Legitimate technical loopholes exist—mostly involving viewing the thumbnail of the profile picture in a higher resolution through direct URL manipulation—but these are increasingly patched by Meta. The cat-and-mouse game between privacy features and viewing tools is now a spectator sport in tech communities.
Facebook's "Locked Profile" feature is a privacy tool designed to restrict content visibility—including full-size profile pictures (DPs)—to anyone who is not on the user's friend list. While many "locked profile DP viewer" tools claim to bypass these restrictions, they are frequently associated with significant security risks. fb locked profile dp viewer hot