: Facebook uses secure authentication tokens. If you aren't an approved friend, the server literally will not send the high-resolution photo data to your browser.
Technically, it is impossible for a third-party website to "unlock" a private photo due to Facebook's core architecture: facebook locked profile picture viewer online verified
: You may be forced to complete endless surveys that generate money for the scammer but never show you the photo. : Facebook uses secure authentication tokens
If a profile is locked, the only official and safe ways to see content are: facebook locked profile picture viewer online verified
: Occasionally, older public versions of a profile picture might be indexed by Google Images if the user only recently turned on the lock feature. How to Protect Your Own Profile