If you are on a desktop, you can sometimes find the image URL hidden in the site's code. Right-click on the cover photo area and select .
If you truly want a cover photo from a locked profile, the best and most ethical way is to . Once accepted, you can simply click the photo and use the built-in download option to save it in its original quality. Lock your Facebook profile | Facebook Help Center download facebook cover photo of locked profile
Many websites claim they can "unlock" profiles or download full-size images from locked accounts. If you are on a desktop, you can