Most third-party tools marketed as "locked profile viewers" claim to bypass Facebook's privacy settings to show you full-sized images.
While the curiosity is natural, using unauthorized viewer tools carries significant risks: Lock your Facebook profile | Facebook Help Center fb locked profile cover photo viewer
: Some tools use public Facebook data that may have been indexed before a profile was locked. Most third-party tools marketed as "locked profile viewers"
Despite these robust protections, many people search for a "fb locked profile cover photo viewer" to bypass these restrictions. 1. How "Viewer" Tools Claim to Work fb locked profile cover photo viewer