FizTool

Fiz Auto Media helps site owners manage common media and publishing tasks from one plugin.
Developed By FizTool. 
Plugin website: https://fiztool.com/
Main features include:
<ul>
<li>Image compression and WebP generation for supported media files.</li>
<li>Bulk compression workflow for existing Media Library images.</li>
<li>Automatic image alt text and description helpers.</li>
<li>Featured image tools for posts without thumbnails.</li>
<li>Duplicate post detection tools.</li>
<li>Auto post scheduling tools using WordPress cron.</li>
<li>Media cleaner tools for scanning and reviewing unused media before cleanup.</li>
</ul>
Fiz Auto Media runs locally inside WordPress and does not require an external account for its included features. If the Featured Image helper is enabled, WordPress may request external image URLs found in post content so those images can be imported into the Media Library after the required upload and edit permissions are confirmed.
The plugin uses WordPress capabilities, nonces, sanitization, escaping, and WordPress filesystem helpers where appropriate.

Fiz Auto Media

Compress images, bulk schedule posts, review duplicate posts, scan unused media, and improve image metadata from one dashboard.

Gagan Deep Singh

Sometimes you may want the images on your blog/site to be pixel perfect, while sometimes you may want them to be compressed to save space on the server.
This plugin allows you to select the quality of the thumbnail images generated by WordPress, as easy as that. Just go to Media Settings page and modify the Image Quality setting.
Plugin only works for new uploads, but in case you want to modify the thumbnails generated earlier, you can either use
<a href="https://wordpress.org/plugins/regenerate-thumbnails/" rel="ugc">Regenerate Thumbnails</a>
or if you are familiar with WP-CLI, then you can use this command to regenerate
<pre><code>wp media regenerate
</code></pre>
P.S. It does not change the quality of the original image that you upload, 
but only changes the quality of the thumbnails WordPress generates from that image.

Image Quality

Lets you adjust the quality of image thumbnails that WordPress generates.

Fiz Auto Media vs Image Quality