What it means
A Windows Hello PIN is a device unlock gesture tied to that PC. A passkey for a website is a credential whose private key is held on the chosen device or credential manager. When the passkey is saved on the Windows device, Windows Hello confirms that the authorized person is present; the website gets an origin-bound cryptographic response, not the PIN or face data. A synced passkey manager or phone uses a different storage and recovery path.
A real-world example
A person creates a passkey for a shopping account and chooses Windows device. Their fingerprint opens the local credential. On a new laptop, that local passkey does not magically appear; they need a separately stored passkey or the site's recovery route.
What to do
Choose the save location deliberately, test a sign-in and keep an independent way back in. Protect the Windows login and remove lost-device passkeys from the service account when necessary.
The distinction that matters
The PIN is not the passkey and changing a PIN does not by itself transfer the key to another PC. A passkey reduces fake-site credential theft, but someone who controls your unlocked device or account recovery channel can still cause harm. Before wiping or selling the PC, confirm another sign-in method works and inspect the website's passkey list so an obsolete credential can be removed safely.
Microsoft passkey creation
