io9.me
A collection of essential developer tools for formatting, validating, encoding, and comparing data. Fast, private, and works offline.
Lightning Fast
All processing happens in your browser - no server calls needed
Privacy First
Your data never leaves your browser - 100% client-side
Works Offline
Use these tools even without an internet connection
Tools
JSON Tools
Format, validate, minify, and convert JSON data
XML Tools
Format, minify, and convert XML documents
Text Tools
Encode, decode, escape, and transform text
Compare Tools
Find differences between text and data
PDF Tools
Merge, split, rotate, and watermark PDF files
Regex Tester
Test regular expressions with live matching
HTML Escape
Escape and unescape HTML entities
ASCII Art
Convert any image to ASCII art
Whiteboard
Sketch diagrams and wireframes
QR Code
Generate QR codes for any URL or text
Markdown Preview
Live markdown editor and preview
JWT Decoder
Decode and inspect JSON web tokens
DateTime Converter
Convert dates and times between time zones