JWT Decoder
Decode and inspect JSON Web Tokens (JWTs). Shows header, payload and signature sections. Checks expiry. Runs in browser — token never sent anywhere.
How to use the JWT Decoder
What is a JWT?
A JSON Web Token consists of three Base64-encoded parts separated by dots: the header (algorithm), the payload (claims/data) and the signature. The header and payload are readable by anyone — the signature verifies integrity. Never put sensitive data in a JWT payload.
Frequently asked questions
Is the JWT Decoder free to use?
Yes, the JWT Decoder is completely free. There is no sign-up, no account required, and no limit on how often you can use it.
Is my text private when using the JWT Decoder?
Yes, all text processing happens in your browser. Your text is not sent to any server and is not stored anywhere outside your device.
What devices does the JWT Decoder work on?
The JWT Decoder works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.