JWT Decoder & Parser Online
Runs 100% in your browser — your files never leave your device.
A JSON Web Token is readable even when it is signed, but manually splitting and base64url-decoding the sections is tedious. Paste a three-part JWT to inspect its header, claims, and signature segment. This parser deliberately does not claim to verify authenticity.
How it works
- 1
Paste the JWT
- 2
Inspect header and claims
- 3
Treat decoded data as unverified
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