All tools
33 free tools that run entirely in your browser. Nothing is uploaded, nothing is stored, no account needed.
Developer Tools
More →Base64 Encoder & Decoder
Encode or decode Base64 and URL-encoded text instantly. Supports UTF-8, large payloads, and one-click copy. Nothing leaves your browser.
CSV to JSON Converter
Convert CSV to JSON with a live table preview. Handles quoted fields, embedded commas and newlines per RFC 4180. Runs in your browser.
Hash Generator
Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests plus CRC32 checksums of any text, right in your browser. No uploads, no server.
HTML Entity Encoder
Escape or unescape HTML special characters. Convert &, <, >, quotes and named entities to safe code for safe HTML output.
IPv4 Converter
Convert IPv4 addresses to decimal, hex, binary and CIDR notation. See subnet ranges, address class and whether the address is private.
JSON Formatter
Format, validate and minify JSON instantly with syntax highlighting and precise error location. Runs 100% in your browser — nothing is uploaded.
JSON to CSV Converter
Convert a JSON array into CSV for Excel, Google Sheets or any spreadsheet. Handles nested objects and missing keys. Runs in your browser.
JWT Decoder
Decode and inspect JSON Web Tokens locally. See the header, payload, registered claims and expiry status. Signatures are not verified.
Regex Tester
Test regular expressions against your text with live match highlighting. Shows every match, its index and capture groups.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Handles seconds, milliseconds, ISO 8601 and relative time. Timezone-aware.
URL Encoder & Decoder
Percent-encode or decode URLs and query strings. See the difference between encodeURI and encodeURIComponent. Runs in your browser.
UUID Generator
Generate UUID v4 (random) or v1 (time-based) identifiers in bulk. Cryptographically secure, no tracking, no database. Nothing leaves your browser.
Writing Tools
More →Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more. All 14 conversions at once.
Diff Checker
Compare two texts and see exactly which lines were added or removed. Side-by-side, colour-coded and instantly readable.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences or words. Classic Latin filler for mockups and design work.
Markdown Preview
Write Markdown and see it rendered instantly. Supports headings, lists, code blocks, tables, links and images. Works offline.
Slug Generator
Turn any title into a clean, SEO-friendly URL slug. Strips accents, removes special characters and supports custom separators.
Word Counter
Count words, characters, sentences and paragraphs instantly. Also shows reading time, speaking time and your top keywords.
Design Tools
More →Color Converter
Convert colors between HEX, RGB, HSL, HSV and CMYK. Includes a live swatch and WCAG contrast ratio. Runs entirely in your browser.
CSS Gradient Generator
Create linear, radial and conic CSS gradients with a live preview. Copy the CSS instantly. Works entirely in your browser.
Length Unit Converter
Convert between px, rem, em, pt, in, cm, mm, vw and vh. Essential for responsive design and pixel-perfect CSS.
Image Tools
More →Favicon Generator
Create a simple SVG favicon from your initials and brand colours. Live preview, instant download, no account needed.
Image Compressor
Compress and resize images right in your browser. Reduce file size for faster uploads and better page speed. Files never leave your device.
Image Metadata Viewer
Check an image's dimensions, aspect ratio, megapixels and print size. Also reads EXIF data including camera, lens and GPS.
QR Code Generator
Create custom QR codes for URLs, WiFi, text and more. Adjust size, colours and error correction. Generated entirely in your browser.
Security Tools
More →Password Generator
Generate cryptographically random passwords with adjustable length and character sets. Entropy estimate included. Nothing is stored or sent anywhere.
Password Strength Checker
Test how strong a password is. Estimates entropy, crack time and flags common patterns. Your password never leaves your browser.
TOTP Code Generator
Generate a TOTP or HOTP authentication code from your 2FA secret. Works with Google Authenticator and any standard app. Fully offline.
Math & Calculators
More →Area & Perimeter Calculator
Calculate area, perimeter, diagonals and angles for rectangles, squares, circles and triangles. Shows the working.
Number to Words
Convert any number to words in English. Also shows ordinal form, currency and Roman numerals. Instant and completely offline.
Percentage Calculator
All common percentage calculations in one place: percent of a number, percentage change, ratio to percentage and increase/decrease.