: Only confirmed friends can see full-resolution profile pictures, cover photos, and posts. Enlargement Block
Think of it like a bank vault: You can see the door (the thumbnail), but the code to open the inner safe (the high-res DP) is only available to friends. No third-party app can generate that code.
Online platforms like FVDownloader or iStaunch allow users to paste a profile link. The tool then fetches the high-resolution version of the photo directly from the CDN (Content Delivery Network).