JWT Decoder
Decode the Base64URL header and payload of a JWT for debugging and documentation. The tool never sends the token away, but it does not verify the signature or prove that any claim is trustworthy.
Local text workbenchBrowser local
Processed output will appear here.
This tool only decodes the header and payload. It does not verify the signature, issuer, audience, or time claims.
Processed output will appear here.
Data handling notes
- Only the header and payload are decoded in the browser.
- Signature verification is intentionally not performed without a trusted key and algorithm context.
- Decoded claims may be forged; never authorize a user from this output.
FAQ
Does a readable payload mean the token is valid?No. Anyone can create a readable JWT; validity requires signature, issuer, audience, and time checks.
Is the token uploaded?No. Decoding happens locally in the browser.