Clipboard, browser extension, or universal autofill for macOS web pages - which is safest

Baz,

Typically, when you copy to the clipboard, you run an increased chance that data might get intercepted because the clipboard is accessible to any app on your device and if that data gets pasted into the wrong areas.

That's one reason why 1Password offers different filling options on various platforms (including the 1Password browser extension, and Universal Autofill on the Mac) to help you fill in rather than having to copy and paste the credentials. This is why autofill is 1Password's default option.

If you are concerned about disreputable processes on your computer and how those can impact 1Password, I recommend checking out this blog from our Security team: https://blog.1password.com/local-threats-device-protections/.

-Evon