florianluce

With Shortener URL Redirect, You don’t have to do anything! 
When you publish a new post, page or custom post type, a short url is generated. You can share it, and it will redirect the user to the long url page. It’s invisible to him! 
This plugin does not use any external service.
example: 
https://your-site.com/ab2CdF redirect to https://your-site.com/my-categorie/my-post-name
optimisation available:
<ul>
<li>Create a short URL for each new publication (post, custom post types, page)</li>
<li>Redirect short URL to long/default URL</li>
<li>Display the short link to copy on admin publication</li>
</ul>
Notes: 
This plugin is actually not tested with: 
* Multisite network 
* Translate plugins 
* Other plugins

Shortener URL Redirect

Generate short url for all posts, custom post types and pages to redirect your user to the long URL. No more long URLs share!

Egoitz Gonzalez

Polr is a quick, modern, and open-source link shortener. This plugin allows you to use Polr service in WordPress. 
Polr software is a good way to shorten the long urls. Now you can use it very fast inside your WordPress for your posts.
<h4>Plugin Features</h4>
<ul>
<li>Shorten url of posts.</li>
<li>Github: <a href="https://github.com/aldakur/wp-polr" rel="nofollow ugc">Polr WordPress Plugin</a></li>
</ul>

Polr WordPress Plugin

Polr is a quick, modern, and open-source link shortener. This plugin allows you to use Polr service in Wordpress.

Shortener URL Redirect vs Polr WordPress Plugin