There are types of situations you have to crop a video on iPhone. For example, you've shot a video with your heart, but there's an unwanted object in the corner. Or the video you're going to share to social platform is widescreen, which is to be cropped to another appropriate aspect ratio. In either case, it's ideal to crop out the most focused part with the least effort on iPhone, right? Here, we will tell you how to crop videos on iPhone with its built apps, Photos and iMovie.