iMovie You can rotate photos or video clips in your Events (source video) or projects. Rotating is especially useful for reorienting images you’ve taken with your camera held sideways.
If you make a change in your source video, the change is reflected in any future project to which you add the altered video.
To rotate a photo or video:
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In the Project browser, click a photo or video clip in your project, and then press the C key or click the Crop button.
For video clips, a crop (or rotation) applies to the entire clip, even if you select just a part of the clip to modify.
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Click the right or left rotation buttons at the top of the viewer.
Each click turns the image 90 degrees. With the new orientation, the image might no longer fit the project’s aspect ratio, and black bars might appear at the top and bottom of the image (letterbox) or on its left and right sides (pillarbox).
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To crop the image so that it fits the aspect ratio, click Crop in the upper-left corner of the viewer.
Adjust the green cropping rectangle by dragging its corners or edges to show the part of the image you want. If you’re working with a photo, click Allow Black if you want to be able to keep black borders in the image when you crop.
If you want the entire image to show, click Fit instead. Some black borders might appear on the sides or on the top and bottom of the image.
Click the Play button in the upper-right corner of the viewer to preview the image.
When you’re satisfied with the image, click Done.