browser.

Operating Expense Ratio Calculator — OER & Margins

Operating expense ratio (OER) = operating expenses ÷ revenue. Also derives gross profit, operating income, and operating margin. Free, in-browser.

Palladium Rate Calculator — Value of Palladium Pieces by Weight & Purity

Calculate palladium value by weight and purity (.950, .500). Used for jewelry, white-gold alloy, catalytic converters. Free.

Paycheck Calculator — Take-Home Pay After Tax & Deductions

Estimate take-home paycheck after federal/state tax, FICA / NI, and pre-tax deductions. Hourly + salary modes. Free.

Payroll Tax Calculator — 2025 FICA Employee vs Employer

Break down 2025 FICA payroll tax by employee and employer side: Social Security 6.2% to the wage base, Medicare 1.45%, plus the 0.9% surtax. Free tool.

Platinum Rate Calculator — Value of Platinum Pieces by Weight & Purity

Calculate platinum value by weight and purity (.950 standard, .900 hallmark). Free, in-browser, no signup.

Profit Margin Calculator — Gross, Operating & Net %

Calculate gross, operating, and net profit margins from revenue, COGS, and expenses. See profit as a percentage of sales. Free, in-browser, no sign-up.

Property Tax Calculator — Assessed Value & Millage Rate

Estimate annual property tax from your home’s market value, assessment ratio, exemptions, and local millage rate. Free, in-browser, US-focused.

Quarterly Estimated Tax Calculator — 2025 Safe Harbor

Estimate your 2025 federal quarterly estimated tax payments with the IRS 1040-ES safe-harbor rule and see all four due dates. In-browser, no sign-up.

Retirement Calculator — Nest Egg & 4% Rule Projection

Project your retirement nest egg from savings and monthly contributions, then estimate annual income with the 4% rule in nominal and today’s dollars.

ROI Calculator — Return on Investment, Annualised, Compound

Calculate ROI: simple, annualised, CAGR. Investment cost, gain, holding period. Free, in-browser, no signup.

Sales Tax Calculator — Add or Reverse Combined Rate

Calculate US sales tax by adding a combined state and local rate to a price, or reverse a tax-inclusive total to find the pre-tax amount. Free tool.

Savings Goal Calculator — Reach Any Target by a Deadline

Calculate monthly savings needed to hit a goal by a deadline. Optional starting balance and interest. Free, in-browser.

Self-Employment Tax Calculator — 2025 SE Tax (15.3%)

Estimate your 2025 self-employment tax on 1099 or freelance net profit — the 15.3% SE rate, Social Security wage base, and half-SE deduction. In your browser.

Silver Rate Calculator — Value of Silver Items by Weight & Purity

Calculate silver value by weight (g, oz, kg) and purity (.999, sterling .925, coin .900). Free, in-browser.

SIP Calculator — Mutual Fund Systematic Investment Plan Returns

Calculate future value of monthly SIP investments at expected return. Mutual funds / index funds. Free, in-browser.

Social Security Tax Calculator — Taxable Benefits (2025)

Estimate how much of your Social Security retirement benefits is taxable using the IRS provisional-income rule. Free, in-browser TY2025 estimate.

Startup Cost Calculator — Launch Budget & Cash Runway

Estimate what it costs to launch a business — one-time startup costs plus operating cash for an early runway. Enter your capital to see surplus or shortfall.

Stock Portfolio Tracker — Watchlist & Holdings P&L (Free)

Track stock watchlist and portfolio holdings. P&L per position. Educational only — not financial advice. Free.

Tax Bracket Calculator — 2025 Marginal vs Effective Rate

See your 2025 federal marginal tax bracket and effective rate with a bracket-by-bracket breakdown of how each dollar is taxed. TY2025 estimate, not advice.

Tax Deadline Calendar 2025–2026 — Key IRS Dates + ICS

See the key 2025–2026 US federal tax deadlines — filing, extensions, estimated tax, IRA/HSA — with a downloadable reminder .ics file. Reference only.

2025 Tax Refund Calculator — Federal Refund Estimate

Estimate your 2025 federal tax refund or balance due from income, withholding, filing status, deductions, and the Child Tax Credit. Free, in-browser.

W-4 Withholding Calculator — 2025 Paycheck Tax Estimate

Estimate 2025 federal income tax from your Form W-4 and the per-paycheck withholding needed to break even, including any line 4(c) extra amount. Free.

Generator tools — ZTools

Browse ZTools generator tools, with use cases and examples for each one.

API Documentation Generator — From OpenAPI to HTML, Free

Generate clean API docs from OpenAPI / JSON schema. Endpoints, parameters, examples, response codes. Browser-only — no signup.

Barcode Generator — EAN-13, UPC, Code 128, Code 39, ITF (Free)

Generate barcodes: EAN-13, UPC-A, Code 128, Code 39, ITF-14, Codabar. SVG and PNG output. Bulk batch. Free, in-browser.

Bio Generator — Instagram, Twitter, LinkedIn, Free

Write social-media bios under 150 characters with the right keywords + emoji. Instagram, Twitter, LinkedIn templates. Browser-only.

CSS Border Radius Generator — Custom Corner Shapes Free

Generate CSS border-radius with per-corner control + elliptical radii for organic shapes. Live preview, presets, copy-paste ready.

CSS Box Shadow Generator — Soft, Inset & Layered Shadows

Generate CSS box-shadow with x/y offset, blur, spread, color, and inset toggle. Multi-layer shadows for realistic depth. Copy-paste ready.

Color Mixer Online — Blend Two Colors, Free

Mix two colors at any ratio. RGB, HSL, LAB blending. Generate the full gradient. Browser-only — no signup.

Color Palette Generator (Advanced) — Harmony, WCAG, Export

Build color palettes with harmony rules (complementary, triadic, tetradic, analogous), WCAG contrast checking, and export to CSS, SCSS, Tailwind, JSON.

Color Palette Generator — Build 5-Color Brand Palettes Visually

Generate harmonious 5-colour palettes by harmony rule (analogous, complementary, triadic). Export hex, CSS, Tailwind, ASE.

Color Shades Generator — Tints, Shades & Tonal Scales Free

Generate tints (lighter) and shades (darker) of any color, plus full Tailwind-style tonal scales (50–900). HSL + OKLCH. Free.

Credit Card Number Generator — Luhn-Valid Test Numbers (Free)

Generate Luhn-valid test credit card numbers for Visa, Mastercard, Amex, Discover. For development and testing only. Free.

Cron Expression Generator & Tester — Build, Decode, Preview Schedules

Build cron expressions visually or decode existing ones to plain English. Previews next 10 run times. Supports standard 5-field and 6-field formats.

CSS Background Pattern Generator — 50+ Free Patterns

Generate seamless CSS background patterns (dots, stripes, grid, checkerboard, waves) with adjustable size, color, and opacity. Pure CSS, no images.

CSS Border Radius Generator — Visual, Free Online

Build CSS border-radius values visually. Symmetric, asymmetric, organic blob shapes. Browser-only.

CSS Box-Shadow Generator — Visual Shadow Builder with Live Preview

Build CSS box-shadows with offset, blur, spread, colour, and inner glow. Stack multiple shadows. Live preview. Copy CSS or Tailwind.

CSS Checkbox Generator — Custom Styled, Accessible, Free

Build custom-styled checkboxes with pure CSS. Animations, colors, sizes. Accessible markup. Browser-only — no signup.

CSS Clip-Path Generator — Visual Polygon, Circle, Inset Builder

Visually build CSS clip-path: polygon, circle, ellipse, inset. Drag points on the preview. Copy CSS. Free, no signup.

CSS Cubic-Bezier Generator — Visual Easing Curve Editor

Build CSS cubic-bezier easing curves visually. Compare against ease-in-out, spring, bounce. Live animation preview. Free.

CSS Glassmorphism Generator — Frosted Glass Effect Free

Generate frosted-glass (glassmorphism) CSS with adjustable blur, opacity, border, and saturation. Live preview, copy-paste ready.

CSS Gradient Generator — Linear, Radial, Conic with Live Preview

Build CSS gradients visually — linear, radial, conic. Multi-stop colors, custom angles, presets. Copies modern CSS syntax. Free.

CSS Loader Generator — Spinners & Skeletons (Free)

Generate pure-CSS loading spinners, dots, bars, and skeleton shimmers. No SVG, no images. Adjustable color, size, speed. Copy-paste ready.

CSS Switch Generator — Toggle Switch Builder, Free

Build accessible toggle switches with pure CSS. Like iOS / Android. Custom colors, sizes, animations. Browser-only.

CSS Text Glitch Generator — RGB Split, Animated, Free

Add an animated glitch effect to text using pure CSS. RGB split, jitter, scanlines. No JS. Browser-only.

CSS Triangle Generator — Pure-CSS Arrows & Tooltips (Free)

Generate pure-CSS triangles (up/down/left/right + diagonals) for tooltips, dropdowns, and chat bubble tails. Adjust direction, size, color.

Dendrite Fractal Generator — Free Online, Browser

Generate dendrite fractals — branching crystal-like patterns. Customize parameters. Browser-only.

Dummy Data Generator — Names, Emails, CSV, JSON, Free

Generate realistic test data: names, emails, addresses, phone numbers, dates. Output CSV or JSON. Browser-only — no upload, no signup.

Email Template Generator — Responsive HTML, Free

Generate responsive HTML email templates that render in Gmail, Outlook, Apple Mail. Drag-build header/body/CTA/footer. Browser-only.

Fake Data Generator — Names, Emails, Addresses, JSON, CSV, SQL

Generate realistic fake data: names, emails, phones, addresses, companies, dates. Export as JSON, CSV, or SQL inserts. Free.

Fake IBAN Generator — Test Data, Format-Valid, Free

Generate format-valid IBANs for testing. Country-specific, MOD-97 checksum-correct. NEVER real accounts. Browser-only.

Fractal Tree Generator — SVG Trees Online, Free

Generate fractal trees with custom branch angles, depth, and colors. Export as SVG. Browser-only — no signup.

Gradient Generator — Linear, Radial, Conic CSS Gradients

Build linear, radial, conic CSS gradients with multi-stop colour control and live preview. Copy CSS or Tailwind. Free, no signup.

Hashtag Generator — Niche-Aware Hashtag Suggestions for Social

Generate niche-relevant hashtags for Instagram, TikTok, X, LinkedIn. Mix popularity tiers. Copy in one click. Free, no signup.

Hilbert Curve Generator — Space-Filling Fractal, Free

Generate Hilbert space-filling curves at any order. Visualize how 1D maps to 2D. Export SVG. Browser-only.

htaccess Generator — Redirects, HTTPS, Caching, Free

Generate Apache .htaccess rules for redirects, HTTPS, GZIP, caching, hotlink protection, password gates. Browser-only — no signup.

Invoice Generator — Free PDF Invoices for Freelancers & Small Biz

Create professional PDF invoices with your logo, line items, taxes, and discounts. Multi-currency. Free, in-browser, no signup.

MAC Address Generator — Random Unicast / Locally-Administered

Generate random MAC addresses (unicast / multicast, locally-administered). Multiple formats. Bulk export. Free, in-browser.

Meta Tag Generator — SEO + Social + Mobile Tags Free

Generate complete <head> meta tags: title, description, robots, canonical, viewport, theme-color, OG, Twitter, manifest. Copy-paste ready.

Mock API Generator — Free Fake REST Endpoint Builder

Build mock JSON responses for REST endpoints. Define schema, generate realistic data, copy as JSON. Browser-only — no signup, no server.

Number Sequence Generator — Range, Step, Free

Generate number sequences: arithmetic, geometric, Fibonacci, primes. Output as list, CSV, JSON. Browser-only.

Open Graph Meta Tag Generator — OG Tags for Social Sharing

Generate Open Graph + Twitter Card meta tags for rich social sharing previews. Live preview for Facebook, LinkedIn, Twitter/X. Free, instant.

Password Generator — Safe for Filenames, URLs, WhatsApp & Shells

Generate 56-character passwords that survive filenames, database URLs, terminals, spreadsheets and chat apps. 30 service presets. Runs offline in your browser.

Pythagoras Tree Fractal — SVG Generator, Free

Generate the Pythagoras tree fractal — recursive squares forming a tree. Customize angle, depth. Browser-only.

Random Color Generator — Hex / RGB / HSL with Tone Filters

Generate random colours: hex, RGB, HSL. Filter by tone (pastel, vibrant, dark, muted). Bulk export. Free, in-browser.

Random Number Generator — Integer & Decimal, Custom Ranges, Bulk

Generate random integers or decimals in any range. Bulk output up to 10,000 numbers. Crypto-strong RNG. Free, in-browser, no signup.

Random String Generator — Hex, Alphanumeric, Custom Charsets

Generate random strings: hex, alphanumeric, custom charsets, prefixed, length 1–4096. Bulk export. Crypto-strong RNG. Free.

React Native Shadow Generator — iOS + Android, Free

Generate cross-platform React Native shadow code. Handles iOS shadow* and Android elevation. Visual preview included.

Regex Builder — Visually Compose Regular Expressions

Build regular expressions visually: choose patterns from a palette, preview matches live, and export to JS/Python/PHP. Free.

Robots.txt Generator — Free with AI-Bot Allowlist

Generate a valid robots.txt with crawler allow/deny rules, sitemap directive, and AI-bot allowlist (GPTBot, ClaudeBot, PerplexityBot). Free.

Safe App Identifier Generator — Reverse-DNS, Free

Generate valid app IDs (com.company.app) for Android, iOS, Capacitor. Strict naming rules enforced. Browser-only.

Safe File Name Generator — Cross-Platform, Free

Convert any text to a safe file name across Windows, macOS, Linux, S3, URLs. Strip illegal chars, normalize case. Browser-only.

Safe Folder Name Generator — Cross-Platform, Free

Generate folder names safe across Windows, macOS, Linux. Strip illegal chars, normalize spacing. Browser-only.

Schema Markup Generator — JSON-LD Structured Data Free

Generate JSON-LD structured data for Article, FAQ, HowTo, Product, Organization, Recipe, Event, LocalBusiness, and more. Copy-paste ready.

Sierpinski Triangle Generator — SVG Fractal, Free

Generate the Sierpinski Triangle to any depth. Famous self-similar fractal, exported as SVG. Browser-only.

Sitemap.xml Generator — Free XML Sitemap Builder

Generate valid sitemap.xml for Google Search Console with URL list, lastmod dates, priority, and changefreq. Free, no signup, instant download.

SQL Query Generator — From Schema to SELECT, Free

Generate SQL SELECT, INSERT, UPDATE, DELETE statements from a table schema. Picks correct dialect: MySQL, Postgres, SQLite, MSSQL. Free.

String Generator — Random Strings, Custom Charsets, Free

Generate random strings with configurable length, charset, count. UUIDs, IDs, tokens, test data. Browser-only.

SVG Blob Generator — Random Organic Shapes Free

Generate random organic SVG blob shapes for backgrounds and decorative elements. Adjustable complexity, randomness, color. Copy-paste SVG.

SVG Pattern Generator — Seamless Tileable Patterns Free

Generate seamless tileable SVG patterns (geometric, dots, lines, shapes). Adjustable scale, color, opacity. Copy-paste ready, infinitely scalable.

Table Generator — HTML, Markdown, CSV, ASCII, Free

Build tables in any format: HTML, Markdown, CSV, ASCII, LaTeX. Set rows/cols, paste data, export. Browser-only.

Twitter Card Generator — Meta Tags, Preview, Free

Generate Twitter Card meta tags (summary, summary_large_image, app, player). Preview before publishing. Browser-only — no signup.

URL Slug Generator — SEO-Friendly Slugs from Any Title (Free)

Convert article titles to clean URL slugs. Strips accents, removes punctuation, lowercases, kebab-cases. Multi-language. Free, instant.

UUID Generator — v1, v4, v7, NIL (RFC 9562 Compliant)

Generate UUIDs (v1, v4, v7) in bulk. Cryptographically random, RFC 9562 compliant. Copy single or batch up to 10,000. Free, client-side.

Growth tools — ZTools

Browse ZTools Growth Suite tools for SEO, analytics, and AI. Sign-in and plan limits apply.

Analytics Chat — Ask About Supplied Data

Ask about a connected GA4 report or analytics data you paste. Choose shared AI or your own provider key to explain what the supplied data shows.

AI Article Writer — Outline, Draft, Polish

Build an outline, draft, and polish pass with shared AI or your own provider key. Review every claim before publishing.

AI Brand Visibility — Compare Brand Answers

Ask about your brand through ZTools' shared AI option or providers you connect. Compare the answers you actually receive; sources appear only when returned.

GA4 Mastery — Three Preset Reports with AI

Choose one of three preset GA4 reports for top pages, acquisition, or device and browser activity. Shared AI or your own key explains the data.

GSC Mastery — Three Search Console Reports

Review Search Console's top queries, page performance, or country breakdown for the last 28 days with a written AI explanation.

Keyword Research — Long-Tail Ideas from Google Suggest

Expand a seed keyword into ideas from Google Suggest. The results show phrasing, not verified search volume or ranking difficulty.

Page Speed Scan — Lighthouse Results by URL

Run Google PageSpeed Insights for a public URL on mobile or desktop. Review Lighthouse results and a list of opportunities.

AI Visibility Tracking — Count Pixel Requests

Add a tracking pixel to a site and review counted requests grouped by reported crawler user agent. The counts are a partial signal.

Website SEO, AEO & GEO Audit — Three Scores, One Report

Audit a public URL or pasted HTML for SEO, answer-ready structure, and generative-search signals. Review three directional scores and suggested changes.

Health tools — ZTools

Browse ZTools health tools, with use cases and examples for each one.

Blood Alcohol Calculator — Estimate BAC from Drinks (Widmark)

Estimate blood alcohol concentration (BAC) using the Widmark formula. Educational only — never use to decide if safe to drive.

BMR Calculator — Basal Metabolic Rate (Mifflin-St Jeor Equation)

Estimate your basal metabolic rate (BMR) — calories burned at complete rest. Mifflin-St Jeor + Katch-McArdle. Free.

Body Fat Calculator — US Navy Method, BMI Method, Skinfolds

Estimate body fat percentage with US Navy circumference method, BMI method, or skinfold inputs. Free, in-browser.

Calorie Calculator — Daily Calorie Needs by Goal & Activity

Calculate daily calorie needs based on age, sex, weight, height, activity level, and goal (lose, maintain, gain). Free.

Child Growth Percentile Calculator (WHO, 0–5 Years)

Estimate a child’s weight-for-age and height-for-age percentiles (0–5 years) using simplified WHO growth standards. Free, in-browser, boys and girls.

Contraction Timer with 5-1-1 Rule Alert (Free, Private)

Time labor contractions with one tap — track each duration and interval, see rolling averages, and get a 5-1-1 alert. Free, in-browser, saved locally.

Heart Rate Zone Calculator — Target Zones for Cardio Training

Calculate heart rate training zones (Z1–Z5) using max-HR and Karvonen (HRR) methods. Free, in-browser.

Ideal Weight Calculator — Devine, Robinson, Hamwi, BMI-based

Estimate ideal body weight using Devine, Robinson, Hamwi, Miller, and BMI-based formulas. Compare side-by-side. Free.

Intermittent Fasting Timer — Track 16:8, 18:6, 20:4, OMAD Windows

Track intermittent fasting windows: 16:8, 18:6, 20:4, OMAD, 24h. Live timer, stage milestones. Free, in-browser.

Macronutrient Calculator — Protein, Carbs, Fat from Calories & Goals

Calculate daily protein, carbs, and fat targets from calorie intake and goal (cut, maintain, bulk). Free, in-browser.

Meal Planner Online — Weekly Plan, Free, Browser-Only

Plan meals for the week. Add recipes, generate shopping list, track macros. Browser-only — no signup.

One-Rep Max Calculator — Estimate 1RM from Sub-Maximal Lifts

Estimate one-rep max (1RM) from any rep × weight set using Epley, Brzycki, Lombardi, O'Conner, Wathan formulas. Free.

Ovulation Calculator — Fertile Window from Cycle Length & LMP

Estimate ovulation day and fertile window from cycle length and last period start. Free, in-browser, no signup.

Pregnancy Due Date Calculator — Naegele's Rule + Conception Date

Calculate pregnancy due date by last menstrual period (Naegele's rule) or conception date. Free, in-browser.

Pregnancy Weight Gain Calculator (IOM 2009 Guidelines)

Find your recommended pregnancy weight-gain range from pre-pregnancy BMI using IOM 2009 guidelines, for singleton or twin pregnancies. Free, in-browser.

Protein Intake Calculator — Daily Target, Free

Calculate daily protein need from weight, age, activity level, goal. Evidence-based ranges. Browser-only.

Running Pace Calculator — Pace, Time, Distance Conversions

Compute running pace, finish time, or distance from any two of the three. min/km, min/mi, mph. Splits table. Free.

Sleep Cycle Calculator — Wake Up Refreshed at Cycle Boundaries

Calculate optimal bedtimes / wake times based on 90-minute sleep cycles. Wake at cycle ends to feel refreshed. Free.

TDEE Calculator — Total Daily Energy Expenditure with Activity Detail

Calculate Total Daily Energy Expenditure (TDEE) with detailed activity breakdown: steps, workouts, NEAT. Free, in-browser.

Waist-to-Hip Ratio Calculator — WHR & WHO Risk Bands

Calculate your waist-to-hip ratio (WHR) in cm or inches and see the WHO cardiovascular-risk band for men and women. Free, in-browser, no sign-up.

Water Intake Calculator — Daily Hydration Target by Body & Activity

Calculate daily water intake based on body weight, activity, climate, and pregnancy/breastfeeding. Free, in-browser.

Workout Timer Online — HIIT, Tabata, Free, Browser

Free interval timer for HIIT, Tabata, circuit training. Custom rounds, work / rest. Audio cues. Browser-only.

Image tools — ZTools

Browse ZTools image tools, with use cases and examples for each one.

Add Border to JPG — Custom Color, Width, Free Online

Add a solid or styled border around any JPG. Pick color, width, style. Browser-only — no upload, no signup.

Add Text to GIF — Caption, Meme, Subtitle, Free

Overlay text on any GIF — captions, memes, subtitles. Pick font, color, position. Browser-only — no upload.

Background Remover — Cut Out Photo Backgrounds with AI, Free

Remove the background from a photo with AI and download a full-size transparent PNG. Free with a Google sign-in; your photo is deleted right after processing.

Base64 to Image — Decode Data URLs and Base64 Strings to PNG/JPG

Paste a Base64 string or a data: URL and download the decoded image. Detects PNG, JPG, GIF, WebP, SVG. Free, in-browser, instant.

Blur Image — Free Online Tool for Gaussian, Box, and Selective Blur

Blur a whole image or a specific region (face, plate, signature). Gaussian, box, motion, pixelate. Adjustable intensity. Free, in-browser.

Cartoon Effect Generator — Free Photo to Cartoon Online

Convert photos to cartoon-style images using edge detection + color quantization. Browser-only Canvas, no AI service costs, free.

Change GIF Speed — Faster, Slower, Frame Delay, Free

Speed up or slow down any GIF by adjusting frame delays. Preview live. Browser-only — no upload, no signup.

Change JPG Quality Online — Free Browser Compressor

Re-save JPG with custom quality (1-100) to shrink file size. Visual preview before download. Browser-only — no upload.

Change PNG Colors Online — Replace, Recolor, Free

Replace a color in a PNG with another. Pick by eyedropper, set tolerance. Preserves transparency. Browser-only.

Color Picker — HEX, RGB, HSL, OKLCH (Visual & Eyedropper)

Pick colors visually, get HEX, RGB, HSL, OKLCH, CMYK values. Eyedropper, palette saving, contrast checker. Designer-grade, free.

Convert PNG to WebP — Free Online, Browser-Only

Convert PNG images to WebP for ~30% smaller files at the same visual quality. Browser-only — no upload, no signup.

Convert WebP to PNG — Free Online, Browser-Only

Convert WebP images to PNG for compatibility with older tools, social platforms, and apps that reject WebP. Browser-only.

Crop WebP Online — Free, Pixel-Perfect, Browser-Only

Crop any WebP image to a custom rectangle, aspect ratio, or fixed size. Preserves transparency. Browser-only.

Duplicate Image Finder — Find Exact and Similar Photos in a Folder

Find exact and visually similar duplicate images in a folder. Perceptual hashing detects rotated, resized, recompressed copies. Free, in-browser.

Extract GIF Frames — Save as PNG / JPG, Free

Extract every frame of a GIF as separate PNG or JPG images. Download as ZIP. Browser-only — no upload.

Favicon Generator — Create Multi-Size Favicons (ICO, PNG, Apple Touch)

Generate favicons in every size browsers and platforms need: 16x16, 32x32, 192x192, 512x512, apple-touch-icon, and ICO. From any image, free.

Convert JPG to Grayscale — Black & White, Free

Convert any JPG to grayscale using luminance, average, or desaturation. Browser-only — no upload, no signup.

HEIC Converter — Convert iPhone HEIC Photos to JPG/PNG/WebP

Convert HEIC and HEIF photos from iPhone or iPad to JPG, PNG, or WebP. Batch-friendly. 100% in-browser. No upload, no signup.

Image Average Color Finder — Hex, RGB, HSL, Free

Find the average color of any image. Hex, RGB, HSL output. Useful for placeholder colors, theming. Browser-only.

Image to Base64 Encoder — Embed Images in CSS, HTML, JSON

Convert images to base64 data URIs for inline embedding in CSS, HTML, JSON, or markdown. Bidirectional — also decodes base64 back to image.

Image Border Tool — Add Borders & Frames to Photos Free

Add solid, gradient, or polaroid-style borders to photos. Custom width, color, and corner radius. Browser-only, no upload, free.

Image Color Extractor — Pull a Palette from Any Photo

Extract the dominant colour palette from any image. 5–20 swatches with hex, RGB, HSL. Free, in-browser, designer-friendly.

Image Compressor — Reduce JPG, PNG, WebP Size (Lossless & Lossy)

Compress JPG, PNG, WebP images in your browser. Lossless or quality-controlled lossy. Reduce 60–90%. No upload, no signup.

Image Cropper — Crop JPG, PNG, WebP to Any Aspect Ratio (Free)

Crop images to exact dimensions or preset aspect ratios (1:1, 4:3, 16:9, custom). Pixel-perfect, in-browser, no upload, no watermark.

Image Filters & Effects — Free Browser Photo Editor

Apply 30+ filters and effects to photos: brightness, contrast, saturation, sepia, blur, vignette, grain. Browser-only Canvas. Free, no upload.

Image Filters — Apply Instagram-style Filters to Photos (Free)

Apply photo filters: vintage, B&W, sepia, warm, cold, dramatic, fade, vignette, grain. Live preview. Free, in-browser, no signup.

Batch Image Format Converter — JPG, PNG, WebP, AVIF (Free)

Convert multiple images at once between JPG, PNG, WebP, AVIF, GIF. Drop a folder, get a ZIP. Browser-only — no upload, no watermark.

Image Metadata Viewer & Remover — EXIF, GPS, IPTC (No Upload)

View every EXIF, GPS, IPTC and XMP tag embedded in a JPG, PNG or HEIC, then download a clean copy with all metadata stripped. 100% in your browser — no upload.

Image Resizer — Resize JPG, PNG, WebP Online (Pixel-Perfect, Free)

Resize images to exact dimensions or by percentage. Maintains aspect ratio, supports JPG, PNG, WebP. 100% client-side — no upload, no watermark.

Image Rotate and Flip — Rotate 90°/180°, Flip Horizontal/Vertical

Rotate images by 90°, 180°, 270°, or any custom angle. Flip horizontal and vertical. Lossless for 90° steps. Free, in-browser.

Image Steganography — Hide Secret Text Inside a PNG (In-Browser)

Hide a secret message inside a PNG image, or reveal one, using LSB steganography. Runs entirely in your browser — nothing is uploaded. Optional passphrase obfuscation.

Image Upscaler — Enlarge Photos 2x/4x, with AI Upscaling on Our Server

Enlarge images 2x, 3x or 4x with smooth interpolation in your browser, or with Real-ESRGAN AI upscaling on our server (free Google sign-in). PNG, JPG or WebP output.

Image Watermark — Add Text or Logo Watermark to Photos (Free)

Add text or logo watermark to any photo. Adjust position, opacity, rotation, repeat. Batch-friendly. Free, in-browser, no upload.

Instagram Filters Advanced — Replicate Classic IG Looks

Apply Instagram-style filters (Clarendon, Gingham, Lark, Juno, Ludwig) to any photo. Browser-only Canvas, no upload, free.

Instagram Post Generator — Free Quote, Carousel & Card Maker

Build Instagram-ready post graphics: quote cards, carousel slides, info graphics. Templates, fonts, brand colors. Free, browser-only.

Passport Photo Maker — Free, Compliant, Print-Ready

Create compliant passport / visa / ID photos online. Auto-crop to country specs, plain background, print-ready 4×6 layout. Free.

Photo Censor Tool — Blur or Pixelate Faces, Free

Censor sensitive parts of photos with blur, pixelation, or solid blocks. Drag-rectangle UI. Browser-only.

Photo Collage Maker Advanced — Free Grid + Custom Layouts

Build photo collages with grid, mosaic, freeform, magazine, polaroid layouts. Drag-drop, custom borders, captions, export PNG. Free.

Pixelate Image — Free Online Pixelator (Privacy + 8-Bit)

Pixelate any image to redact faces, sensitive data, or create 8-bit retro art. Adjustable block size. Browser-only, free, no upload.

Pixelate JPG — Censor Faces, Mosaic Effect, Free

Pixelate any region or whole image. Censor faces, license plates, sensitive info. Browser-only — no upload.

Pixelate WebP — Censor, Mosaic Effect, Free

Pixelate WebP images. Censor faces, license plates, sensitive info. Browser-only — no upload.

Remove GIF Background — Free Online, Browser-Only

Remove the background from animated GIFs frame by frame. Color-key based. Browser-only — no upload.

Remove WebP Background — Free Online, Browser-Only

Remove the background from any WebP image. Color-key based. Browser-only — no upload.

Replace WebP Colors — Free Online, Browser-Only

Replace one color with another in any WebP image. Eyedropper, tolerance, transparency support. Browser-only.

Reverse GIF Online — Play Backwards, Free

Reverse any GIF so it plays end-to-start. Optional ping-pong (forward then backward). Browser-only.

Reverse Image Search — Find Image Source on Google, Bing, Yandex

Reverse-search any image across Google Images, Bing Visual, Yandex Images, TinEye in one click. No upload needed for URL input. Free.

Rotate PNG Online — 90, 180, 270, Custom, Free

Rotate PNG images 90, 180, 270, or any custom angle. Preserves transparency. Browser-only — no upload, no signup.

Sharpen Image — Unsharp Mask and Smart Sharpen Online (Free)

Sharpen photos with unsharp mask or smart sharpen. Adjustable amount, radius, threshold. Edge-aware. Free, in-browser, no signup.

Smart Image Optimizer — Auto Format + Size for Web (Free)

Auto-pick best format (AVIF/WebP/JPG), dimensions, and quality for web use. Drop image, get optimized output. Browser-only, free.

Social Media Image Resizer — All Platforms, One Click

Resize a single image to all social platform sizes: Instagram, Facebook, Twitter, LinkedIn, YouTube, TikTok, Pinterest. Free, no upload.

SVG Optimizer — Minify, Clean, Shrink SVG Files (SVGO-Powered)

Optimize SVG files — strip metadata, collapse paths, remove hidden elements. Typically 40-70% size reduction with no visual change. Free.

SVG to PNG Converter — Render Vector to Raster at Any Size

Convert SVG to PNG at any resolution. 1x, 2x, 4x exports. Transparent or coloured background. Free, in-browser, batch-friendly.

Make JPG Transparent — Replace White with Alpha, Free

JPG can't hold transparency natively — convert to PNG with the white background made transparent. Free, browser-only.

Transparent PNG Maker — Make Image Backgrounds Transparent (Free)

Make any solid colour background transparent. Magic-wand colour key for logos and screenshots. Free, in-browser, no signup, no watermark.

Make WebP Transparent — Replace Color with Alpha, Free

Replace a solid color in a WebP with transparency. Eyedropper, tolerance. Browser-only.

Tweet Generator — Free Fake Tweet Image Maker

Generate realistic fake tweet images for memes, mockups, and presentations. Customisable handle, content, likes, retweets, light/dark mode.

Tweet to Image Converter — Save X Posts as PNG (Free)

Convert any X/Twitter post URL or pasted content to a clean shareable image. Optimised for cross-platform repost. Free, no login.

Universal Image Converter — JPG, PNG, WebP, AVIF, GIF, BMP, TIFF

Convert any image to any image format. JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO, HEIC and more. Batch-friendly, in-browser, free.

Vimeo Thumbnail Grabber — Free Online, Browser

Get the thumbnail image from any public Vimeo video. Multiple resolutions. Browser-only — no signup.

YouTube Thumbnail Grabber — Download Thumbnails in HD/SD

Grab any YouTube video thumbnail at HD (1280x720), SD (640x480), and lower resolutions. Paste a URL, download in one click. Free.

Legal tools — ZTools

Browse ZTools legal tools, with use cases and examples for each one.

Bill of Sale Generator — Free Printable Template Maker

Generate a printable bill of sale from parties, item, price, and date — sell a car, boat, or equipment as-is or with a warranty. Free, in-browser template.

Contract Template Generator — Free, Browser-Only

Generate contract templates: NDAs, service agreements, freelance contracts. Plain-English, customizable.

Cookie Policy Generator — GDPR / ePrivacy Cookie Notice

Generate a cookie policy + banner template covering GDPR / ePrivacy / CCPA cookies. Free, in-browser.

Disclaimer Generator — Website / Content Disclaimers

Generate disclaimers for blogs, affiliate links, medical / legal content. Customisable, free. NOT legal advice.

EULA Generator — End User License Agreement Template

Generate a starter EULA (End User License Agreement) for software apps. Customisable. NOT legal advice.

LLC Operating Agreement Generator — Single or Multi-Member

Assemble a basic single- or multi-member LLC operating agreement from your company and member details — member- or manager-managed. Not legal advice.

Power of Attorney Generator — General, Limited, Durable

Assemble a general or limited (special) power of attorney naming a principal and agent, with an optional durability clause. A template — not legal advice.

Privacy Policy Generator — GDPR, CCPA, COPPA Templates

Generate a starter privacy policy template covering GDPR, CCPA basics. Free, customisable, NOT legal advice.

Return / Refund Policy Generator — Free, Customizable

Generate a return / refund policy for your e-commerce store. Multiple jurisdictions. Browser-only.

Terms of Service Generator — Free Starter ToS Template

Generate a starter Terms of Service / Terms & Conditions template for websites and apps. NOT legal advice.

Math tools — ZTools

Browse ZTools math tools, with use cases and examples for each one.

Add Commas to Numbers — Thousands Separators, Free

Format numbers with thousand separators (1,000 / 1.000 / 10,00,000). Multi-locale support. Browser-only.

BMI Calculator — Body Mass Index in Metric & Imperial (Free)

Calculate your Body Mass Index in metric (kg/cm) or imperial (lb/in) and see your WHO category — underweight, normal, overweight, obese. Free.

Online Calculator — Scientific & Basic Math, Free Browser Calculator

Free online calculator. Basic arithmetic plus scientific functions: sin/cos/tan, log, ln, exponents, square root, parentheses. Works offline.

Compound Interest Calculator — Future Value, Monthly Compounding (Free)

Project investment growth with compound interest. Monthly contributions, custom compounding frequency, year-by-year breakdown. Free.

Discount Calculator — Sale Price, Savings, Stacked Coupons (Free)

Calculate sale prices, % off, and savings instantly. Stack coupons, factor in tax, see the "real" final price. Free shopping calculator.

Enumerate Integers — Generate Sequence in Range, Free

List every integer in a range. Configurable step, format, separator. Browser-only — no signup.

Equation Grapher — Plot Functions Online, Free

Graph y = f(x) equations. Plot multiple functions, customize range and grid, export as SVG. Browser-only.

Math Expression Evaluator — Free, Browser-Only

Evaluate any math expression with parentheses, operators, functions, variables. Like a programmable calculator. Browser-only.

Factorial Calculator — n!, Double Factorial, Subfactorial

Calculate n!, double factorial n!!, subfactorial !n and primorial n# with step-by-step working and arbitrary-precision results.

Fibonacci Sequence Generator — Nth Term & Series (Free)

Generate the Fibonacci sequence to any length, find the nth Fibonacci number, and see the golden ratio convergence. Free, fast.

Fraction Calculator — Add, Subtract, Multiply, Divide & Simplify (Free)

Calculate with fractions: add, subtract, multiply, divide, simplify, and convert to decimal. Mixed numbers supported. Free, instant.

GCD & LCM Calculator — Greatest Common Divisor, Least Common Multiple (Free)

Find GCD and LCM of two or more integers using the Euclidean algorithm. Shows step-by-step work and prime factorization. Free.

Increment Digits Online — Free, Browser-Only

Increment every digit in a number by 1. 12345 → 23456. Useful for puzzles and tests. Browser-only.

Generate Integer Pairs — Cartesian, Range, Free

Generate all (i, j) integer pairs in a range. Cartesian product, ordered, distinct. Browser-only.

L-System Generator — Lindenmayer Fractals, Free

Generate L-system fractals. Define rules, iterate, render. Trees, snowflakes, dragon curves. Browser-only.

Look and Say Sequence Generator — Free, Browser

Generate the look-and-say sequence (Conway). 1, 11, 21, 1211, 111221... Browser-only.

Matrix Calculator — Add, Multiply, Inverse, Transpose, Free

Add, subtract, multiply matrices. Compute inverse, transpose, determinant, rank. Up to 10×10. Browser-only.

Mortgage Calculator — Monthly Payment, Interest & Amortization (Free)

Calculate monthly mortgage payment from loan amount, rate, and term. See total interest, payoff date, and full amortization schedule. Free.

Number Formatter — Currency, Percent, Scientific, Free

Format numbers as currency ($1,234.56), percent (12.5%), scientific (1.5E+06), or custom. Multi-locale. Browser-only.

Sum Numbers Online — Add a List, Free, Browser-Only

Sum a list of numbers instantly. Handles decimals, negatives, scientific notation. Plus running total. No upload.

Numbers to Words Converter — Free, Multi-Language

Convert 242 to "two hundred forty-two" for cheques, invoices, contracts. English, Spanish, French. Browser-only.

Pascal Triangle Generator — N Rows Online, Free

Generate Pascal's Triangle to N rows. Highlight binomial coefficients, Fibonacci diagonals, free.

Percentage Calculator — Find %, Increase, Decrease & Change (Free)

Calculate any percentage in one click — what is X% of Y, X is what % of Y, percentage increase, decrease, and change. Shows the formula. Free.

Pi Digits — First 10000 Digits Online, Free

Show the first N digits of Pi (π). Up to 10,000 digits. Search for substrings. Browser-only — no signup.

Prime Number Checker — Test Primality & Factor Composites (Free)

Test whether any number is prime, and if not, see its prime factorization. Handles numbers up to 10^15 with Miller-Rabin. Free.

Pythagorean Theorem Calculator — Find a, b, or c (Hypotenuse) (Free)

Solve right triangles using a² + b² = c². Find the hypotenuse or a missing leg. Shows the work, supports any units. Free.

Random Matrix Generator — Configurable, Free Online

Generate random matrices of any size with custom value range, integer or float, sparsity. Browser-only.

Reverse Digits Online — Flip Numbers, Free

Reverse the digits of any number: 12345 → 54321. Handles decimals, negatives. Browser-only.

Roman Numeral Converter — Numbers to Roman & Roman to Numbers (Free)

Convert numbers to Roman numerals and Roman numerals to Arabic. Up to 3,999,999 with vinculum notation. Free, instant.

Salary Calculator — Hourly to Annual, Take-Home Pay (Free)

Convert hourly to annual or vice-versa. Calculate weekly, biweekly, and monthly pay. Estimate take-home with tax. Free.

Sort Numbers Online — Ascending, Descending, Free

Sort any list of numbers ascending or descending. Handles decimals, negatives, scientific notation. Browser-only.

Statistics Calculator — Mean, Median, Mode, Standard Deviation (Free)

Compute mean, median, mode, range, variance, standard deviation, and quartiles for any dataset. Paste numbers, get full summary. Free.

Statistics Calculator — Mean, Median, SD, Free Online

Compute mean, median, mode, range, variance, standard deviation, quartiles, and percentiles for any list of numbers. Browser-only.

Tip Calculator — Split Bills, Custom Tip %, Per-Person Total (Free)

Calculate restaurant tip and split the bill across any group size. Custom tip percentages, rounding, per-person totals. Free, instant.

Words to Numbers Converter — Free Online, Multi-Language

Convert "two hundred forty-two" to 242. Handles English, Spanish, French. Useful for parsing forms and OCR output.

Media tools — ZTools

Browse ZTools media tools, with use cases and examples for each one.

Audio Cutter — Trim & Cut MP3 / WAV / OGG in Browser

Trim, cut, and split audio files visually in the browser. Drag handles on waveform, export MP3 / WAV. Free, no upload.

Audio Format Converter — MP3, WAV, OGG, FLAC, M4A

Convert audio to MP3, M4A, AAC, OGG, Opus, FLAC or WAV with a chosen bitrate on our server (free Google sign-in), or to WAV and WebM in your browser with no upload.

Audio Joiner — Merge Multiple Audio Files into One

Merge MP3 / WAV / OGG audio files into a single track. Drag-reorder, optional crossfades, free, browser-only.

Audio Noise Reducer — Remove Background Hiss & Hum

Reduce steady background noise (hiss, hum, fan) in audio files: a filter-and-gate chain in your browser, or a stronger FFT denoiser on our server (free Google sign-in).

GIF Maker — Build Animated GIFs from Images or Frames

Build animated GIFs from a sequence of images or recorded frames. Set FPS, loop, dimensions. Free, browser-only.

Image to Text OCR — Extract Text from Images Free

Extract text from photos, screenshots and scans with Tesseract OCR in 17 languages, including Urdu, Arabic and Hindi. Free with a Google sign-in; images are deleted right after.

QR Code Scanner — Decode QR Codes from Camera or Image

Scan QR codes via webcam or upload image. Decode URL, text, Wi-Fi, vCard. Free, browser-only, instant.

Screen Recorder — Record Tab, Window, or Full Screen Free

Browser screen recorder: capture tab, window, or full screen with optional mic + system audio. Download WebM, no upload.

Speech to Text — Live Dictation or File Transcription, Free

Dictate live with your browser's speech recognition, or transcribe audio and video files with Whisper on our server (free Google sign-in). Export text, SRT or VTT.

Video Compressor — Shrink Videos to MP4 (H.264), Free

Make a video smaller: re-encode it in your browser to WebM with no upload, or on our server to an H.264 MP4 that plays everywhere, much faster (free Google sign-in).

Video Subtitle Extractor — Extract or Generate SRT / VTT Subtitles

Pull the subtitle tracks out of an MKV or MP4, or generate subtitles from speech with Whisper, as SRT or VTT. Runs on our server (free Google sign-in); edit SRT/VTT files in your browser.

Video Thumbnail Generator — Extract Frame as Image

Extract frame from MP4 / WebM as JPG / PNG thumbnail. Pick exact timestamp, multiple frames. Free, in-browser.

Video to GIF — Convert MP4 to Animated GIF, Free

Turn a short part of an MP4, WebM or MOV video into an animated GIF. Pick the start, length, frame rate and width, in your browser or on our server for cleaner colours.

Voice Recorder — Browser Audio Capture, Free, MP3 / WebM

Record voice memos, interviews, podcasts in the browser. Pause, resume, download MP3 / WebM. No upload, no sign-up.

PDF tools — ZTools

Browse ZTools pdf tools, with use cases and examples for each one.

Compress PDF — Reduce PDF File Size, Keep Text Selectable (Free)

Shrink PDFs for email, web or upload limits: re-compress the images on our server with text kept selectable (free Google sign-in), or re-save or rasterise in your browser with no upload.

Delete PDF Pages — Remove Pages from a PDF (Free, In-Browser)

Delete one or more pages from a PDF. Visual page picker. Preserves quality. 100% in-browser — no upload, no watermark, no email.

Excel to PDF Converter — XLSX to PDF Preserving Layout (Free)

Convert Excel (.xlsx, .xls) to PDF with its formatting, charts and page setup on our server (free Google sign-in), or turn a sheet into a table PDF in your browser. No watermark.

Extract PDF Pages — Pull Specific Pages into a New PDF (Free)

Extract one or more pages from a PDF into a new file. Specify ranges (1-5, 8, 10-12). Preserves quality. No upload, no watermark.

Flatten PDF — Merge Annotations, Forms, Layers, Free

Flatten PDF annotations, form fields, and layers into static content. Browser-only — no upload.

Image to PDF — Combine JPG, PNG, WebP into One PDF (Free)

Combine multiple images into a single PDF. Reorder, rotate, set page size and orientation. 100% in-browser — no upload, no watermark.

Merge PDF — Combine Multiple PDFs Into One (Client-side)

Merge unlimited PDF files into one. Drag to reorder, preview pages. 100% in your browser via pdf-lib — no upload to any server.

Organize PDF — Reorder, Delete, Insert Pages, Free

Reorder, delete, rotate, and insert pages in any PDF. Visual page-grid UI. Browser-only.

PDF Bookmark Manager — Add, Remove, Edit, Free

Manage PDF bookmarks (table of contents). Add, remove, rearrange. Browser-only — no upload.

PDF Form Filler — Fill, Save, Free, Browser-Only

Fill PDF forms (text fields, checkboxes, dropdowns) in the browser. Save as filled PDF. No upload.

PDF OCR Text Extraction — Get Text from Scanned PDFs, Free

Extract text from scanned and typed PDFs: text layers are copied as-is, scanned pages are read with Tesseract OCR in 17 languages. Free with a Google sign-in; files deleted right after.

PDF Page Reorder — Drag-Drop, Free, Browser

Drag-and-drop reorder PDF pages. Simple, fast, browser-only — no signup required.

PDF Reader Online — View PDFs in Browser, Free

Open and read any PDF in the browser. Search, annotate, navigate, fullscreen. Browser-only — no upload.

PDF to Excel Converter — Extract Tables to XLSX (Free, In-Browser)

Extract tables from PDF into editable Excel (.xlsx) spreadsheets. Detects rows, columns, headers automatically. No upload, no watermark.

PDF to Image — Convert PDF Pages to JPG, PNG, WebP (Free, In-Browser)

Render every PDF page as a high-quality JPG, PNG, or WebP image. Choose DPI (72-600). Outputs a ZIP. No upload, no watermark.

PDF to Text Extractor — Free, Browser-Only

Extract plain text from any PDF. Preserves paragraph structure where possible. Browser-only — no upload.

PDF to Word Converter — Editable DOCX from PDF (Free, In-Browser)

Convert PDF to editable Microsoft Word (.docx) preserving text, headings, lists, and basic layout. No upload, no email required, no watermark.

Protect PDF — Add Password Protection to PDF Files (Free, In-Browser)

Add a password to a PDF. AES-256 encryption, restrict printing/copying/editing. 100% in-browser — your password and file never leave your device.

Rotate PDF — Fix Sideways or Upside-Down Pages (Free, In-Browser)

Rotate PDF pages 90°, 180°, or 270° — all pages or just selected pages. Permanent rotation saved in the file. No upload, no watermark.

Sign PDF — Add Signatures, Initials, Dates to PDF Forms (Free)

Add typed, drawn, or uploaded signatures to PDFs. Place initials, dates, and text fields. 100% in-browser — your signature never leaves your device.

Split PDF — Extract Pages or Break Files into Multiple PDFs (Free)

Split a PDF into multiple files by page range, every Nth page, or one PDF per page. 100% in-browser — no upload, no watermark, no email required.

Unlock PDF — Remove Password from PDF (You Must Know It) — Free

Remove password protection from PDFs you own and know the password to. Removes restrictions on printing, copying, editing. In-browser, no upload.

Watermark PDF — Add Text or Image Watermarks to PDFs (Free)

Add text or image watermarks to every PDF page — opacity, rotation, position, repeat. "DRAFT", "CONFIDENTIAL", logos. In-browser, no upload.

Word to PDF Converter — DOCX and DOC to PDF, Free

Convert Word (.docx, .doc) to PDF with the exact layout on our server (LibreOffice, free Google sign-in), or to a simplified PDF in your browser with no upload. No watermark.

Productivity tools — ZTools

Browse ZTools productivity tools, with use cases and examples for each one.

Checklist Maker — Reusable Checklists, Free, In-Browser

Build reusable checklists for routines, travel, projects. Save templates, check off items, share links. No sign-up.

Cover Letter Generator — Tailored Letters in Minutes

Generate a professional cover letter from job title, company, and 3 highlights. Customisable tone, free PDF export.

Daily Planner — Hour-by-Hour Schedule with Priorities

Plan your day hour-by-hour: schedule blocks, top-3 priorities, time tracking, evening review. Free, browser-only.

Decision Wheel Spinner — Random Picker for Tough Calls

Spin a wheel of options for random decisions: dinner, classroom picks, raffle. Custom segments, fair RNG, free.

Eisenhower Matrix Maker — Urgent vs Important Quadrants

Sort tasks into Eisenhower quadrants (Do / Schedule / Delegate / Drop). Drag-drop, persistent, free, browser-only.

Flowchart Maker — Process Diagrams in the Browser, Free

Draw process flowcharts with standard shapes (start, action, decision, end). Drag-and-drop, PNG / SVG export, no sign-up.

Goal Tracker — Track Progress on Annual & Quarterly Goals

Track quarterly + annual goals with progress %, milestones, weekly check-ins. Free, browser-only, persistent.

Habit Tracker — Daily Streaks, Visual Calendar, Free

Track daily habits with streaks, calendar grid view, completion %, and weekly review. No sign-up, browser-only.

Kanban Board — Drag-and-Drop Task Tracking, Free

Personal Kanban board with To Do / Doing / Done columns. Drag-drop cards, custom columns, no sign-up. Local-only.

Meeting Cost Calculator — Real-Time Cost of Your Meetings

Calculate the cost of a meeting from headcount, average salary, and duration. Live ticker. Free, browser-only.

Meeting Notes Generator — Structured Recap Templates, Free

Generate structured meeting notes: agenda, attendees, decisions, action items, next steps. Markdown export, free.

Mind Map Maker — Visual Brainstorming, Free, In-Browser

Create mind maps visually: central topic, branches, sub-branches, color coding. Export PNG / SVG. No sign-up.

Project Timeline Maker — Gantt-Style Charts in the Browser

Build project timelines: tasks, durations, dependencies, milestones. Gantt-style view, export PNG. Free, no sign-up.

Resume Builder — ATS-Friendly Resumes in Minutes, Free

Build a clean, ATS-friendly resume with sections for experience, education, skills. Live preview, PDF export, no sign-up.

SEO tools — ZTools

Browse ZTools seo tools, with use cases and examples for each one.

Alt Text Generator — Write SEO + Accessibility Alt Attributes (Free)

Generate descriptive alt text for images. Helps SEO + screen readers. Bulk mode, character-limit warnings, decorative-image detection. Free.

Breadcrumb Schema Generator — JSON-LD, Free

Generate BreadcrumbList JSON-LD schema for SEO. Multi-level paths, custom URLs. Browser-only.

Canonical URL Checker — Detect Wrong Canonicals, Self-Referential, Chains

Check the canonical URL of any page. Detects self-referential, cross-domain, redirected, missing, and chained canonicals. Free, instant.

Heading Structure Checker — Audit H1-H6 Hierarchy on Any Page (Free)

Audit any page's heading hierarchy (H1-H6). Detects multiple H1s, skipped levels, empty headings, missing structure. SEO + accessibility. Free.

Hreflang Tag Generator — Generate hreflang for Multilingual SEO (Free)

Generate hreflang tags for multi-language and multi-region sites. Validates ISO codes, mutual references, x-default. Copy as HTML, sitemap, or HTTP. Free.

Internal Link Analyzer — Free SEO Tool, Browser

Analyze internal links on a page. Count, classify, find orphan pages. Browser-only via paste / fetch.

Keyword Density Analyzer — Find Top Keywords + Phrases on Any Page

Analyze any URL or text for keyword density, top phrases, n-gram frequency, and stuffing risk. Stop-word filtering, multi-language support. Free.

Meta Tags Analyzer — Audit Title, Description, OG, Twitter Cards (Free)

Inspect every meta tag on any page — title, description, canonical, OG, Twitter, robots. Length warnings, missing tag flags, social-preview render. Free.

Mobile SEO Checker — Audit Mobile-Friendliness, Speed, Tap Targets

Audit mobile SEO — viewport meta, font sizes, tap-target spacing, image responsiveness, mobile speed signals. Mobile-first index ready. Free.

Open Graph Debugger — Test Facebook, LinkedIn, Slack Previews (Free)

Debug Open Graph tags. See exactly how Facebook, LinkedIn, Slack, Discord, and WhatsApp will render your link preview. Image-size warnings. Free.

Page Speed Analyzer — Core Web Vitals, Free

Analyze any page's speed: LCP, FID, CLS, TTFB. Browser-only via Performance API. No signup.

Redirect Chain Checker — Free Online, Browser

Check redirect chains for any URL. Detect redirect loops, slow hops. Browser-only — CORS permitting.

robots.txt Validator — Check Syntax, Test URLs, Catch Mistakes

Validate robots.txt syntax, test if specific URLs are allowed for each user-agent, and catch the disasters (Disallow: /). Free, in-browser.

SEO Checker — Audit Any URL for On-Page SEO Issues (Free)

Run a complete on-page SEO audit on any URL — title, meta, headings, images, links, schema, mobile, speed. Prioritized fix list. Free.

SEO Content Analyzer — Free On-Page Audit, Browser

Audit content for SEO: word count, readability, heading structure, keyword density. Browser-only.

SEO Score Calculator — Quantify On-Page SEO Health (0-100, Free)

Compute a single 0-100 SEO score from on-page signals. Weighted by impact. Compare scores across pages or before/after fixes. Free, fast.

SERP Preview Tool — See Your Page in Google Search Results (Free)

Preview how your page will appear in Google search results. Pixel-accurate desktop and mobile rendering. Title, URL, description, sitelinks. Free.

Sitemap XML Generator — Build Sitemap.xml for Google, Bing, IndexNow

Generate a valid sitemap.xml from a URL list or by crawling a site. Adds lastmod, changefreq, priority. Splits >50K URLs into a sitemap index. Free.

Structured Data Validator — Test JSON-LD, Microdata, RDFa Online

Validate JSON-LD, Microdata, and RDFa schema against schema.org and Google rich-result rules. Catch missing required fields. Free, instant.

Twitter Card Validator — Preview Twitter (X) Link Cards (Free)

Validate twitter:card meta tags. Preview summary, summary_large_image, app, and player cards. Image-size warnings, fallback-to-OG check. Free.

Text tools — ZTools

Browse ZTools text tools, with use cases and examples for each one.

Add Prefix to Lines — Bulk Line Editor, Free

Add a prefix or suffix to every line in text. Bulk line editing for code, lists, configs. Browser-only.

Article Rewriter — Free Synonym-Based Paraphrasing

Rewrite articles via synonym substitution and sentence restructuring. Free, browser-only — no AI API costs, no signup. Use ethically.

ASCII Art Generator — Convert Text to ASCII Banners Free

Generate ASCII-art banners and figlet-style text from any input. 50+ fonts, instant copy. Free, browser-only, perfect for terminals and READMEs.

Bionic Reading Converter — Speed-Reading Text Free

Convert any text into bionic reading format — bold first letters guide the eye for faster reading. Browser-only, free, instant.

Character Counter — Count Letters, Spaces, Words, Bytes (Free)

Count characters with and without spaces, words, sentences, and bytes. Live count for tweets, SMS, essays, and meta tags. Free.

Remove Duplicate Lines — Deduplicate Text & Lists Instantly (Free)

Remove duplicate lines from any text or list. Case-sensitive option, preserve first or last occurrence, count duplicates. Free, fast.

Find and Replace Text — Bulk Edit, Regex Support, Case Options (Free)

Find and replace text in any document with case-sensitive, whole-word, and regex options. Multiple replacements at once. Free, browser-based.

Google Fonts Pair Finder — Free Heading + Body Combinations

Discover Google Fonts pairings (heading + body) with live preview, popularity weighting, and copy-paste import code. Free, no signup.

Grammar Checker — Spelling, Punctuation & Style Errors (Free)

Check grammar, spelling, punctuation, and style mistakes. Inline highlights, fix suggestions, plain-English explanations. Free.

Join Strings — Combine Lines with Custom Separator Free

Join lines of text into a single string with any separator (comma, pipe, custom). Optional quoting, prefix, suffix. Free, browser-only.

Letter Frequency Counter — Free Online, Browser-Only

Count letter frequency in any text. Useful for cryptography, linguistics, scrabble. Browser-only — no signup.

Line Counter — Count Lines of Text or Code Instantly (Free)

Count lines of text, code, or any document. Includes blank-line and non-blank counts, plus character and word totals. Free, online.

List Filter — Filter Lines by Contains, Starts With, Ends With

Paste a list and keep only the lines that match: contains, starts with, ends with, exact match, or empty and non-empty lines.

Lorem Ipsum Generator — Custom Length, Words, Paragraphs

Generate placeholder Lorem Ipsum text. Custom paragraphs, sentences, words. Includes start with "Lorem ipsum" or randomized variants. Free.

Multiple Whitespace Remover — Collapse Spaces, Tabs, Newlines (Free)

Remove extra spaces, tabs, and blank lines. Collapse runs of whitespace to single spaces. Cleans pasted text instantly. Free.

Palindrome Checker — Test Words, Phrases & Numbers Instantly (Free)

Check if a word, phrase, sentence, or number is a palindrome. Ignores case, spaces, punctuation. Free, instant.

Paraphrasing Tool — Rewrite Sentences in Different Words (Free)

Rewrite text in your own words while preserving meaning. Synonym substitution, sentence restructuring, multiple variants. Free.

Pick Random Item Online — From a List, Free

Pick one (or N) random items from any list. Fair, configurable, with weighting support. Browser-only.

Plagiarism Checker — Compare Text for Duplicate Content (Free)

Compare two texts side by side, highlight matching passages, and compute a similarity score. Useful for citation review. Free.

Random Text Generator — Words, Sentences, Paragraphs Free

Generate random text — words, sentences, paragraphs, or Lorem Ipsum-style filler. Adjustable length and language. Free, no signup, browser-only.

Reading Time Estimator — Estimate Reading Minutes for Any Text (Free)

Estimate reading time for articles, blog posts, and documents. Adjustable WPM, complexity factor, and per-language defaults. Free.

Remove Unicode Font — Strip Stylized Text, Free

Convert stylized Unicode text (𝓼𝓽𝔂𝓵𝓮, 𝕒𝕓𝕔, 𝓪𝓫𝓬) back to plain ASCII. Browser-only — no signup.

Repeat String Online — Multiply Text, Free

Repeat any string N times with optional separator. For test data, formatting, fillers. Browser-only.

Sentence Counter — Count Sentences, Words & Paragraphs (Free)

Count sentences, words, paragraphs, and characters in any text. Average sentence length, longest sentence flagging. Free.

Shuffle Letters Online — Anagram Maker, Free

Shuffle the letters of any word or phrase. Generate random anagrams. Browser-only — no signup.

Shuffle Lines — Randomly Reorder Lines of Text Free

Randomly reorder lines of text or list items using Fisher–Yates shuffle. Useful for randomising playlists, quiz options, and study cards. Free.

Shuffle Words — Random Word Reordering (Free)

Randomise the word order of any text using Fisher–Yates shuffle. Useful for poetry, language games, and randomness demos. Free, no signup.

Split String — Break Text by Separator into Lines (Free)

Split a string into lines by any separator — comma, pipe, regex, fixed length. Trim, dedupe, sort options. Free, browser-only.

Spoof Unicode Text — Lookalike Character Replacer (Free)

Replace Latin letters with visually-identical Unicode lookalikes (Cyrillic, Greek). For research and demos of homoglyph attacks. Free, ethical use.

Text Case Converter — UPPER, lower, Title, camelCase, snake_case

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE. Free, instant.

Text Diff Checker — Compare Two Texts, Highlight Changes Online

Paste two versions of a document and see every added, removed, and changed line highlighted. Word-level diff, unified or side-by-side, browser-only.

Text Reverser — Reverse String, Words, Sentences, Lines (Online)

Reverse any text — by character, word, sentence, or line. Unicode-aware (handles emoji, accents). Free, in-browser, no length limit.

Sort Lines of Text — Alphabetical, Numeric, Length, Reverse (Free)

Sort any list of lines alphabetically, numerically, by length, or reverse. Case options, natural sort for filenames. Free, instant.

Text Summarizer — Auto-Summarize Articles to Key Points (Free)

Summarize any article, document, or paste to its key sentences. Adjustable length, extractive algorithm, no AI cost. Free, fast.

Text to Handwriting Converter — Free Realistic Output

Convert typed text to realistic handwriting on lined paper. Adjust ink color, pen size, slant, and paper. Export as PNG/PDF. Free.

Text to Image — Render Quotes & Snippets as PNG (Free)

Render any text as a PNG image with custom font, color, background, and size. Browser-only Canvas — no server, no upload, instant export.

Text to Speech — Free Browser TTS, Multi-Language Voices

Convert text to spoken audio in dozens of languages and voices using the browser Web Speech API. Adjust rate, pitch, volume. Free, no signup.

Text to Unicode Font — Fancy Bold/Italic Text Generator

Convert plain text to fancy Unicode fonts: bold, italic, script, fraktur, monospace, double-struck, and more. Copy-paste into Twitter, Instagram, Discord.

Text Trimmer — Remove Leading & Trailing Whitespace from Lines (Free)

Trim leading or trailing spaces, tabs, and newlines from text or every line. Strip empty lines optionally. Free, browser-based.

Text Truncator — Cut to Length, Free Online

Truncate text to N characters or words. Add ellipsis. Word-boundary smart. Browser-only — no signup.

Text Wrapper — Wrap or Unwrap Text at a Line Width

Wrap text to a fixed line width by word or character, with paragraph preservation and indentation — or unwrap it back into continuous lines.

Word Counter — Words, Characters, Sentences, Reading Time

Count words, characters (with/without spaces), sentences, paragraphs, reading time. Live as you type. Supports CJK, RTL, emoji.

Word Frequency Counter — Find Most-Used Words in Any Text (Free)

Analyze any text to find the most-frequent words. Filters stopwords, shows percentages, exports CSV. Free, browser-based.

Zalgo Text Generator — Glitchy Cursed Text Free

Generate glitchy "Zalgo" text with stacked Unicode combining marks. Adjust intensity above/below/middle. Free, browser-only, copy-paste anywhere.

Utility tools — ZTools

Browse ZTools utility tools, with use cases and examples for each one.

Age Calculator — Years, Months, Days, Hours from Date of Birth

Calculate exact age in years, months, days, weeks, hours, and minutes between any two dates. Free, in-browser, no signup.

Alarm Clock Online — Free, Custom Sounds, Browser

Free online alarm clock — set time, custom sounds, snooze, fullscreen mode. Browser-only — no signup.

Aspect Ratio Calculator — Free Pixel Dimensions Tool

Calculate width/height for any aspect ratio (16:9, 4:3, 1:1, 2.35:1). Resize images and videos while preserving ratio. Free, instant.

Barcode Scanner — Free Online via Webcam, Browser

Scan barcodes with your webcam. Code 128, EAN, UPC, QR, more. Browser-only — no upload, no signup.

Billable Hours Calculator — Free Time Tracker

Track billable hours, calculate invoice amounts, multi-rate clients. Free, browser-only — no signup.

Bulk URL Checker — Test Many URLs for Status & Redirects

Check a list of URLs for HTTP status, redirects, response time, and redirect chain. Browser-only, free, batch-friendly.

Code Beautifier — Free Online Formatter for HTML, CSS, JS, JSON

Beautify minified or messy HTML, CSS, JavaScript, JSON, XML, SQL with proper indentation, line breaks, and consistent style. Free.

Code Minifier — Compress HTML, CSS, JS, JSON Free

Minify HTML, CSS, JavaScript, JSON by stripping whitespace, comments, optional renames. Reduce file size 30–80% for production.

Code to Image Converter — Beautiful Code Screenshots Free

Turn code snippets into beautiful PNG images for blog posts, tweets, and presentations. Syntax highlighting, themes, custom backgrounds.

Online Coin Flip — Heads or Tails, Crypto-Strong Random

Flip a virtual coin. Single flip, multiple flips, statistics. Crypto-strong random. Sharable result link. Free, in-browser.

Color Contrast Checker — WCAG AA / AAA Compliance Tool

Check text/background color contrast against WCAG AA (4.5:1) and AAA (7:1). APCA-aware, color-blind preview. Free.

Advanced Color Picker — Alpha, CMYK/HSV, Contrast, PNG Export

Fine-tune any color with per-channel H/S/L, R/G/B, and alpha sliders. Read HEX, RGB, HSL, HSV, CMYK, check WCAG contrast, and export the swatch as PNG.

Countdown Timer — Set a Timer for Any Date or Duration (Free)

Set a countdown to any date or duration. Audio + browser notification on finish. Sharable link. Free, in-browser, no signup.

Credit Card Validator — Luhn Check + Issuer / BIN Lookup (Free)

Validate credit card numbers: Luhn checksum, issuer detection (Visa, MC, Amex, etc.), BIN lookup. Free, in-browser, no signup.

Date Calculator — Add or Subtract Days, Weeks, Months from a Date

Add or subtract days, weeks, months, years from any date. Find the difference between two dates. Business-day mode. Free.

Date Difference Calculator — Days, Weeks, Months, Years

Calculate the difference between two dates in days, weeks, months, years, hours, minutes. Business-day mode and timezone-aware. Free.

Device Info — Browser, OS, Screen, Free Detection

See what your browser knows about your device: OS, browser, screen, GPU, language, timezone. Privacy-aware.

Online Dice Roller — D4, D6, D8, D10, D12, D20, D100 (Free)

Roll any combination of polyhedral dice: d4, d6, d8, d10, d12, d20, d100. Modifiers and advantage. Crypto RNG. Free.

Diff Checker — Compare Text, Code, JSON Side-by-Side (Online)

Compare two pieces of text or code side-by-side. Highlights additions, deletions, and changes line-by-line. Free, fast, runs in your browser.

Digital Clock Online — Full Screen, Free

Free online digital clock with 12/24 hour, seconds, fullscreen, multiple timezones. Browser-only.

DNS Lookup Tool — Query A, AAAA, MX, TXT, NS, CNAME Records Online

Look up DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, SOA. See TTLs and authoritative responses. Free, no rate limits.

Email Validator — RFC 5322 Syntax + DNS MX Record Check (Free)

Validate email addresses against RFC 5322 syntax + check the domain MX records exist. Bulk check up to 1,000 emails. Free.

Emoji Picker — Search 3,000+ Emoji by Keyword, Copy Instantly

Search 3,000+ emoji by keyword. One-click copy. Skin-tone variants. Recently used. Free, in-browser, no signup.

File Hash Calculator — MD5, SHA-1, SHA-256, SHA-512 Free

Calculate file hashes (MD5, SHA-1, SHA-256, SHA-512) in the browser. Verify downloads, detect tampering. No upload, instant.

IBAN Validator — Check International Bank Account Numbers

Validate IBAN numbers (International Bank Account Number) format and checksum for 75+ countries. Identify country, bank code, account.

Invoice Generator Pro — Free PDF Invoices for Freelancers

Create professional PDF invoices with logo, line items, tax, payment terms, and digital signature. Currency support, no signup, free.

IP Address Lookup — Geolocation, ISP, ASN, Reverse DNS (Free)

Look up any IPv4 or IPv6 address — geolocation, ISP, ASN, reverse DNS, and connection type. Includes lookup of your own public IP.

Memento Mori Calendar — Visualize Your Life, Free

Visualize your life in weeks. ~4000 weeks per lifetime — see how many you've lived. Browser-only.

Online Notepad — Free Browser Notepad with Autosave

Quick browser notepad for jotting notes, drafts, code snippets. Auto-save, dark mode, character/word count, no signup. Free, private.

Password Strength Checker — Entropy, Cracking Time, zxcvbn

Check password strength: entropy bits, estimated crack time, dictionary / pattern detection. Powered by zxcvbn. Free, in-browser.

Phone Number Validator — Country-Aware E.164 Format Checker

Validate phone numbers against country-specific rules. Returns E.164 format, line type, country. Bulk check. Free, in-browser.

Pomodoro Timer — 25/5 Focus Cycles with Long Breaks (Free)

Pomodoro timer with customisable 25/5 cycles, long breaks every 4 sessions, audio + browser alerts. Free, in-browser, no signup.

Random Name Generator — Multi-Locale, Free

Generate realistic random first/last names. 20+ locales. Test data, fictional characters, RPG. Browser-only.

Receipt Generator — Free Online, Customizable

Generate clean receipts with custom fields, tax, totals. PDF export. Browser-only — no signup.

Regex Tester — Live Match, Group Capture, Cheat Sheet

Test JavaScript regular expressions live. Highlights matches, shows capture groups, supports flags (gimsuy). Built-in cheat sheet. Free, client-side.

Scientific Calculator — Free Online with Trig, Log, Memory

Full-featured browser scientific calculator: trigonometry, logarithms, exponents, factorials, memory, history. No signup, works offline.

Online Stopwatch — Start, Stop, Lap with Millisecond Precision

Online stopwatch with start, stop, lap, reset. Millisecond precision. Multiple lap export to CSV. Free, in-browser.

Subnet Calculator — IPv4 / IPv6 CIDR Subnetting Tool Free

Calculate IPv4/IPv6 subnets, CIDR ranges, network/broadcast addresses, host counts, subnet masks. Browser-only, instant.

Online Timer — Free Countdown, Stopwatch, Pomodoro

Browser-based timer with countdown, stopwatch, and Pomodoro modes. Configurable alarms, dark mode, presets. Free, no signup.

Timezone Converter — Convert Time Between Any Two Cities

Convert a time between any two cities or timezones. Handles DST automatically. 400+ cities, 100+ timezones. Free, in-browser.

Twitter / X Ad Revenue Calculator — Estimate, Free

Estimate Twitter / X creator ad revenue based on impressions, engagement, follower count. Browser-only.

URL Validator — Syntax + Reachability Check for Links (Free)

Validate URLs: syntax, scheme, host, optional reachability check (HEAD). Bulk check up to 500 URLs. Free, in-browser.

User Agent Detector — See Your Browser, OS & Device Info

Detect your User Agent string, browser, OS, device type, and capabilities. Test bot detection, debug device-specific bugs. Free.

VIN Decoder — Free Vehicle Identification Lookup

Decode any 17-char VIN to manufacturer, model year, plant, body type. Browser-only — no API key.

WHOIS Lookup — Domain Registration, Owner, Expiry Date (Free)

Look up WHOIS data for any domain — registrar, registration date, expiry date, name servers, registrant (when public). Free, no limits.

World Clock Converter — Compare Times Across 5+ Cities at Once

Compare current and future times across many cities in one view. Visualise overlapping working hours. Free, in-browser.

ZTools Guides — How-To Tutorials

Task-oriented how-to guides for ZTools — getting the most out of the tools, browsing categories, and installing the extension, Android app, and PWA.

Get the most out of ZTools

Find a ZTools tool and review sign-in, saved work, appearance, and sharing options.

• guide
• getting-started
• workflow

Browse tools by category

Find ZTools tools by category and check each tool's route, processing, and plan requirements.

• guide
• navigation
• categories

Install the ZTools browser extension

How to install the ZTools browser extension for quick access to tools from any tab.

• guide
• extension
• chrome
• firefox

Install the ZTools Android app

How to install the ZTools Android app from Google Play, and what to expect on iOS.

• guide
• android
• mobile
• ios

Use Growth Suite tools

See which ZTools Growth Suite tools need an account, provider key, or shared AI allowance, and what happens when you run them.

• guide
• growth-suite
• ai
• seo

Install ZTools as an app (PWA)

How to install ZTools as a standalone app on desktop and mobile — and an honest note on offline use.

• guide
• pwa
• install
• offline

Speak — capture a thought, keep what matters

Record a thought in ZTools, then review the notes and tasks Speak suggests.

• guide
• speak
• voice

ZTools Blog

Release notes, tool spotlights, and dev journal.

Feed

Every post on the ZTools blog, newest first, with RSS and Atom links for your feed reader.

What's new in ZTools: tours, a phone app view and plans

Page tours and a six-step walkthrough, an app view on phones, the Workbench design, and ZTools Pro and Growth Suite plans.

• Release
• ZTools

Welcome to the ZTools Blog

This is the first post on the ZTools documentation blog. We'll use this space for:

• Release
• ZTools