1640 x 856 pixels is the size most commonly cited for Facebook group cover photos — the wide (~1.92:1) canvas the desktop group header displays. Facebook crops covers differently between desktop and mobile, so this size is best treated as the working canvas, with essential content kept centred.
1640
width (px)
856
height (px)
~1.92:1
aspect ratio
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Facebook group cover photos display at roughly 1640 x 856 on desktop — the size most sizing references quote for group headers.Uploading at this size means the desktop view shows your composition as designed, rather than an automatic crop of a differently shaped photo.
Facebook shows cover photos at different crops on desktop and mobile — the mobile view typically trims the sides of the image.Keep faces, text, and logos in the centre of the canvas and treat the outer edges as expendable; that way both crops look intentional.
At about 1.92:1, this canvas is close to the shape of link preview cards and other wide header placements, so the same composition adapts easily to those uses.For Facebook surfaces with their own published spec — like event covers, where larger 16:9 exports are common — check the current guidance for that specific placement.
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It's the size most commonly cited for Facebook group cover photos, matching the desktop group header display. The same wide canvas gets referenced for other Facebook cover placements too.
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