Susan Wojcicki admitted in the broadsheet that "bad actors" had used the website to "mislead, manipulate, harass or even harm."
British Prime Minister Theresa May has put pressure on internet giants to root out online radical material following a spate of terror attacks, while YouTube last week pulled 150,000 videos of children after lewd comments about them were posted by viewers.
Wojcicki claimed that her company had developed "computer-learning" technology to identify extremist videos, and that it could also be used to identify content that risked children's safety.
"We will continue the growth of our teams, with the goal of bringing the total number of people across Google working to address content that might violate our policies to over 10,000 in 2018."
Media reports indicate the situation made advertisers skittish, with some halting YouTube advertising.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)