neoslab

Powered Minifier allow you to reduce your page load and increase your performance by minifying your HTML source along with all the CSS and JS code present in your markup.
<h3>License</h3>
Good news, this plugin is free for everyone! Since it’s released under the GPL, you can use it free of charge on your personal or commercial site.

Powered Minifier

Honestly it's the best minifier plugin for Wordpress 

Simply Excellent

Reduce your page load by minifying your HTML source along with all the CSS and JS code present in your markup.

peterpfeiffer

This plugin requires PHP 7+, so if you are using an old PHP version it will not work
Minify and Optimize your Javascript by clicking one button. All you have to do is go to Settings and click Javascript Minify. Activating the plugin there will minify and optimize your Javascript. No settings required, just click one button.
So anything you can do to speed up the load time of your site should be worth investigating, right? One such thing is “minifying” the Javascript files that are used in part to build your site. As is typically the case, there is a plugin available that can do the job for you – Suprise: It’s this one! Code from this plugin is forked from aph merge scripts a really great plugin. You can find it by searching for it here on wordpress.org in the plugin search. Also full copyright to JShrink and YUIcompressor, which is used in this plugin.
If you want to have a chat or need support please contact me here:
peterpfeiffers88@gmail.com
<ol>
<li>Upload the zip file and unzip it in the /wp-content/plugins/ directory.</li>
<li>Activate the plugin through the Plugins menu in WordPress</li>
<li>Go to Settings and then click Javascript Minify and enable the options you want.</li>
</ol>

Minify Javascript

Minify and Optimize your Javascript by clicking one button and place it in the footer or header.

Powered Minifier vs Minify Javascript