In most cases, the aspect ratio of the photo taken is the cause of cropping. Traditional cameras and photo sizes are in a 3:2 aspect ratio, making them perfect for a 4x6 photo sizes; however, cell phones take photos at a 4:3 aspect ratio, which shortens the photo. This will cause the photo to have to expand proportionally to fill the 3:2 aspect ratio and will leave a margin to be trimmed off the edges of your photos. Please check your photos before printing to make sure that nothing important gets cropped off.