If you look closely at a copied Facebook CDN link, you will see parameters like: oh= (The cryptographic hash signature) oe= (The expiration timestamp)

A: No. Facebook compresses all profile pictures. The largest you can get is approximately 960x960 pixels.

This comprehensive guide will walk you through how Facebook profile pictures are stored, how to access them natively, and the reality of using "viewers" for private or locked profiles. Understanding Facebook Image Hosting (FBCDN)

https://platform-lookaside.fbsbx.com/platform/profilepic/?asid= [PROFILE_ID] &height= [SIZE] &width= [SIZE] &ext= [TIMESTAMP]