JWT Decoder

Decode and inspect JSON Web Tokens.

How JWTs work

A JWT has three Base64URL parts separated by dots: header, payload and signature. The header and payload are just encoded JSON — anyone can read them.

Decoding does NOT verify the signature. Only a successful verification with the correct secret or public key proves the token was issued by someone holding the key and has not been modified. Always check exp, aud and iss on the server too.

Processed locally in your browser — your input is never uploaded.

What is JWT Decoder?

Decode and inspect JSON Web Tokens. A JWT has three Base64URL parts separated by dots: header, payload and signature. The header and payload are just encoded JSON — anyone can read them.

Is JWT Decoder free to use?

Yes. JWT Decoder on DevCipher is completely free, with no sign-up, no limits and no ads.

Is my data safe when I use JWT Decoder?

Yes. Everything runs locally in your browser. Your input is never uploaded to a server, and sensitive values such as keys and tokens are never saved.

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