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JWT Decoder

Paste a JWT below to decode, validate, and verify locally in your browser.

Demo algorithm
>_ JSON Web Token (JWT)

JWT must not be empty.

Paste or generate a JWT to see decoded header and payload.

JWT signature verification (optional)

 

Verification uses the Web Crypto API in your browser only. Secrets and PEM keys are never uploaded.

▸About this tool

Decode and inspect JSON Web Tokens: view the header, payload claims, and expiration date. Runs entirely in your browser.

▸Privacy and details

Your files never leave your device.

Fast browser processing with no account required.

Optimized for desktop and mobile with accessible controls.

▸How to use
  1. Paste a JWT (three dot-separated Base64URL parts) into the input field.
  2. The header, payload, and signature sections decode automatically.
  3. Check the expiration status: the tool shows if the token has expired.
  4. Copy the decoded payload for use in your code or debugging.
▸Why use this tool

Debugging authentication issues requires quickly inspecting what a JWT actually contains. This tool decodes any JWT instantly without sending it to a server, making it safe to use with tokens from staging environments.