JWT Decoder — Decode JSON Web Tokens
Decode and inspect JWT tokens to view header and payload.
Paste JWT Token
Your token is decoded locally in your browser. We never see it.
JWT Structure
A JWT consists of three parts separated by dots:
header.payload.signature
- Header: Token type (JWT) and signing algorithm
- Payload: Claims (user data, expiry, etc.)
- Signature: Cryptographic signature for verification
💡 Your token is decoded entirely in your browser. We never send it to any server.
Frequently Asked Questions about JWT Decoder
- Is JWT Decoder completely free to use?
- Yes, JWT Decoder is 100% free with no sign-up, no watermarks, and no usage limits.
- Are my uploaded files safe and private?
- Yes. Files are uploaded over HTTPS, processed securely on our servers, and permanently deleted immediately after your download. We never store, view, or share your files.
- What is the maximum file size?
- You can upload files up to 1 MB. For larger files, consider compressing or splitting them first.
- Is my sensitive data processed locally?
- Yes, all cryptographic operations run in your browser using the Web Crypto API. Your keys and secrets never leave your device.
- Does JWT Decoder work on mobile and tablet?
- Yes, JWT Decoder is fully responsive and works in all modern browsers on desktop, tablet, and mobile.
Files are processed securely and permanently deleted after download. Never stored or shared.