JWT Tools
Decodes and validates JWT tokens for debugging and security analysis. It extracts claims, expiration details, and verifies signatures if applicable.
Encode
Decode
Header
Body
Secret
JWT Tools — Free Online Tool
Decodes and validates JWT tokens for debugging and security analysis. It extracts claims, expiration details, and verifies signatures if applicable.
How to use the JWT Tools
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
What is a JWT and what are its three parts?
A JSON Web Token is a compact, URL-safe token made of three Base64URL parts joined by dots: header, payload, and signature. This tool decodes the header and payload so you can inspect their claims.
Can I verify a JWT signature with this tool?
You can decode the header and payload of any JWT, but signature verification requires the secret or public key. Never paste a production secret into an online tool — decode only.
Free & private — why use this JWT Tools
The JWT Tools runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.