The video features scenes of the pop star at different points in time. Then all of the versions of Swift -- including the time when Kanye West interrupted her speech at the VMAs, and even the singer portrayed as a corpse -- line up in a straight line.
In the final scene of the video, one of the Taylor's says to the other: "There she goes playing the victim again." Another responds in kind, "Shut up!"
Swift, 27, has been teasing and hinting all week on her social media accounts that new music was coming.
After dropping her dark new song, about a woman getting back at an old friend or lover, late Thursday night, "Good Morning America" teased images from the Joseph Kahn-directed video Friday.
The music video caused headlines before it was even released thanks to those images.
Beyoncé's fans cried foul, saying that one shot, in which Swift is wearing all black inside a Victorian-style home, felt similar to Beyoncé's "Formation" video, in which she at one point also wears all black in a plantation-style home.
Kahn defended the music video on Twitter Friday, writing: "I've worked with Beyoncé a few times. She's an amazing person. The #LWYMMDvideo is not in her art space. Love and respect to Bey."
"Look What You Made Me Do" is the first single from the Grammy Award-winning artist's album "Reputation," out Nov. 10.