Toao.net

Sometimes, it’s not necessary to keep copies of full resolution images on your web server. But, when you solicit images from many sources, you may not be able to rely on users to size images to your specifications. Here’s a very simple plugin that removes the full resolution image and replaces it with an image resized to your preference.
The plugin makes no changes to your database and is written with just 17 lines of code.

Maximum Image Size

When extremely large images are uploaded to the Media Library, replace it with the Large size image, configured in Settings >> Media.

OriginalEXE

If you were ever annoyed about the way WordPress handles images resizing, this is a plugin for you.
What this plugin does is it optimizes the image handling in such a way that images are resized only when they are actually needed. What that means is that if your plugins/theme define a lot of image sizes, none of them will be generated on the image upload (like they would be usually), but only if they are actually requested in that size.
Resizing is done only once, images are later normally served by WordPress, so there is no performance hit.
Plugin also includes a method for removing all of the previously generated image sizes (useful when you install this plugin on a site with a lot of existing media).
TO REMOVE image sizes generated prior to activating the plugin, visit the ‘Tools -> Remove image sizes’ and use the button to perform the cleanup.
Other than that, you don’t need to do anything, plugin works silently in the background.
To sum up:
<ul>
<li>Resize images only when needed</li>
<li>Clean up existing images sizes</li>
<li>No performance hit</li>
<li>Free up your hosting space</li>
</ul>

Optimize Images Resizing

Hello! nice plugin one click option and all done!
add a custom search for images to detele.
ex. -unsmushed.jpg

God Job! Need More Features!

Plugin optimizes the process of generating custom image sizes in WordPress and offers a cleanup functionality for preexisting images.

Maximum Image Size vs Optimize Images Resizing