How Does It Work?
When you create a profile photo from an existing album image, Facebook lets you crop the photo down to whatever dimensions you choose. When you visit your profile the selected photo is displayed scaled down to a maximum height and width allowed by Facebook.
The first thing you need to understand is how much space you have to play with. Facebook displays profile photos at a maximum of 200 pixels in width. If you go beyond this, Facebook resizes your profile photo down to 200 while maintaining the aspect ratio vertically. Facebook will display a photo in your profile that is up to 600 pixels in height. This means that Facebook will happily display any image as large as 200 x 600 without otherwise changing or resizing it.
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