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Decode and inspect JWT tokens — header, payload, and signature.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022,
"exp": 9999999999
}SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe token used for securely transmitting claims. It has header, payload, and signature parts.
Is it safe to decode JWTs here?
Yes. This tool only Base64-decodes the header and payload. No data is sent to any server.
Does this tool verify signatures?
No — this is a decoder only. Signature verification requires the secret key, which should never be shared with public tools.