Free Developer Tools
Format JSON, test regex, decode JWTs, generate UUIDs, hash strings, encode Base64, compare text diffs — all in your browser with no signup, no rate limits.
14 free tools for developers
JSON Formatter
Format, validate, and minify JSON instantly
CSV to JSON Converter
Convert CSV files to clean JSON instantly — free, private, no upload
JSON to CSV Converter
Convert JSON arrays to CSV — free, private, instant download
Base64 Encoder / Decoder
Encode and decode Base64 text and files instantly
UUID Generator
Generate UUIDs v1, v4 & v7 instantly in your browser
Regex Tester
Test and debug regular expressions with live match highlighting
JWT Decoder
Decode and inspect JWT tokens — header, payload, claims, expiry
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files
Markdown Editor
Write Markdown with a live split-pane preview — download .md or copy HTML
Password Generator
Generate secure, random passwords instantly
Text Diff Checker
Compare two texts and highlight the differences instantly
Lorem Ipsum Generator
Generate placeholder text for designs and prototypes instantly
Color Contrast Checker
Check WCAG color contrast ratios for accessible web design
CSS Gradient Generator
Build beautiful CSS gradients visually and copy the code instantly
Browse all tools by Designers, Marketers, Freelancers, Writers & Content Creators, Students, Founders & Small Business Owners.