It supports lots of different formats, like MOV files, WMV, and AVI, and it works across all major platforms and operating systems, too, including Android and iOS.
It's a free and open-source program with a very user-friendly interface, and it has many other features in addition to video rotation, such as video conversion, editing, subtitles, and more.
VLC is a popular media player which you can also use to flip, turn, tilt, and rotate videos easily on your computer, laptop, or another device.