JWT Decoder

Paste any JSON Web Token to instantly decode the header and payload, inspect claims, check expiry, and verify HMAC signatures.

No data leaves your browser
JWT Token
Token

Need JWT encoding too? Open the full JWT Suite →

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used to securely transmit information between parties as a JSON object. It consists of three base64url-encoded parts: header, payload, and signature, separated by dots.

Is this JWT decoder free?

Yes, completely free. No signup or account required.

Is my JWT token safe?

All decoding happens entirely in your browser. Your token is never sent to any server.

Can this tool verify JWT signatures?

Yes. Enter your HMAC secret key and click Verify to check HS256, HS384, and HS512 signatures using the Web Crypto API in your browser.