JWT Decoder

Decode JWT header and payload. View claims, expiration, and issuer. All processing in your browser.

JWT Token

Paste a JWT above to decode header and payload. Signature is not verified (client-side only).

Privacy

Decoding runs entirely in your browser. We do not verify the signature (that would require your secret). Do not paste tokens that contain sensitive data into untrusted sites.

Frequently Asked Questions

Yes, completely free. Decode JWTs in your browser with no sign-up.

No. Signature verification would require your secret. This tool only decodes the base64 header and payload for debugging.

No. Decoding runs entirely in your browser. Your token never leaves your device.

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