JWT Decoder
Decode and inspect JSON Web Token header, payload, and signature instantly.
Header & payloadAuto decodeNo signup
Text stays on your device
Documentation
What is JWT decoding?
JWT decoding splits the token into header, payload, and signature, then Base64-decodes each part into readable JSON.
When do you need it?
Debugging auth flows, inspecting token claims, checking expiration dates, and verifying user roles.
How to use
- 1) Paste your JWT token into the input box.
- 2) The header, payload, and signature are decoded instantly.
FAQs
What is a JWT token?
JWT (JSON Web Token) is a compact means of representing claims. It has a header, payload, and signature.
What does a JWT decoder do?
It Base64-decodes the header and payload into readable JSON.
Does it verify signatures?
No. This tool only decodes the header and payload. It does not verify the cryptographic signature.
Does it store my tokens?
No. All decoding happens locally in your browser. Your tokens are never uploaded or stored.
Is it free?
Yes. The JWT decoder is completely free with no signup or limits.
Privacy: All processing runs in your browser. Nothing is stored.