If you want to loop a video on your iPhone, you can do so using the built-in editing tools in the Photos app. Follow these steps:

Step 1: Open the Photos app and select the video you want to loop.

Step 2: Tap on the “Edit” button in the upper right corner of the screen.

Step 3: At the bottom of the screen, you will see a timeline of the video. Tap and hold the left or right end of the timeline and drag it inward to shorten the length of the video.

Step 4: Once you’ve shortened the video to the desired length, tap on the “Loop” button in the lower left corner of the screen. This will loop the video continuously.

Step 5: If you want to save the looped video as a new video file, tap on the “Save” button in the upper right corner of the screen.

Step 6: If you want to discard the changes and keep the original video, tap on the “Cancel” button.

That’s it! You can now enjoy your looped video on your iPhone.