Aside from trimming the start and end of a video, there's not much you can do without installing a video editing app on your iPhone.
If you want to crop a video – to trim away some of the video to frame the scene better, to eliminate a distracting element from the edge of the frame, or just to change the aspect ratio for Instagram – you'll need to use a third-party app.
There are several video editing apps for iOS, but one free and dependable app that allows you to trim a video is called Video Crop. Here's how to use it to crop a video on your iPhone.
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How to crop a video on an iPhone
1. Install Video Crop from the App Store and then start the app.
2. The first time you run Video Crop, you'll need to give it permission to access your photos. Tap "OK."
3. Choose the video you want to crop. You can tap "All Photos" at the top of the screen and choose a different folder, such as "Videos" to find your videos more easily.
4. Tap "Crop" in the lower left corner of the screen.
5. You'll see a cropping grid appear in the video. Drag the edges of the grid to crop the video however you like, and move the grid around the screen to capture just the part of the video you want. Note that there are aspect ratios at the bottom of the screen – you can tap one of them to maintain a specific aspect ratio, like square for Instagram or 16:9 for television.
6. Tap "Done" to save the video.
7. Tap the Share button at the top right of the screen and then choose how you want to share it. You can save the video to your phone, email it, upload it to Facebook, and more.
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