How to use JWT Decoder
- Enter or paste your JWT into the input field to begin.
- The result is computed live in your browser as you edit the input.
- When it looks right, Copy to save it.
About this tool
There is no server behind JWT Decoder. JWT Decoder splits and base64url-decodes a JWT locally so you can inspect its claims.
Signature verification that needs a secret should be done in a trusted environment; JWT Decoder focuses on decoding. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What does JWT Decoder do?
JWT Decoder lets you decode your input right in the browser, with the result shown instantly and nothing uploaded.
Do I need an account for JWT Decoder?
No — JWT Decoder needs no account, sign-up or installation.
Is my input private in JWT Decoder?
Yes — your input never leaves your device; JWT Decoder does all the work in your browser.
Does JWT Decoder verify the JWT signature?
JWT Decoder decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Can I use JWT Decoder without a connection?
Yes — after the first load JWT Decoder runs entirely offline.