vlc

VLC is a free, completely ad-free app that plays almost any video or music file on your computer, phone, or tablet. It acts like a digital "Swiss Army knife" because it opens rare or stubborn files that other players reject, all without forcing you to download extra software. Beyond just playing videos, VLC can also fix out-of-sync subtitles, speed up or slow down playback, and even convert video files into audio tracks. It is run by a non-profit company, meaning it never tracks your data, costs nothing to use, and works smoothly on Windows, Mac, Android, and iPhone.