Click on your current profile picture, select Edit Audience , and change it to Friends or Only Me . While the thumbnail remains public so people can find you, they will not be able to open the photo to view the full-size version, read the comments, or see the likes.

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Facebook automatically compresses and resizes profile pictures. Even if a user uploads a high-resolution image, Facebook displays it at a standard size (typically around 720×720 pixels or less on desktop, and lower on mobile).

: This paper details how third-party apps can override a user's global privacy settings once permission is granted, leading to data leakage. Source : ResearchGate . 3. Safe Ways to Manage Profile Pictures

Any tool claiming to show photos of private, locked profiles is likely a scam or malicious.

to prevent your own photos from being downloaded. Let me know how you'd like to proceed. Share public link