Anup Debnath

Put website thumbnails on your site. Use this shortcode
<pre>[pagepeeker size="t" url="google.com" alt="Google"]</pre>
Supported parameters
<ul>
<li>url – URL of the site to take snapshot</li>
<li>size – The size of the thumbnail. Available sizes:
<ul>
<li>t – Tiny, 90 x 68 pixels</li>
<li>s – Small, 120 x 90 pixels</li>
<li>m – Medium, 200 x 150 pixels</li>
<li>l – Large, 400 x 300 pixels</li>
<li>x – Extra large, 480 x 360 pixels</li>
</ul>
</li>
<li>alt – For image alt</li>
</ul>

Pagepeeker

Put website thumbnails on your site. Use this shortcode [pagepeeker size="t" url="google.com" alt="Google"]

semtix

Save history of your pages as screenshots. After every post change, this plugin will generate screenshot and save it to your media gallery. 
For creating professional screenshots, this plugin rely on external thumbnail generating service by <a href="https://semtix.cz/" rel="nofollow ugc">Semtix.cz</a>, because for 
native-looking screenshots is not possible to create using pure PHP/HTML/Javascript. We are using headless Chrome in combination with Selenium framework to generate 
screenshots of any size. Note that the only data that are passed from your website is URL of edited webpage, where we return back generated screenshot. Nothing more.
<a href="https://semtix.cz/osobni-udaje/" rel="nofollow ugc">Privacy policy (available in Czech language)</a>
Who is this good for?
<ul>
<li>For web developers as a proof of number of changes demanded by client (can be as a part of proof)</li>
<li>Legal stuff – to have a proof that page contain content on given date</li>
<li>Anyony who want to track development of their website</li>
</ul>

WordPress History in Screenshots by Semtix.cz

Save history of your pages as screenshots. After every post change, this plugin will generate screenshot and save it to your media gallery.

Pagepeeker vs WordPress History in Screenshots by Semtix.cz