Thumbnails are usually the first thing viewers see when they find one of your videos, and 90% of the best-performing videos on YouTube have custom thumbnails.

If you take a good look, all the major YouTubers are using their custom thumbnails for making their videos catchy and to get more clicks and views. This makes their video stand out from even videos that might have more views or be more popular. Great Youtube thumbnails catch viewer’s attention and get more views which means more money/revenue!