Which crop type do you need?
Pick by what you want the output to look like. Circle for profile pictures, avatars, contact thumbnails — produces a round image with transparent corners. Rectangle for trimming edges or matching any aspect ratio. Aspect-ratio presets (1:1, 16:9, 9:16, 4:5) lock the selection so the output fits the exact proportions you need. Social-media presets load the standard platform dimensions at the start — no need to remember the numbers.