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When it comes to Facebook, PNG is ideal over JPEG. JPEG is already compressed when you save it and Facebook will compress it more. If you want clearer pictures on Facebook, try PNG instead. Also make sure to use the recommended size of 851 x 315px.
I expect you'll want to upload an image that is the exact size as the Facebook Cover photo, so that there is no resizing done. According to What are the dimensions for the Facebook Timeline cover photo? the dimensions are 851 × 315 pixels. (There's some other good advice in the answers to that question as well.) That said, Facebook is pretty notorious for ...
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