Free · Make a random shared JSON Web Key

Symmetric JWK Generator

Generate a 256-bit secret JWK for HS256 signing or A256GCM encryption.

  • Real jose checks
  • Private in your browser
  • Copy or download the result

Generate secret key

Make a fresh key with Web Crypto. Nothing is sent away.

1Choose the key
2Check the result
Your checked result will appear hereTry the safe sample if you do not have test data.
Private by design. Keys, secrets, claims, and messages never leave this tab. Do not paste a production private key on a shared device.

Three simple steps

How to use it

  1. Choose signing or encryption.
  2. Generate a random 256-bit key.
  3. Keep the downloaded key private.

Your keys stay on this device

jose and Web Crypto do the work inside this browser tab. Bookify does not upload or save keys, secrets, tokens, or messages. A valid signature proves the input matches the key, but you must still trust where that key came from.