Developer Tools
A fast, private toolkit built for engineers — format and validate JSON, decode JWTs, test regular expressions, generate UUIDs, convert JSON to TypeScript and more. Every tool runs entirely in your browser: no signup, no uploads, and whatever you paste never leaves your device.
JSON & Data
Encoding & Security
Base64 Encoder & Decoder
Encode and decode Base64 text instantly, with full UTF-8 support.
encode · decode · UTF-8
JWT Decoder & Inspector
Decode and inspect JWT header, payload and claims — locally, never sent anywhere.
header · payload · exp
URL Encoder & Decoder
Percent-encode and decode URLs and query components safely.
percent-encode
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes in your browser.
SHA-1/256/384/512
Generators
Converters
Web & SEO
Robots.txt Generator
Build a valid robots.txt with allow/disallow rules and a sitemap line.
allow · disallow · sitemap
Sitemap Generator
Generate an XML sitemap from a list of URLs.
urls → xml
Schema Markup Generator
Generate JSON-LD structured data for common schema.org types.
json-ld · rich results
Open Graph Preview
Preview how a page looks when shared on social platforms and generate OG meta tags.
share card · meta tags
Color Palette Extractor
Extract a dominant colour palette from any image and copy HEX/RGB values.
image → hex · rgb
Formatters & Minifiers
SQL Formatter
Format and beautify SQL queries with consistent indentation.
mysql · postgres · more
HTML Minifier
Minify HTML to shrink page weight.
strip · collapse
CSS Minifier
Minify CSS for faster loads.
compress · size report
JavaScript Minifier
Minify JavaScript with Terser to reduce file size.
terser · mangle
SVG Optimizer
Clean and shrink SVG files without losing quality.
clean · preview