Yes, JWT Decoder is completely free to use with no signup required.

Does JWT Decoder send my data to a server?

No. JWT Decoder runs entirely in your browser using client-side JavaScript. Your data never leaves your device.

What is JWT Decoder used for?

Decode a JWT's header, payload, and expiry entirely in your browser. Your token never leaves this tab — unlike jwt.io.

DevTab

Never leaves your browser

Decode JWT header and payload, and see the expiry countdown. Zero network requests, ever.

Decoding happens with local JavaScript only — open DevTools → Network and confirm: zero requests fire as you type.

JWT

Expired 553d 21h 45m ago

Header

Payload