Appy Pie’s AI YouTube Thumbnail Maker allows you to easily create customized, high-quality thumbnails for your YouTube videos. To use the tool just enter a text prompt (often your video title) or upload an image to get started. Then, choose from over 200 professionally designed templates covering a wide range of styles and themes. You can fully customize the AI-generated thumbnails by adding your own text, images, colors, and more. Please note that this tool is not free to use however there is a 7-day free trial.