The MP4 file format was developed by the Moving Picture Experts Group (MPEG). This format is most commonly used for mobile devices, but it is also quite common on personal computers. A feature of MP4 files is the different type of compression for audio and video files. To play a file of this format, almost any video file player will suffice. For example, ALLPlayer or GOM Media Player. If any of these multimedia players are installed on your PC system, you don't need to worry about what to open MP4 on a computer with. Most players have a wide range of settings. They may also include online video viewing features. But still, returning to the question 'What to open MP4 with?', it is worth noting KMPlayer or PotPlayer. These players will easily allow you to not only view files of this format but also enjoy many other functions. In the list of programs on our website, you will find many programs that allow you to open video files of various formats. If you still don't know how to open mp4 video, feel free to install any program from this list.