While Facebook’s official interface often restricts zooming on locked profiles, these methods can help retrieve the full-resolution image: YouTube·Informative Media How to see Full Size profile pic of Locked Facebook Account
Viewing a Facebook profile picture in its full, original size depends on the account's privacy settings. While Facebook often restricts viewing to a small, cropped version (especially for locked profiles), several methods allow you to access the high-resolution image. Official Methods Direct Click facebook full link size profile picture viewer
and replace it with one of the following: cropped version (especially for locked profiles)