Developer Tools
Free online developer tools: UUID generator, JWT decoder, JSON formatter, Base64, hash generator, regex tester, and more. Fast, private, in-browser.
True Random UUID Generator - Bulk v4 & v7 UUIDs Online
Generate UUIDs with true randomness: atmospheric-noise seeding from RANDOM.ORG or local CSPRNG. Version 4 and time-ordered v7, single or bulk up to 1,000.
JWT Decoder - Decode & Verify JSON Web Tokens Online
Decode JWT header and payload instantly and verify HS256 signatures in your browser. Tokens never leave your device — a fast, private JWT inspector.
Base64 Encoder & Decoder - Convert Text and Files Online
Encode text or files to Base64 and decode Base64 back to text in your browser. Supports UTF-8, URL-safe Base64, and data URIs — fast, free, and private.
URL Encoder & Decoder - Encode URLs and Query Strings
Percent-encode or decode URLs, query strings, and form data online. Handles UTF-8 and reserved characters correctly — a fast, private, in-browser tool.
Hash Generator - MD5, SHA-1, SHA-256 & SHA-512 Online
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text right in your browser. Compare checksums and verify integrity — nothing is sent to a server.
True Random Password Generator - Strong Secure Passwords
Create strong passwords with true randomness: RANDOM.ORG atmospheric-noise seeding or local CSPRNG, custom length and symbols — nothing leaves your browser.
JSON Formatter & Validator - Beautify, Minify & Check JSON
Format, validate, and minify JSON online with clear error messages and adjustable indentation. Paste raw JSON and get clean output — private, in-browser.
Unix Timestamp Converter - Epoch Time to Date & Back
Convert Unix timestamps to human-readable dates and dates back to epoch seconds or milliseconds. See UTC and local time side by side — fast and free.
Case Converter - camelCase, snake_case, Title Case & More
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and more. Paste once, copy any style — free and instant.
Word Counter - Count Words, Characters & Sentences Online
Count words, characters with and without spaces, sentences, paragraphs, and estimated reading time as you type. Works for essays, posts, and CJK text.
Regex Tester - Test Regular Expressions with Live Matches
Test JavaScript regular expressions against sample text with live match highlighting, flags, and capture groups. Debug patterns fast — free and private.
Text Diff Checker - Compare Two Texts and Highlight Changes
Compare two blocks of text and see additions and deletions highlighted line by line or word by word. Great for code, documents, and contracts — private.
Cron Expression Parser - Explain Cron Schedules in English
Paste a cron expression and get a plain-English explanation plus the next scheduled run times. Supports standard 5-field crontab syntax — free and instant.
QR Code Generator - Create Free QR Codes for URLs & Text
Create QR codes for URLs, text, Wi-Fi, and contact info with adjustable size and error correction. Download as PNG — generated locally in your browser.
Color Converter - HEX, RGB, HSL & OKLCH Color Codes
Convert colors between HEX, RGB, HSL, and OKLCH with a live preview and copy-ready CSS values. Pick a color or paste a code — free, fast, in-browser.
True Random Number Generator - Atmospheric Randomness
Generate true random numbers seeded by atmospheric noise from RANDOM.ORG, with a secure in-browser fallback. Set ranges, counts, and uniqueness options.
Log Compare - Align & Diff Log Files by Timestamp
Compare multiple log files side by side with timestamp-aligned scrolling, per-file keyword and regex filters, and line highlighting. Free, local, open source.