JWT Decoder
Decode JWT header and payload in your browser. Inspect claims instantly — decode only, no upload, free online JWT decoder.
Decode a JWT privately in your browser
Paste a JWT to inspect its header and payload claims. Decoding is local only — useful for debugging auth tokens without sharing them.
What you can do with it
- Debug an auth token
- Check expiry (exp), subject (sub), and custom claims without calling a remote debugger.
- Confirm algorithm and type
- Read the header to see alg and typ before wiring verification elsewhere.
How to decode a JWT
- Paste the JWT into the input.
- Click Decode to view header and payload as JSON.
- Copy the parts you need — signature is shown but not verified.