The internet is full of "private profile viewer" tools, but they consistently fail to deliver on their promises for several technical and security reasons:

Facebook uses server-side permissions to control who can see a profile. A third-party "repack" app running on your computer cannot bypass Facebook's internal servers to fetch private photos or posts. Any site claiming to have a "backdoor" is likely trying to exploit the user instead.

: Some installers bundle adware or "bloatware" that tracks your browsing habits and sells your digital identity to third parties. Why They Don't Work