The defining feature of passkeys is that they're stored in your password manager, and you can't read them, so you can't be tricked into typing them into the wrong web site.
Most password managers don't even allow you to export/backup the passkeys yourself. (Bitwarden is an exception.)
Instead, password managers support a finicky app-to-app transfer protocol called "Credential Exchange Protocol" (CXP), where you install two password managers at once, and they convey your passwords + passkeys, without ever generating a file that you can read. (And Microsoft's password manager doesn't even support CXP yet. As of today, you can only do it on Android and iOS.)
Many people read that and say, "see, that's why I'm never going to use passkeys! I'm safer managing my own backups, and I'm too smart to be tricked into copying and pasting my password to the wrong site." But they're wrong. You are not too smart to be tricked. Nobody is.
If you use the same cloud-sync password manager everywhere, passkeys just work. If you don't, you'll have to use Credential Exchange Protocol to transfer them, which is a hassle.
It’s up to you to decide whether protecting yourself from being tricked into exporting your passkeys is worth sacrificing your ability to read them.
Most password managers don't even allow you to export/backup the passkeys yourself. (Bitwarden is an exception.)
Instead, password managers support a finicky app-to-app transfer protocol called "Credential Exchange Protocol" (CXP), where you install two password managers at once, and they convey your passwords + passkeys, without ever generating a file that you can read. (And Microsoft's password manager doesn't even support CXP yet. As of today, you can only do it on Android and iOS.)
Many people read that and say, "see, that's why I'm never going to use passkeys! I'm safer managing my own backups, and I'm too smart to be tricked into copying and pasting my password to the wrong site." But they're wrong. You are not too smart to be tricked. Nobody is.
If you use the same cloud-sync password manager everywhere, passkeys just work. If you don't, you'll have to use Credential Exchange Protocol to transfer them, which is a hassle.
It’s up to you to decide whether protecting yourself from being tricked into exporting your passkeys is worth sacrificing your ability to read them.