As the most popular and most compatible video format, MP4 is often used in daily life. Not surprisingly, you may have many MP4 files stored on your Mac computer but urgently need a way to trim. How to effectively and accurately trim MP4 on Mac to remove clips that you dislike, such as advertisements, unwanted scenes, etc.? Or how to simply trim videos on Mac to refine video content and shrink the file size? If you don't know, let us answer your questions in this post by offering the optimal solution below.