Contact

Never include a secret in a message.

For a useful bug report, describe your browser, device, chosen algorithm, digit count and period. Use only publicly documented RFC test keys to reproduce an issue.

Support channel

The site operator has not configured a public support email yet. A contact address will appear here when it is available. This page does not collect or submit messages.

Account help

For account recovery, lost secrets or rejected authentication codes, contact the service that owns your account. 2facheck cannot access or restore it.