When Google Stadia first rolled out, streaming in 4K was limited to TVs via Chromecast Ultra. But now, the company is extending support to users on the web. Some Stadia users have started to get the update. To take advantage of this feature, you will need to have a Stadia Pro subscription, which costs $11.99, and you will need to enable 4K streaming from the Stadia mobile app. To check your streaming resolution, open the in-game menu, click "Connection," and look for a "4K icon underneath "Data usage." While 4K is supposedly limited to a minimum connection speed of 35mbps or rated as "Excellent," 9to5Google reports that it's gotten 4K to run at speeds rated as "Good" or "Ok."