How do I decode and inspect a JWT token online?

Paste your JWT (JSON Web Token) into the input above. The tool splits the three dot-separated segments — header, payload, and signature — Base64URL decodes the first two, and displays the JSON content of each in a readable format instantly.

What information is contained in a JWT token's header and payload?

The header contains the token type (JWT) and the signing algorithm (e.g. HS256, RS256). The payload contains claims: standard ones like sub (subject/user ID), iat (issued at timestamp), exp (expiration timestamp), aud (audience), plus any custom claims added by your application.

Does this JWT decoder verify the token signature?

No. The tool only decodes and displays the header and payload — it does not verify the cryptographic signature. Signature verification requires the secret key or RSA public key, which you should never paste into an online tool. Use this tool for inspection and debugging only, not for security validation.

Is it safe to paste a JWT token into an online decoder?

Be cautious with production tokens. A JWT in the Authorization header is a bearer credential — anyone who has it can use it until it expires. This tool processes the token entirely in your browser and sends nothing to a server, but avoid pasting live production access tokens into any public web page.

Is the JWT decoder free?

Yes — free, no account needed, fully client-side.

JWT inspect

JWT Decoder

Decode and inspect JWT tokens — view header, payload, and signature. No server, no verification.

Your files are processed locally and never uploaded to our servers.

JWT Token

How it works

1
Type or paste input
Paste your value into the input field. No file needed — works directly in your browser.
2
Get instant results
The result appears in real time as you type. No server, no upload.
3
Copy the output
Click the copy button to copy the result to your clipboard instantly.

Frequently Asked Questions

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