Encoding & Security

JWT Decoder

Decode JWT header and payload (no signature verification).

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JWT

Header

Payload

⚠ This decoder does NOT verify the signature. Never trust JWT contents without verification.

Common questions

FAQ

1 Does this verify the signature?

No — this is a decoder only. Use a server-side library with the correct secret/public key to verify.

2 Is my token sent anywhere?

No. Decoding happens entirely in your browser.

Encode or decode Base64 text.

Percent-encode or decode URLs.

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

Create strong random passwords.

Compute HMAC with SHA-256/384/512.