Choose from many photo sizes, iPhone resolution to wide and HD, including full size image. See it larger for more details:
Different image sizes (resolution): 700 × 340 / 1536 × 746 / 100 × 100 / 200 × 200 / 320 × 156 / 700 × 340 / 1600 × 778 / 150 × 150 / 2000 × 972