The current profile picture and the current cover photo. What you cannot see: Previous profile pictures (if the user has set their "Past Profile Pictures" album to Private).
Executable files named “FacebookPrivateViewer.exe” or “FBPhotoHack.apk” are often remote access trojans (RATs) or spyware. Once installed, they can: view private facebook photos without being friends
Under 18 U.S.C. § 1030, accessing a computer system (Facebook’s servers) “without authorization” or “exceeding authorized access” is a federal crime. Penalties include: The current profile picture and the current cover photo
Websites claiming to be "private profile viewers" usually have malicious intent. view private facebook photos without being friends