If a user has locked their profile, Facebook strictly limits what non-friends can see. Here are the only reliable methods:

If you believe the person may not recognize your name or profile picture, you can send them a polite message via Facebook Messenger. Explain who you are and why you are reaching out. Note that if you are not friends, your message will likely enter their "Message Requests" folder, so it may take time for them to see it. Leverage Mutual Friends

Platforms often prompt visitors to download specialized application packages (APKs) or browser extensions. These files typically contain spyware that tracks your real-time keystrokes.

Are you trying to or an entire post history ?

: Tools like iStaunch or certain Fiverr services claim to help you view or download full-size profile pictures, even from locked accounts, by using the profile URL.

If you have a legitimate reason to contact the individual (such as marketplace inquiries or mutual networking), you can send them a direct message on Facebook Messenger. Even if their profile is locked, they will receive your message as a "Message Request" and can choose to respond or share details with you directly. 3. Check for Shared Mutual Friends

It is the simplest, safest, and most direct method. While it may feel intimidating, sending a friend request is not illegal or unethical. If the person accepts, the "locked" door opens to you. If they do not, you have your answer without compromising your computer security.