If a profile is private or locked, you can only see limited information such as the profile name, a small version of the profile picture, and basic "About" info.
Facebook’s architecture is built on a strict permission system. When a user sets their profile to “Private” (or “Friends Only” for specific content), Facebook’s servers simply refuse to serve that data to anyone not authenticated as a Friend. There is no backdoor, no “viewer app,” and no secret API that bypasses this. facebook private profile viewer free
Stay safe, stay skeptical, and never—ever—enter your Facebook password on any site other than https://facebook.com . If a profile is private or locked, you