JWT Decoder
Decode a JWT's header and payload — no signature verification.
This only decodes the token's header and payload — it doesn't verify the signature. Verifying requires the secret or public key the token was signed with.
How to use this tool
- 1
Paste a JWT into the input box.
- 2
The header and payload decode automatically.
- 3
Copy either section, or inspect the claims directly.
Frequently asked questions
Does this verify the token's signature?+
No, it only decodes the header and payload — it doesn't check whether the signature is valid.
Is my token sent anywhere?+
No, decoding happens entirely in your browser; your token is never transmitted.
Can it decode expired tokens?+
Yes, it decodes the contents regardless of the expiry claim.