Practical guide
A Passkey Still Needs a Private Device Boundary
Understand why convenient sign-in should be created only where you control device access.
Convenience can outlast the visit
A sign-in option that removes repeated typing can be attractive on a borrowed computer. But a setup decision may last much longer than the short task you borrowed it for. Imagine using a friend's laptop to retrieve a message and accepting a prompt to create a new sign-in method. Before agreeing, ask whether you want that computer to remain part of your account access. A temporary need should not quietly become a continuing relationship between the account and someone else's device.
Understand the local unlocking condition
Google's passkey guidance warns against creating a passkey on a shared device: someone who can unlock that device may be able to access the account. The important question is therefore not just Who knows my password? It is also Who can unlock this device? Think about a shared desktop PIN, a tablet used by several adults, or a laptop left unlocked during a visit. Keep passkey setup limited to the devices and access arrangements you deliberately trust.
Do not confuse sign-out with removing access
Ending a visit and removing a sign-in method are separate concepts. Read the provider's account controls to understand which action you are taking. Do not assume that closing a window reverses a passkey you previously created. If you no longer control a device, review its associated access through the official account settings from a device you do control. Record what you removed and what remains, without putting credential material into an ordinary note or chat conversation.
Make the decision at setup time
The cleanest habit is to answer a setup prompt according to device ownership, not according to how quickly you want to finish. For a personal phone, you can consider the convenience alongside your screen-lock and recovery arrangements. For a borrowed machine, decline persistent setup and complete only the access you actually need. Passkeys are not an invitation to ignore physical access. They make the connection between account security and device control more visible, which is useful when you notice it before clicking.
Sources checked
Linked reference pages checked on 2026-09-09. Product details can change. No paid-membership test or sponsorship is implied.
Google Account Help: passkeys and shared-device warnings ↗