JWT Decoder

Decode and verify JWT tokens online for free. Inspect payload and header instantly.

✓ Free✓ No sign-up✓ Works in browser

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JWT Token

Token has no expiration

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

Signature

SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

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How to Use This Tool

Paste Your JWT Token

Paste your full JWT token string (the three dot-separated parts) into the input field.

Inspect the Decoded Parts

The tool instantly decodes and displays the Header (algorithm and token type) and Payload (claims like user ID, name, expiry) in formatted JSON.

Check Token Expiry

The status bar at the top shows whether the token is valid or expired, and if valid, how much time remains until expiry.

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Frequently Asked Questions

What is a JWT token?

JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. It consists of three Base64-encoded parts: Header (algorithm), Payload (data/claims), and Signature (verification).

Is it safe to paste a JWT in this tool?

For testing JWTs, yes. However, never paste production JWTs that grant access to real user accounts or sensitive systems. Use test tokens or sanitize the signature before pasting.

What are common JWT claims?

Standard JWT claims include: sub (subject/user ID), exp (expiry timestamp), iat (issued at), nbf (not before), iss (issuer), and aud (audience). Custom claims like name, email, and role are also common.

Can I verify a JWT signature with this tool?

This tool decodes and inspects JWT content but does not verify the cryptographic signature, as that requires the secret key. Use your server-side JWT library to verify the signature properly.

About JWT Decoder

Our JWT Decoder is a free, fast, and privacy-friendly tool that works entirely in your browser. No files are ever uploaded to our servers — all processing happens locally.

Unlike competitors that impose daily limits or require account creation, FreeToolKit gives you unlimited access with zero sign-up. Whether you are a developer, student, designer, or business professional, this tool is built to save you time.