Your fingerprint unlocks a keyYour device creates a unique cryptographic key for this site.
Your fingerprint, face, or screen lock unlocks it — but the key
itself is what signs you in.
It syncs across your devicesiCloud Keychain, Google Password Manager, or your password
manager keeps it in sync. New phone? Your passkey is already
there.
Can't be stolen or phishedUnlike a password, a passkey can't be typed, copied, or tricked
out of you. It only works on the real site — fakes are ignored
automatically.