Viewer - Photos - Cropping

Photos can be cropped at any aspect ratio with the default being the native aspect ratio of the photo. Cropping the photo is done by switching to the cropping mode of the photos section. Tap and drag the corners of the crop box to modify the crop of the photo.

The most common aspect ratios are available as presets at the top of the keyboard or you can type in your own custom one. If a display size is assigned, changing the aspect ratio to something else will clear the display size setting.