ImageResize is a simple plugin for creating small copies of an image when it is uploaded by standard media manager.
All what you need to do - is install and configure just as you like. The ImageResize will do everything itself.
There are four different versions of images you can configure: small, medium, medium-large and large.
You can create all thumbnails together or create only what you need.
You can even just disable the creation of thumbnails when downloading and enable only Drag&Drop.
Supports the processing and insertion of images into the editor with the Drag&Drop, creates resized image and place in editor instead fullsize.