Free developer utilities — all processing happens locally in your browser.
Simple, fast, private. No uploads, no registration.
Encode text, files, and images to Base64. Decode Base64 back to original format.
Encode URLs, decode percent-encoded strings, parse query parameters.
Format JSON with indentation, minify, validate, and fix common errors.
Write Markdown and see the rendered HTML preview in real-time.
Convert special characters to HTML entities (< ↔ <) and back.
Decode JWT header and payload. Inspect claims without verifying signatures.