Katsushi Kawamori

<h4>Thumbnails</h4>
<ul>
<li>thumbnail</li>
<li>medium</li>
<li>large</li>
<li>1536×1536</li>
<li>2048×2048</li>
<li>Generated with theme</li>
<li>Generated with plugin</li>
</ul>
<h4>Functions</h4>
<ul>
<li>Large image threshold</li>
<li>Exif automatic rotation</li>
</ul>


Disable Generate Thumbnails

Works nicely and do what it promises. Nice plugin.

Excellent

Select the thumbnails and functions to disable it.

Makeworthy Media

<p>Disables WordPress from generating image thumbnails when you upload a PDF. This behavior was introduced in WordPress 4.7, so this plugin isn’t needed for any version older than that. Not all web hosts support the ability to generate images from PDFs either, so even if you have 4.7 or newer you might not need this.</p>


Disable PDF Thumbnails

Disables WordPress from generating image thumbnails when you upload a PDF.

Disable Generate Thumbnails vs Disable PDF Thumbnails