Developer Tools
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
Format & BeautifyValidate & AnalyzeMinifyConvert to YAML
XML Tools
Format, minify, and convert XML documents
Format & BeautifyMinifyConvert to JSON
Text Tools
Encode, decode, escape, and transform text
Escape/UnescapeBase64URL EncodeCase Convert
Compare Tools
Find differences between text and data
Text DiffJSON DiffLine/Word/Char comparison
PDF Tools
Merge, split, rotate, and watermark PDF files
Merge PDFsSplit PagesRotateWatermark
Regex Tester
Test regular expressions with live matching
Live MatchingCapture GroupsAll FlagsCheatsheet
HTML Escape
Escape and unescape HTML entities
Escape HTMLUnescapeMultiple ModesEntity Reference
DateTime Converter
Convert dates and times between time zones
Timezone ConvertUnix TimestampWorld ClockISO Format