Developer Tools
21Encode, decode, and inspect data on this device — handy when you cannot paste secrets into a random website.
JSON
Base Encoding
Web & Security
Generate & Design
Frequently Asked Questions (FAQ)
Decoding happens in your browser only. Still avoid pasting real production secrets on a shared or untrusted device.
No server history. Some settings may stay only in this browser; you can clear site data anytime.
Base Encoding covers Binary, Hex, Base64, and image ↔ Base64. Web & Security covers URL, HTML entities, JWT, Punycode, and similar web/auth helpers.
Yes. The CSV ↔ JSON converter under JSON can open Excel files in the browser and export sheets. Split very large workbooks first.
They are grouped under Generate & Design: UUID, Lorem Ipsum, Color Table, and Image Color Extractor.