Google is adding a selfie video option as a new way for users to log into their accounts, the company announced Thursday, joining a growing wave of technology companies betting that biometrics, not passwords, are the future of online identity verification. The tech giant says selfie videos give users more options for logging in if they’re ever locked out or don’t have access to their regular phone or computer.

Users set up a selfie video by looking at their device’s camera and completing a few guided head movements (think turning left or right or nodding) to capture multiple angles of their face. If a user has trouble signing in later, they can take another selfie video to log back into their account, and then Google will compare the new video to the one used in settings to confirm it’s the right person.

The biggest challenge Google is trying to solve is proving that a real human being, not a robot or manipulated video, is on the other side of the camera. “When you use a selfie to sign in, we use multiple layers of security to help prevent phishing attempts, such as fake photos and videos (i.e. deepfakes),” Google wrote in a blog post. “For example, we compare your video to your saved selfie and ask you to make simple movements to prove it’s live video. We also use our standard security practices to detect and help prevent suspicious login attempts.”

However, it’s not just about individual accounts. As AI-generated videos become more compelling, “liveness” checks are becoming a basic requirement for any company that handles logins, payments or sensitive data.

While the new option could help protect accounts from fraud and help users recover locked accounts, it also raises concerns around user privacy and biometric data collection, an area that regulators have increasingly scrutinized as more companies build products around facial and voice data.

Google says that selfie videos are stored securely using encryption and remain protected even when not in use, and that users can choose to delete videos from their Google Account at any time.