When you insert media with the media upload, it will generate images of several sizes according to the media settings. But sometimes I only need thumbnails. Other times I only need medium images. If each post has images that aren’t being used, it waste space.
Is it possible to select custom image size to be generated when you open Insert Media?
Scaled images are generated at the time they are uploaded, not when inserted.
You can choose the sizes that WordPress automatically generates for images that are uploaded in your Dashboard Settings under
Settings > Media.Once an image has been inserted using
Add Media, you can click the image and then click the edit image icon that appears in the top left of the image. Go to theAdvancedtab, and you can set a new size for the image just for that post.A new image is not created for the individual post, but instead an
<img />element is inserted with the width and height specified.