Add more space to photos on iPhone and iPad How to resize photos in apps that store them on your iPhone How to adjust the aspect ratio of an image to match your iPhone's screen size, when you are not sure whether you have the appropriate resolution. There are several ways to resize photos. To learn How to iPhone and iPad: How to crop and resize Photos Learn how to crop, resize, and correct an image to match the width and height of an iPhone's screen and to make it fit to your iPhone's display, you will need to select that photo and view it in a phone and screen size simulator. The image will be automatically scaled.