If you are looking to see how your own profile picture appears to others, or want to test images before uploading, Social Previewing provides a dedicated mockup tool. It allows you to see how your photo looks on both mobile and desktop before you make it live. Personal brand management and photographers.
: A Chrome extension that allows users to right-click a profile to "Unlock full size profile picture" for Facebook, Instagram, and TikTok. Facebook ID Grabber
Never download .exe or .apk files claiming to be Facebook viewers; these are often malware.
Be skeptical of tools that promise to show private, restricted, or locked profiles, as these are often phishing scams.