janrenz

With Usage of the wordpress.com inofficial webpage to screenshot function this plugins generates screenshots of websites. For more information check http://bdisco.de/wordpress-plugins/ 
There are a few options you can use in your shortcode [webscreenshot]:
url: full Url of the webpage which you want to have screenshoted (mandantory)
width: Pixel width of the screenshot (optional, default: 250)
refresh: If you want to reload the screenshot if it wasn’t generated on the first call (optional, default: true)
link: link image to given url (optional, default: true)
newpage: open link in new page (optional, default: true)
title: set link title tag (will be used as img alt tag also) (optional, default:”)
All img-tags generated will have a class called “webscreenshot”, the link will have a class called “webscreenshot-link” which you can you to perform additional style stuff
Feel free to make pull requests at https://github.com/jprberlin/web-screenshots

Web Screenshots

Displays Thumbnails of a given URL usings wordpress.com inofficial API. Use Shortcode [webscreenshot] with url and some  optional params.

Pdfcrowd Dev Team

The “Save as Image” plugin lets you add a full-featured screenshot button to your WordPress site in minutes, without custom code or server-side screenshot software. Visitors can save a page or post as an image with one click.
You can install and test the plugin right away in fully functional demo mode. No registration is needed. When you are ready, activate a paid PDFCrowd license for production use.
Useful links:
<ul>
<li><a href="https://pdfcrowd.com/save-as-image-wordpress-plugin/" rel="nofollow ugc">WordPress plugin guide</a>: setup, first test, and common workflows.</li>
<li><a href="https://pdfcrowd.com/faq/wordpress/" rel="nofollow ugc">WordPress FAQ</a>: common issues, examples, licensing, and troubleshooting.</li>
<li><a href="https://pdfcrowd.com/save-as-image-wordpress-plugin/ref/" rel="nofollow ugc">Option reference</a>: exact plugin settings.</li>
<li><a href="https://pdfcrowd.com/contact/" rel="nofollow ugc">Contact PDFCrowd support</a>: help with setup or output issues.</li>
</ul>
<h3>Features</h3>
<ul>
<li>Easy setup: Install from WordPress admin, activate the plugin, and test the button in demo mode.</li>
<li>One-click screenshot button: Let visitors save pages or posts as images.</li>
<li>Modern page rendering: Supports current HTML, CSS, images, and JavaScript.</li>
<li>Flexible button placement: Show the button automatically or place it manually where needed.</li>
<li>Customizable button appearance: Configure button text, icon, layout, and style.</li>
<li>Flexible output settings: Adjust screenshot width, image format, and other output options from WordPress admin.</li>
<li>Selected-content capture: Capture the full page or a selected part of the page.</li>
<li>No screenshot software to install on your server: Image generation runs through PDFCrowd.</li>
</ul>

Save as Image Plugin by PDFCrowd

Add a screenshot button to WordPress in minutes. Visitors can save pages or posts as images with one click.

Web Screenshots vs Save as Image Plugin by PDFCrowd