Developer Tools ›
JWT Decoder
Paste a JWT and instantly inspect its header, payload, and signature. Decoding happens entirely in your browser - your token never leaves the page.
Private - runs in your browser
No signup required
Free forever
How to use JWT Decoder
- Paste a JWT (3 base64 parts separated by dots).
- See the decoded header and payload.
- Copy individual sections.
Features
- Header & payload decoding
- Pretty-printed JSON
- Validates structure
- Browser-side
Why use it
- Debug auth flows safely
- Inspect 3rd-party tokens
- No data leaves your laptop
Frequently asked questions
Does it verify the signature?
No - verifying needs the signing secret/key. This tool decodes only.
Is my token sent anywhere?
No. Decoding is JavaScript running in your browser.