Browser-first · No sign-up

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 JWT Decoder

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

Key features of JWT Decoder

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

JWT Decoder — key benefits

  • Completely free with no signup or registration required.
  • Runs entirely in your browser — your data is never uploaded.
  • Works on desktop, tablet, and mobile devices.
  • Instant results with no waiting or processing queues.
  • Part of the ToolCircuit suite of free online developer tools tools.

FAQ

Is it safe?

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

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