Turn your WordPress media thumbnails to the next level with fast regeneration. Single or bulk regenerate images and create a custom thumbnail upload structure with this unique plugin. RTG (Real Thumbnail Generator) allows you easily to regenerate all your (existing) thumbnails in your media library. You can regenerate a single or bulk images. Also, it allows you to create a custom upload structure for thumbnails. The regeneration of thumbnails can up to be 33 % faster than other plugins. Another helpful feature is, that unused image sizes can be detected and deleted, for example if you have switched the WordPress theme. Just install this plugin and it works fine with all your image and media files. It also supports multisite.