Developer tools that respect your privacy
Fast, free, offline-capable utilities. Everything runs in your browser. No data ever leaves your machine.
JSON Formatter
Format, validate, and minify JSON with syntax highlighting and tree view.
Base64 Encoder/Decoder
Encode and decode Base64 strings. Supports URL-safe variant and file uploads.
JWT Decoder
Decode JWT tokens. View header, payload, expiry status, and claims.
Regex Tester
Test regular expressions with live highlighting, match groups, and common patterns.
URL Encoder/Decoder
Encode and decode URLs with component parsing and query parameter breakdown.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
Color Picker & Converter
Pick colors and convert between HEX, RGB, and HSL. Preview swatches and contrast ratios.
Unix Timestamp Converter
Convert between Unix epoch timestamps and human-readable dates. Live clock with UTC and local time.
Diff Checker
Compare two texts side by side. See added, removed, and unchanged lines with highlighting and stats.
Cron Expression Builder
Build cron expressions visually with live preview, human-readable descriptions, and next run times.