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JWT Decoder
Decode a JWT's header and payload to inspect its claims. Free online tool that works entirely in your browser — no upload required.
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Help with this tool
Is decoding JWTs with PDFPilot really free?
Yes. JWT Decoder is completely free to use, with no sign-up or account required.
Are my tokens uploaded to a server?
No. Decoding runs entirely in your browser. Your token is never uploaded to PDFPilot's servers.
Does this verify the token's signature?
No. This tool decodes the header and payload only. Verifying a signature requires the issuer's real secret or public key, which this tool never has — treat this as a way to inspect a token's claims, not to confirm it's genuine.
What format does the token need to be in?
A standard JWT: three dot-separated Base64URL-encoded parts (header.payload.signature). Upload a .txt file containing the token text.
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