Free Developer Tools — no sign-up, no uploads
12 fast, free tools that run entirely in your browser. Type a command above, or just click one:
$ json
JSON Formatter
Format, validate and minify JSON
$ jwt
JWT Decoder
Decode JWT header & payload
$ b64
Base64 Encode / Decode
Encode & decode Base64 text
$ url
URL Encode / Decode
Percent-encode & decode URLs
$ uuid
UUID Generator
Generate UUID v4 in bulk
$ regex
Regex Tester
Test regex with live highlighting
$ cron
Cron Builder
Build & explain cron expressions
$ color
Color Converter
Convert HEX ⇄ RGB ⇄ HSL
$ hash
Hash Generator
MD5, SHA-1 & SHA-256 hashes
$ md
Markdown Previewer
Live Markdown preview
$ lorem
Lorem Ipsum Generator
Generate placeholder text
$ 404
404 Page Generator
Design & export a custom 404 page
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