Ozan Canakli

This plugin allows you to add custom site-wide CSS, JavaScript, Header, Footer Code to your WordPress site. The changes appear instantly on your website with help of WordPress Live Customizer.
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In your WordPress Dashboard, navigate to Customize > Live Code Editor to get started.
When you Change or Update your WordPress Theme, Your Custom Code isn’t effected from these changes.
NEW FEATURES as Version 1.0.5: 
* Add Custom CSS to WordPress Admin dashboard. 
* Add Custom JavaScript to WordPress Admin dashboard.
MAIN FEATURES:
<ul>
<li>Custom CSS code</li>
<li>Custom Javascript code</li>
<li>Custom Header Code (Inside tags)(Google Analytics and Facebook Pixel compatible.)</li>
<li>Custom Footer Code (Before closing tag aka wp_footer function)</li>
<li>See Your Changes Immediately on your WordPress Site</li>
<li>Built in Syntax Code Highlighter</li>
<li>16 Color Schemes (Monokai, Chrome, GitHub, Twilight, Dreamweaver, XCode, Eclipse etc. 8 Light, 8 Dark)</li>
<li>Live Syntax Checking (CSS, JavaScript, HTML)</li>
<li>Syntax Highlighting</li>
<li>Line wrapping</li>
<li>Code folding</li>
<li>Multiple cursors and selections</li>
<li>Handles huge code blocks (four million lines seems to be the limit!)</li>
</ul>
Special thanks to <a href="https://profiles.wordpress.org/justinbusa/" rel="nofollow ugc">Justin Busa</a> of <a href="https://wordpress.org/plugins/beaver-builder-lite-version/" rel="ugc">Beaver Builder</a> for the inspiration.

Live Custom CSS JS Code Editor

Live Custom CSS JS Code Editor allows you to easily add custom CSS, JavaScript, Header, Footer Code to your site, straight from your WordPress Customi …

Devpri

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Devpri Custom Code

A simple plugin to display HTML/CSS/JS custom code.

Live Custom CSS JS Code Editor vs Devpri Custom Code