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 × 394 / 1536 × 864 / 100 × 100 / 200 × 200 / 320 × 180 / 700 × 394 / 1600 × 900 / 150 × 150 / 1665 × 937