:

Only mutual friends can see posts where the user is tagged.

The vast majority of online "viewer" tools are clickbait. Facebook’s servers are encrypted and highly secure. A third-party website does not have the administrative power to override user privacy settings on Meta’s servers. When a user enters a profile URL into one of these sites, the tool usually simulates a "hacking" process or loading bar, only to ask for human verification (surveys, app downloads) before revealing the content. Once the user completes the survey, the site generates revenue, and the "revealed" profile is usually either fake, generic, or simply the public info anyone could see.

The risks of using these tools are substantial:

This is a legitimate privacy feature, not a bug or loophole to be exploited.

These tools are almost always scams that either phish your credentials or install malware. They simply do not have the capability to breach Facebook's security.

The short answer is . Online tools claiming to be "Facebook locked profile viewers" do not work.