Does this tool verify the JWT signature?

No. It only decodes and displays content.

Can someone read my JWT without the secret?

Yes. Payload is Base64URL-encoded, not encrypted.

Check the exp claim (Unix time) against current time.

Decode and inspect JSON Web Tokens (JWT) to view header, payload, and signature info.

JWTJSON Web Tokendecodeauthenticationtoken

JWT Token

Note: This tool only decodes the JWT—it does not verify the signature. Always verify signatures server-side before trusting token contents.

A compact token format for auth: header.payload.signature.

Decodes parts for debugging.

Decoding is not signature verification; always verify server-side.

Quick answers about usage, privacy, and best practices.

Privacy: Everything runs locally in your browser. No data is sent to a server.

Encode text to Base64 or decode Base64 strings back to plain text.

Format, validate, and beautify JSON with error detection.

Generate secure API keys with custom prefixes, formats, and lengths for your applications.

Privacy First: This tool runs entirely in your browser. No data is sent to any server.