When cropping is done, click Apply in the Tools panel. When the frame handles show up, drag those in the 4 corners to resize the frame in the fixed aspect ratio, while dragging those in the middle to change without limits. To change the aspect ratio of your project, click the 16:9 under the preview window to choose one from the drop down menu. It's always a good idea to set your video project's aspect ratio before cropping, because the maximum crop size will be applied to your video or image when you click the Crop and Rotate tool in the toolbar above the timeline. All the files will be imported to the Timeline.

In the prompt screen, choose to create a New Project and then import your video to crop by clicking File > Add Media Files and choosing your video in the resulting browser. When finished, start it from desktop, Start menu, or your selected destination folder. Get the setup file saved to your computer, and open it to complete the installation process step by step. Download and Install Video Editor for Windows When cropping complete, export your video to MP4, MOV, AVI, or any other video file with high quality. It gives you the crop tool to crop your video in any aspect ratio, together with rotating your video in any angle. Movavi Video Editor is powerful Video Cropper for Windows and Mac. > Part 2: Crop A Video with iMovie on macOS (Mojave included) Part 1: Crop A Video with iMovie for Windows Alternative > Part 1: Crop A Video with iMovie for Windows Alternative No matter you're using Windows or Mac, it's possible to crop a video to be portrait, widescreen or square for sharing on Instagram, IGTV, Facebook or Twitter. Thus, a video editor like Movavi Video Editor is recommended to help you crop video in Windows. On Mac, iMovie is the free tool to get your video cropped as your want. The crop tool is also required in other scenarios like removing black bars and unwanted area on the screen. It's often necessary to crop some videos to make them all fit in a widescreen or portrait video project.

They are so called portrait (usually recorded with mobile phones) or widescreen videos (recorded or downloaded on desktop).

While making movies from lots of photo and video clips, you may have videos in various aspect ratio. How to Crop a Video to Be Square, Portrait or Widescreen

How to make imovie not crop video