Great plugin, thanks!
Maybe you should add a slider in admin panel for image quality
That will be good for website loading speed

https://www.ads-software.com/plugins/intermediate-image-sizes/

Hi! First of all, great idea on this plugin.

It reminds me of how Drupal manages different sizes. Drupal checks of the size exists, of not, then generates it.
Though I have one question. When a size is requested, does this plugin generate and store the image? Or does it regenerate the image every time?

Thanks, Jory

https://www.ads-software.com/plugins/intermediate-image-sizes/