If a website, app, or hacker claims otherwise, they are lying to you. Period.

A: You must go through legal channels. Subpoena Facebook directly. Attempting to hack or view a private profile illegally will make your evidence inadmissible in court and may result in counter-suits.

This article breaks down why most "top" free tools are dangerous, what information you can actually see, and the few legitimate (though limited) ways to view restricted profiles. The Truth About "Private Viewer" Tools

Some browser extensions are advertised as enabling private profile viewing. These extensions often request access to the user's Facebook account and browsing history.