Free JWT Decoder

What is this JWT decoder?

A fast way to inspect JSON Web Tokens (JWTs). This tool base64url‑decodes the header and payload so you can verify claims, audiences, and expirations at a glance. It does not verify signatures or secrets, and nothing is sent to a server—everything runs locally.

How to use it

1. Paste a JWT in the format header.payload.signature.
2. Click Decode to view pretty‑printed header and payload JSON.
3. Check claims like exp, iat, aud, and iss.

Tips

• Payloads are not encrypted; treat decoded data as public.
• Signature verification is not performed—use your backend or a library for that.
• Expired tokens (exp) should be rejected by servers.

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Privacy: runs entirely in your browser—no data is sent anywhere.