Each of these 4K wallpapers (that's 3840x2160, pixel fans) has been set to a desktop-friendly 16:9 aspect ratio, and with minimal compression so they look super sharp on your monitor.

There are many wallpaper websites that provide free 4K wallpapers on their sites. However, this article will be covering only two highly reputed sites called Unsplash and Pexels. Both the sites ...