eaxjp

Image will be shrink in the case of automatic JPEG and PNG format to upload the image. 
There are the following features in isShrinker WordPress Plugin.
Can specify the maximum file size. 
Keep aspect ratio. 
Convert image inclination from inclination information of image
If you upload, such as iPhone app slope of image because reduced after correction 
it appears in the blog exactly as it appears in the iPhone.
The maximum file size of the image is 50KB by default 
Length of the long side of the image is 640px by default 
And it is with, but you can change from the management screen of WordPress.
Upload png image ‘watermark.png’ to plugin directory and then watermark will be enable. 
Watermark add on right bottom of image. 
If watermark enabled water mark transparency setting is enable.
<h3>Arbitrary section 1</h3>

isShrinker

When uploading, it will shrink the image automatically. The feature is  keeping the aspect ratio and  maximum file size can be specified.

Nicolas Juen

Jason Rouet

The Mediapapa Team

This plugin lets you create custom image sizes for your site. Override your theme sizes directly on the Media settings page, regenerate thumbnails, and copy <code>add_image_size</code> PHP for your theme.
<h3>ℹ️ Simple Image Sizes, a Mediapapa product</h3>
Simple Image Sizes will always remain free. It is actively maintained by me (Nicolas Juen). I’m also building <a href="https://wordpress.org/plugins/mediapapa/" rel="ugc">Mediapapa</a>, a complementary plugin focused on understanding and organizing your media library. <a href="https://www.wp-mediapapa.com/blog/simple-image-sizes-update/" rel="nofollow ugc">> More on these changes</a>
<h3>Features</h3>
<ul>
<li>Insert images in posts at the right size using your custom sizes.</li>
<li>Control whether each size appears in the “Insert media” size dropdown.</li>
<li>Regenerate thumbnails in bulk from Settings → Media, and pick which sizes to rebuild.</li>
<li>Copy generated <code>add_image_size</code> PHP for your theme when you want to keep sizes and deactivate the plugin.</li>
<li>Regenerate from the Media library: one file at a time or with list bulk actions.</li>
<li>Regenerate from a single attachment’s edit screen.</li>
<li>Approximate end time and clearer feedback while bulk regeneration runs.</li>
</ul>
<a href="https://github.com/Rahe/Simple-image-sizes" rel="nofollow ugc">Contribute on GitHub directly.</a>

Simple Image Sizes

This plugin lets you create custom image sizes for your site. Override your theme sizes directly on the Media settings page, regenerate thumbnails, an …

isShrinker vs Simple Image Sizes