Kristopher Lagraff

This plugin enables the short link menu item to display in the admin toolbar. This feature was removed from 
version 3.3 by default.

Reenable Shortlink Item In Admin Toolbar

This plugin will display the shortlink menu item in the admin toolbar.

Sasan Salamzadeh

<a href="http://salamzadeh.net/plugins/urlyar/" title="URLYar URL Shortener" rel="nofollow ugc">URLYar URL Shortener</a> allows you to generate shortlinks for post/pages using URLYar URL Shorteners, with a few additional features.
Features: 
* Language file as 100% translation now available at wordpress.org 
* Localization – Persian translation added (100% complete) 
* QR Code Support (using Google Chart API Or URLYar QR API) 
* Nice ID links with QR Code (i.e. http://your_site/123.qr) 
* Automatic generation of a Short URL/Shortlinks 
* Cached Shortlink – thus generated only once. 
* Choose to generate shortlinks using permalinks or the posts ID (e.g. http://your_site/index.php?p=123). 
* Relatively extensive shortlink support 
* Action Hooks available for other plugins to utilize generated shortlinks (From Ver 3.0 Onwards) 
* Nice ID links – http://your_site/123 instead of http://your_site/index.php?p=123 
* Shortcode support: Place [urlyar_shortlink] in your article where you want to display the shortened url. 
* Append a link to short URL below your post content 
* Append a link to short URL below your page content 
* Append a link to short URL below your woocommerce product content
Available Template Tags
On-demand shortening function:
<pre><code><?php urlyar_shorturl('http://www.wpnegar.com', 'urlyar'); ?>
</code></pre>
To show the generated links::
<pre><code><?php urlyar_show_shorturl($post); ?>
</code></pre>
Or if WordPress 3.0:
<pre><code><?php the_shortlink(); ?>
</code></pre>
https://codex.wordpress.org/Function_Reference/the_shortlink
Available hooks and filters
<ul>
<li>urlyar_use_shortlink (Action Hook)</li>
<li>urlyar_filter_shortlink (Filter)</li>
</ul>
Future Versions and on:
<ul>
<li>More services/features can be added upon request (https://salamzadeh.net/plugins/urlyar)</li>
</ul>
Support via:
<ul>
<li>https://wordpress.org/tags/url-shortener</li>
<li>Contact me via my website ( https://salamzadeh.net/contact/ )</li>
</ul>

URLYar URL Shortner

This plugin allows you to generate shortlinks for post/pages using URLYar URL Shorteners

Reenable Shortlink Item In Admin Toolbar vs URLYar URL Shortner