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JWT Decoder

Decode JWT header and payload safely in your browser.

No uploads. Everything runs locally in your browser.

Header
{
  "alg": "HS256",
  "typ": "JWT"
}
Payload
{
  "user": "alice",
  "iat": 1680000000
}

How to use

  1. Paste your JWT.
  2. Header and payload decode instantly.
  3. No secrets required.

Features

  • Client-side decode.
  • Base64url safe handling.
  • No token sent anywhere.

FAQ

Is it safe?

Yes, decoding runs locally. Do not paste secrets if unsure.

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