Free online developer tools. Fast, private, no tracking.
All processing happens in your browser — no data is sent to any server.
- JSON Formatter — Format, minify, and validate JSON
- Base64 — Encode and decode Base64 strings
- URL Encode/Decode — Encode and decode URL components
- Timestamp — Convert between Unix timestamps and dates
- UUID Generator — Generate random UUIDs (v4)
- Hash Generator — SHA-1, SHA-256, SHA-512 hashes
- Regex Tester — Test regular expressions with real-time matching
- JWT Decoder — Decode and inspect JSON Web Tokens
- Color Converter — Convert between HEX, RGB, and HSL
- Markdown Preview — Preview Markdown with live rendering
- 🔒 100% client-side — your data never leaves your browser
- ⚡ Instant — no loading, no frameworks, no build step
- 🎨 Dark theme — easy on the eyes
- 📱 Responsive — works on mobile
- 🚀 ~20KB total — lighter than most favicons
MIT