DownDetector.com, a website which monitors outages, showed nearly 286,000 incidents of people reporting issues with the service.
The issue started at around 6:53 p.m. ET (23:53 GMT), according to Downdetector.com, with users complaining about trouble in watching videos on the platform.
“We’re so sorry for the interruption. This is fixed across all devices & YouTube services,” YouTube said in a tweet, without explaining what had caused the outage.
Google did not respond to a Reuters request for comment on the outage.