JWT Decoder
Inspect the header and payload of a JSON Web Token. Signature verification is not performed.
How to use
Paste a three-part JWT. This tool only Base64URL-decodes the header and payload — it does not validate the signature.
Frequently asked questions
Is it safe to paste tokens here?
Decoding is local, but never paste production secrets into untrusted devices or shared screens.
Do you store the numbers I enter?
Calculations run in your browser. Inputs are not sent to our servers.