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 × 700 / 1536 × 1536 / 100 × 100 / 200 × 200 / 320 × 320 / 700 × 700 / 1600 × 1600 / 150 × 150 / 1738 × 1739