Fotojet is an online application that allows you to create design elements without relying on a desktop application. The application is template-based, similar to many similar applications in that space. The free version will store your images in the cloud and offers a wide range of design functions, including effects that are not available in its common competitors. To create a YouTube video thumbnail using Fotojet, log in to your account. You can also create a thumbnail without an account if you prefer to remain anonymous. If you don't have a Fotojet account, you may want to create a new one. For the purpose of creating a YouTube thumbnail, the free version of Fotojet should cover most people's needs, and more.