Free Developer Tools
Free developer tools: format JSON and SQL, build & explain cron expressions, generate CSS gradients and box-shadows, convert JSON to CSV and Markdown to HTML, check color contrast, decode JWTs, test regex and more — all client-side and private.
UUID Generator
Generate random UUID (v4) identifiers.
JSON Formatter
Format, beautify & validate JSON.
Base64 Encode / Decode
Encode or decode Base64 text.
Color Converter
Pick a color, get HEX, RGB & HSL.
Hash Generator
Generate SHA-256 / SHA-1 hashes.
Unix Timestamp Converter
Convert Unix time to a date & back.
CSV ↔ JSON Converter
Convert between CSV and JSON.
JWT Decoder
Decode a JWT header & payload.
Regex Tester
Test regular expressions live.
Text Diff Checker
Compare two texts line by line.
URL & HTML Encoder
Encode/decode URL & HTML entities.
Text to Binary
Convert text ↔ binary.
Color Palette Generator
Generate color schemes.
JSON ↔ YAML Converter
Convert JSON and YAML.
Image to Base64
Encode an image as a Base64 data URI.
Cron Expression Generator
Build & explain cron schedules.
SQL Formatter
Beautify & format SQL queries.
JSON to CSV
Convert a JSON array to CSV.
Markdown to HTML
Convert Markdown into HTML.
CSS Gradient Generator
Design CSS gradients visually.
CSS Box Shadow Generator
Design CSS box-shadows visually.
Color Contrast Checker
Check WCAG color contrast.
Meta Tag Generator
Generate SEO & Open Graph tags.