Resize an image to 851x315 for a Facebook page cover
A Facebook page cover at the wrong size gets stretched or chopped, and on mobile the sides disappear entirely. 851x315 is the size Facebook uses for a page cover on desktop. The tool is already set to it.
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The Facebook page cover dimensions
851x315 is roughly a 2.7:1 aspect ratio, the size Facebook displays a page cover at on desktop. It is a wide, short banner that runs across the top of a page.
Sizing to the exact pixels avoids the blur Facebook adds when it has to scale a mismatched image. The resize tool is filled in at 851 by 315.
The desktop and mobile crop differ
Facebook shows a page cover differently on desktop and phone. On mobile the visible area is narrower, so the left and right edges of your 851x315 cover can be cut off.
Keep logos, faces, and any text in the central horizontal band. Anything you push to the far left or right risks vanishing for mobile visitors.
Keep the cover lightweight
A page cover loads on every visit, so a smaller file makes the page feel faster. After resizing, compress the result to trim the file without touching the dimensions.
The resize runs in your browser, so a draft cover for a page you have not launched yet never leaves your computer.