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JWT Decoder & Encoder

This tool runs entirely in your browser. No data is sent to a server.

Verify Signature

Header (Algorithm & Token Type)

{}

Payload (Data)

{}

Signature

The signature is base64url encoded and verifies the token hasn't been tampered with.

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Header (JSON)

Payload (JSON)

Signature Key

For RS256+, provide the Private Key in PEM format.