Just move your mouse over the photo — the focus follows it and the previews update as you go. Click to lock it on the subject. Your picture is saved as a square around this point, so it is never squashed to fit.

Just move your mouse over the photo — the focus follows it and the previews update as you go. Click to lock it on the subject. Nothing is cut from your photo; this only decides what stays centred when it is shown in a smaller shape.

Just move your mouse over the photo — the focus follows it and the previews update as you go. Click to lock it on the subject. Your image is saved at the shape shown on the right, cropped around this point.