Thomas Schulte

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.
For the tooltip effect a jQuery plugin called “qTip2” is used internally. 
Find more about this great project here: http://qtip2.com/ 
The thumbnails are provided by http://thumbsniper.com and its API.

ThumbSniper

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.

Daniele Perilli

Get the most relevant image, or the appropriate embedded media player, or the page screenshot of any external link in your post (similar to what you get when you share a page on Facebook or Google+).
The Super Link Preview plugin supports:
<ul>
<li>shortened links (for example t.co or bit.ly links)</li>
<li>media content (all formats natively supported by WordPress – https://codex.wordpress.org/Embeds)</li>
<li>OpenGraph images</li>
<li>page screenshots</li>
</ul>
If the external link points to a supported media, this plugin embeds the appropriate player in the page (through the WordPress native oEmbed function – https://codex.wordpress.org/Embeds). 
If no supported media is found, the plugin embeds the og:image specified in the page’s metadata. 
If the no og:image is found, the plugin parses the target external link to find the most relevant image, discarding images smaller than specified size and standard ad banner sizes. 
If not a relevant image is found, the plugin takes a screenshot of the linked page (through a WordPress public service located at http://s.wordpress.com/mshots/v1).
You can overrule the workflow and force the plugin to take the linked page’s screenshot with the forceshot dashcode attribute.
<h4>Shortcode Preview</h4>
[link-preview url=”link-to-website” forceshot=”false”]
<h4>Multisite Compatibility</h4>
The Super Link Preview plugin is compatibly with WordPress Multisite, just use the <a href="https://codex.wordpress.org/Create_A_Network#WordPress_Plugins" rel="nofollow ugc">Network Activate</a> feature to enable the shortcode on every site. If you only want to enable the shortcode for a specific site, activate the plugin for that site only.

Super Link Preview

Get the most relevant image, or the appropriate embedded media player, or the page screenshot of any external link in your post (similar to what you g …

ThumbSniper vs Super Link Preview