All thumbnails are created automatically. We want to ensure that every single website is fully optimized to the maximum so we enforce resizing of the images to match the size that's being used by a website. In addition, most images will be converted to the ".webp" format which are smaller in size and load up much faster. If you need help creating a specific thumbnail images for your website, contact us and we will gladly crop the images for you so that everything looks exactly the way you need it to.