Developer Tools
22 free tools
Free online developer tools. Format JSON, test regex, decode JWTs, encode Base64, generate hashes, and build CSS visually. Everything runs in your browser.
JSON Formatter
Prettify and validate JSON.
Timestamp Converter
Unix to date & back.
Base64 Encoder/Decoder
Encode/decode Base64 strings.
Regex Tester
Real-time regex matching.
JWT Decoder
Inspect JWT tokens.
Markdown Editor
Live Markdown preview.
URL Encoder/Decoder
Encode/decode URLs.
Hash Generator
SHA-256, MD5, SHA-1 hashes.
HTML Encoder/Decoder
Encode/decode HTML entities.
Cron Expression Generator
Build cron jobs easily.
Text Diff Checker
Compare and diff text.
CSS Box Shadow Generator
Create CSS box shadows.
CSS Text Shadow Generator
Create CSS text shadows.
CSS Flexbox Generator
Visual flexbox builder.
CSS Grid Generator
Visual CSS Grid builder.
CSS Filter Generator
Visual CSS filter effects.
CSS Button Generator
Design CSS buttons visually.
CSS Gradient Text Generator
Gradient text with live preview.
HTML Table Generator
Visual HTML table builder.
CSS Minifier / Beautifier
Minify or beautify CSS code.
HTML Minifier / Beautifier
Minify or beautify HTML code.
JavaScript Minifier / Beautifier
Minify or beautify JavaScript.
About Developer Tools
Free online developer tools. Format JSON, test regex, decode JWTs, encode Base64, generate hashes, and build CSS visually. Everything runs in your browser. Every tool runs entirely in your browser with no data uploaded to any server. No signup, no limits, completely free.