Description Regenerate Thumbnails allows you to regenerate all thumbnail sizes for one or more images that have been uploaded to your Media Library. This is useful for situations such as: A new thumbnail size has been added and you want past uploads to have a thumbnail in that size. You’ve changed the dimensions of an existing thumbnail size, for example via Settings â�� Media. You’ve switched to
![Regenerate Thumbnails](https://cdn-ak-scissors.b.st-hatena.com/image/square/643ea29342ea3541732a8d480aa4465881296431/height=288;version=1;width=512/https%3A%2F%2Fps.w.org%2Fregenerate-thumbnails%2Fassets%2Fbanner-772x250.jpg%3Frev%3D1753390)