Carlos Minatti

Delete Original Image is a WordPress plugin to delete the the original image file uploaded.
The problem that solves, is that the original image file is usually huge (can be >6MB if it is a photograph) and it is never published on the pages, so there is no need to keep it on your server, and it it a must to delete it, if you have limited storage space and you are uploading tons of pictures.
The plugin gives you the option to enable/disable this, to be done automatically when you upload an image.
And/or you can do it in bulk for all your previously uploaded images.
Specifically, this plugin copy the ‘large’ image ( i.e: your-pic-1038×576.jpg ) to the original file path ( i.e.: your-pic.jpg ).
Nothing should brake, all other plugins should keep working, but you need to know that the original image is no longer available on your site, so please do a backup if you think you may need the original images in the future.

Delete Original Image

This plugin allows you to automatically delete the original image after upload, or do it in bulk for old images.

ixthus27

The Image Size Selection plugin is designed to add all available image sizes to your Media size selection drop down window. By default, windows generates a Large, Medium and Thumbnail image size (See Settings/Media for your setting sizes). Most modern themes, however, include a wide range of additional sizes.
Most themes had the add_image to the functions.php file, which adds additional images to your site. These are often used in widgets or specially designed areas of your theme. By default, these images are not included as an option in your drop down.

WP Image Size Selection

Allows you to add any available image sizes to the media size selection drop down.

Delete Original Image vs WP Image Size Selection