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How to Shorten a Video on iPhone? A Step By Step Guide. Shortening a video on an iPhone is a simple process that can be done using the built-in Photos app, eliminating the need for third-party editing software. To trim a video, start by opening the Photos app and selecting the video you want to shorten. Tap Edit in the top right corner, and you’ll see a timeline of the video appear at the bottom of the screen.