Check a wallet backup
Paste the recovery kit an app gave you. This page rebuilds the Sui address from it in your browser and sends nothing anywhere.
Rebuild the wallet
The kit holds the salt, the one part of a sign-in wallet that is not in your Google account. With it, the app's Google sign-in and any standard zkLogin prover give you the same wallet again. Developers: see Sign in with Google, Backups.