How to set thumbnail image for a (child) theme

Create image file in PNG Format having name screenshot.png and save it in themes root folder.The recommended image size is 880×660. Even recommended image size is 880×660 though it will only be shown as 387×290 but the double-sized image allows for high-resolution viewing on HiDPI displays. For more information see this page. If you don’t … Read more

Generating Thumbnails for video

You can use the oEmbed functionality baked into WordPress. Typically any video host on this list will return a thumbnail to you using oembed. Here is a list of default providers that WordPress uses for auto embedding in the content area. I’ve included non-video sources as well for the convenience of others. http://www.youtube.com/oembed http://blip.tv/oembed/ http://vimeo.com/api/oembed.xml … Read more

How to disable WordPress from creating thumbnails?

To built on Max Yudin’s answer you should use the intermediate_image_sizes_advanced filter, and not image_size_names_choose. Add to functions.php function add_image_insert_override($sizes){ unset( $sizes[‘thumbnail’]); unset( $sizes[‘medium’]); unset( $sizes[‘large’]); return $sizes; } add_filter(‘intermediate_image_sizes_advanced’, ‘add_image_insert_override’ ); Another easier option I think works is going to your Settings–>Media and setting each box for width and height to 0