JWT Decoder & Inspector

Decode JWT headers and payloads and inspect expiry claims locally.

● Runs locally in your browser. No file or text uploads.

Inspect a token without sharing it

A token with exp in the past is marked Expired. Decoding only reveals claims; it never authenticates the token.

Read expiry without trusting the token

The exp claim is a Unix timestamp in seconds. A decoded payload can show a future expiry even if its contents have been modified. Only signature verification and checks such as issuer and audience validation can establish whether your application should accept it.

When to use it

Decode JWT headers and payloads and inspect expiry claims locally.

About this tool

Decode JWT headers and payloads and inspect expiry claims locally. Use it without creating an account. Results are available immediately, and inputs are not saved between visits.

Does this send my input to a server?

Inputs are processed locally. Optional Analytics sends page statistics only after consent; tool inputs and files are excluded.