JustilityDeveloper tools
on your device
Small tools. All yours.
Format, compare, encode and inspect text without a processing server.
Developer tools
JSON formatter & validator
Format, validate or minify JSON locally.
Open toolJSON to CSV converter
Convert an array of flat objects into CSV.
Open toolCSV to JSON converter
Parse a header-based CSV into JSON without changing cell strings.
Open toolJSON diff checker
Compare JSON values while ignoring object key ordering.
Open toolBase64 encoder / decoder
Encode or decode UTF-8 text and local binary files.
Open toolURL encoder / decoder
Encode or decode a URL component.
Open toolRegex tester
Test JavaScript regular expressions in a time-limited worker.
Open toolText diff checker
Compare text line by line with escaped output.
Open toolMarkdown editor & preview
Edit Markdown with a sanitized local preview.
Open toolJWT decoder
Inspect a token header and payload without sending it anywhere.
Open toolPassword generator
Generate cryptographically random passwords on your device.
Open toolRandom number generator
Generate uniformly selected integers using browser cryptography.
Open toolPrivate comes standard.
Your inputs are processed on your device. No file uploads or processing server. Read our privacy page for information about site analytics.
Open. Use. Done.
No accounts or hoops to jump through. Just useful tools, ready when you are.
Free means free.
No ads, paywalls, or daily allowances. A small corner of the web that keeps it simple.