Runs entirely in your browser. Nothing you enter is sent anywhere or stored.

How to use it

Fill in your contact details and expiry date, then copy the file to /.well-known/security.txt on your site.

How this works

  • Output follows RFC 9116. Contact and Expires are required. Web links must use HTTPS.
  • Set a reminder to renew the file before it expires. Mine is at /.well-known/security.txt.