Amit Gupta

iG:Syntax Hiliter allows you to post source code to your site with syntax highlighting and formatting (as seen in code editors, IDEs). You can paste the code as is from your code editor or IDE and this plugin will take care of all the code colouring and preserve your formatting. It uses the <a href="http://qbnz.com/highlighter/" rel="nofollow ugc">GeSHi library</a> to colourize your code and supports over a 100 programming languages. Most common languages are included with the plugin and it includes drop in support for more languages used by GeSHi.
NOTE : For fast results and less load on your server, you should have a cache plugin installed. That way the plugin won’t have to parse the code blocks on a post every time its loaded in browser.
<h4>Minimum Requirements</h4>
<ul>
<li>WordPress 4.1 or above</li>
<li>PHP 7.4.0 or above</li>
</ul>
Pull requests are welcome on Github.
Github: <a href="https://github.com/coolamit/ig-syntax-hiliter/" rel="nofollow ugc">https://github.com/coolamit/ig-syntax-hiliter/</a> 
<a href="https://github.com/coolamit/ig-syntax-hiliter/blob/master/README.md" rel="nofollow ugc">Documentation on plugin usage and configuration</a>

iG:Syntax Hiliter

A plugin to easily present source code on your site with syntax highlighting and formatting  (as seen in code editors, IDEs).

PiotrPress

Clearcode

The CC-Syntax-Highlight plugin supports syntax highlighting of Posts, Pages, and any public Custom Post Types. 
It uses <a href="https://highlightjs.org/" rel="nofollow ugc">highlight.js</a> or <a href="https://github.com/google/code-prettify" rel="nofollow ugc">google-code-prettify</a> libraries. 
Additionally it can use the <a href="https://clipboardjs.com/" rel="nofollow ugc">clipboard.js</a> library to add a button that copies text to the clipboard and <a href="https://github.com/wcoder/highlightjs-line-numbers.js/" rel="nofollow ugc">highlightjs-line-numbers.js</a> plugin to add line numbers. 
It is delivered with support for shortcode (default [code] – you can change it on the settings page) which automatically converts all special characters to HTML entities. 
This plugin is compatible with Multisite WordPress installations.
<h4>How does it work?</h4>
<ol>
<li>Go to the ‘Settings > Syntax Highlight’ page, select your preferred options and save them.</li>
<li>Simply add the source code to your post (or other selected public Custom Post Type) wrapped with: 
<pre><code>Your source code</code></pre> 
or if you would like to automatically convert all special characters to HTML entities, use shortcode wrapper instead (default [code] – you can change it on the settings page): 
<pre>[code]Your source code[/code]</pre></li>
</ol>
Plugin’s js scripts and css styles files only load if the source code occurs on displaying page.

CC-Syntax-Highlight

This plugin allows you very simply syntax highlight source code in your content using highlight.js or google-code-prettify libraries.

iG:Syntax Hiliter vs CC-Syntax-Highlight