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About this tool
Build Facebook page, profile, group and event covers with a safe zone that survives both the desktop and mobile crop.
Facebook Cover Size Generator works out the region of a cover photo that survives both the desktop crop and the mobile app crop, then exports the image at the correct upload size. Facebook fills each display box with a centred cover crop, so a 851 x 315 profile cover keeps only its central 560 px across both views, and a 1640 x 624 Page cover keeps about 1109 px. Designers and page owners get a measured safe zone instead of guessing where a headline will get cut.
Open Facebook Cover Size Generator on AltFTool — it loads instantly in your browser.
Provide your input — an image, text, or data.
Let the tool analyze or generate the result.
Review, refine, and reuse the output wherever you need it.
The safe zone is the geometric intersection of the desktop and mobile cover crops, computed from the display sizes.
The download is rendered at the exact upload dimensions so Facebook does not resample it a second time.
The photo is decoded and drawn on a canvas in your browser; nothing is uploaded anywhere.
A personal profile cover is 851 x 315 px. A Page cover displays at 820 x 312 px on desktop and 640 x 360 px in the app, so uploading at 2x — 1640 x 624 px — keeps it sharp on retina screens.
Desktop and mobile use different aspect ratios, and Facebook fills each with a centred crop. The desktop strip is roughly 2.63:1 while the mobile strip is 16:9, so the app shows a narrower slice of the same file — about 66% of the width on a Page cover.
Inside the centred safe zone. On the classic 851 x 315 cover that is the middle 560 px; on a 1640 x 624 Page cover it is the middle 1109 px. Also leave the lower-left corner clear where the profile picture overlaps on desktop.
Use JPEG for photographic covers — Facebook recompresses uploads, and a JPEG at quality 0.9 already matches what the platform will store. Use PNG when the cover is flat colour, a logo or contains small text, where compression artefacts around edges are more noticeable.