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): 128 × 82 / 400 × 256 / 700 × 448 / 1536 × 984 / 2048 × 1312 / 100 × 100 / 200 × 200 / 320 × 205 / 700 × 448 / 150 × 150 / 2240 × 1435