Free online developer tools for web developers and engineers. Format and validate JSON, encode or decode URLs and Base64, decode JWT tokens, test regular expressions, convert colors, generate hashes, and create QR codes — all browser-based, no installations.
9 tools available
Encode or decode Base64 text instantly in your browser.
Format, validate, and minify JSON instantly — with syntax error highlighting.
Percent-encode URLs or decode URL-encoded strings instantly.
Decode and inspect JWT tokens — header, payload, and expiry — instantly.
Test and debug JavaScript regular expressions with live match highlighting.
Convert colors between HEX, RGB, and HSL instantly.
Generate SHA-256, SHA-512, SHA-384, and SHA-1 hashes from any text.
Convert Markdown to HTML with a live side-by-side preview.
Generate QR codes from any URL, text, or contact info. Download as PNG.