Common aspect ratios
Use 1:1 (square) for profile photos and feed posts, 4:5 for portrait posts, 9:16 for stories and short videos, 16:9 for covers and video thumbnails, and 3:2 and 4:3 for ordinary camera photos. Choosing a ratio locks the crop box so its shape does not change when you drag it.
For a very specific size, type the X, Y, width and height numbers in the fields provided. Fill in Output width if the crop needs to be scaled down to a certain width.