From the website:
First impressions matter.
That’s why SocialBook Builder makes it easy for you to make the best first impression with your YouTube videos with its easy-to-use thumbnail creator.
If you can point, click, and type, then you can create beautiful and unique video thumbnails that set you apart from your competitors.
SocialBook Builder offers numerous fonts, free stock images, and customizable templates to help you create powerful thumbnail images quickly.
