One of the best things about passkeys is that they aren’t trapped on just one device. Even if you haven’t synced your passkeys through a cloud service like iCloud Keychain or Google Password Manager, you can still use your iPhone or Android phone as a “physical key” to sign into websites on any computer.
This cross-device login uses a combination of Bluetooth (to prove the phone is physically near the computer) and a QR code (to establish a secure encrypted connection).
If you aren’t already familiar with setting up and using passkeys, read this article first: A Beginner’s Guide to Passkeys: How to Set Them Up, Use Them, and Sync Across Devices
Here is how to use a passkey stored on your smartphone to sign into a website on your Windows PC or Mac.
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