The dimensions of iPhone background images vary based on the specific iPhone model, but most recent devices support wallpaper sizes ranging from about 1170 × 2532 pixels to 1290 × 2796 pixels. This size ensures the image will fill the screen correctly and retain its resolution. Using a wallpaper smaller than this size can result in iOS zooming or stretching the image, which can distort it. The right size ensures your wallpaper looks neat, sharp and attractive on both the home and lock screens.