

If you don’t already have it, download iMovie to your Mac. How to Change the Aspect Ratio in iMovie on a Mac That’s why it might be easier to make the change on a Mac and work on a larger screen. It might be challenging to crop the video precisely with your fingers, and you might have to go back to the app to adjust the dimensions again. When it comes to the aspect ratio you choose, it depends on the platform where you plan to share the video. You can also use the AirDrop feature to share it with other devices. You can share the video to iCloud Drive, Mail, and Messages directly from the app. The video will be saved in your iPhone’s camera roll. When you’ve finished, select Done in the upper-left corner of your screen.

To enlarge the video, drag your fingers to the outer edges of your screen. To make the video’s dimensions smaller, pinch towards the center of the screen.
