JWT Token Signer

Build and edit JWT payloads visually, sign with secrets, and inspect values.

Decoded Structure

HEADER: ALGORITHM & TOKEN TYPE

PAYLOAD: DATA

VERIFY SIGNATURE

HMACSHA256(

base64UrlEncode(header) + "." + base64UrlEncode(payload),

)

Fix errors in decoded section to generate token...

Map key combination entropy bits and visual brute-force crack timelines.

Mobile-authenticator simulated panel that generates and tests TOTP secrets.

Compute Keyed-Hash Message Authentication Codes client-side.