JWT Decoder
Paste a JWT to instantly read its header and payload as formatted JSON. Decoding happens in your browser — the token never leaves your device.
🔒 Decoded in your browser — the token never leaves your device. The signature is not verified (that requires the secret key).
🔒 Tout se passe dans ton navigateur — rien n'est envoyé ni stocké.
Questions fréquentes
- How do I decode a JWT?
- Paste the token (header.payload.signature) and its header and payload are shown as formatted JSON. No account or upload needed.
- Does it verify the signature?
- No. Decoding only reads the contents. Verifying the signature requires the secret or public key, which this tool intentionally never asks for.
- Is my token uploaded?
- No. The token is decoded entirely in your browser, so it never leaves your device — safe for real tokens.