It is recommended to design Facebook cover photos with a size of 851×315 pixels, which is the best choice to ensure good display on both desktop and mobile devices; 1. The recommended size of the desktop is 820×312 pixels, and the mobile device is 640×360 pixels, but the mobile terminal display is narrower, so important content needs to be centered; 2. Using a high-resolution image of 851×315 pixels can avoid blur or stretching and provide cropping margin; 3. The key content should be placed in the center security area to avoid being cropped near the edges; 4. The image format should be saved as JPG or PNG to ensure compatibility; 5. The correct size can ensure that the cover image is clearly and professionally displayed on all devices, improving the overall visual effect.
A Facebook cover photo should be 820 pixels wide by 312 pixels tall for desktop displays. However, since the cover photo appears differently on mobile devices, it's best to design with some flexibility in mind.

Here are the key details to keep in mind:
Recommended Dimensions
- Desktop: 820 x 312 pixels
- Mobile: 640 x 360 pixels (appears taller on mobile, so important content should be centered)
Facebook actually recommends uploading a larger image (up to 851 x 315 pixels ) to ensure quality across devices and screen sizes. This slightly larger size gives you a small buffer for cropping and prevents pixelation.

Tips for Best Results
- Use high-resolution images (minimum 820 x 312, ideally 851 x 315)
- Keep critical content (like text or logos) centered and within the safe zone
- Avoid placing important details near the edges—these may get cropped on mobile
- Save as JPG or PNG for best compatibility
Why Size Matters
If your image is too small, it may appear blurry. If it's too narrow, it can stretch or leave gaps. Using the correct dimensions ensures your cover photo looks professional and displays properly for all viewers.
Basically, aim for 851 x 315 pixels when designing—it's the safest bet for both desktop and mobile.

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