Preview video calls with Knock Knock

When you call someone using Duo, the other person can see live video of you while their device rings if they have you as a contact. You won't be able to see the person you're calling until they answer.

Important: Knock Knock is available for Google Duo 1:1 and group video calling. Knock Knock isn't available when you join a meeting in the Duo app. Learn more about changes to Google Duo.

Turn on Knock Knock

To turn on Knock Knock on Duo for web:

1. On your computer, go to duo.google.com.
2. In the top right corner, click Settings .
3. Turn on Knock Knock. 

To turn on Knock Knock on a Chromebook:

1. On your Chromebook, open the Duo app .
2. In the top right corner, select More options   Settings Knock Knock.
3. Turn on Knock Knock.

Can't see video preview for incoming call

If you can't see a video preview when someone calls you, the other caller has Knock Knock turned off or they're not in your contacts.