Your Page's cover photo: 1  Displays at 820 pixels wide by 312 pixels tall on your Page on computers and 640 pixels wide by 360 pixels tall on smartphones. 2  Doesn't display on feature phones. 3  Must be at least 399 pixels wide and 150 pixels tall.  Loads fastest as an sRGB JPG file that's 851 pixels wide, 315 pixels tall and less than 100 kilobytes.