Kaspars

Uses a customized version of the <a href="https://github.com/kasparsd/code-prettify-lib/pull/1" rel="nofollow ugc">Code Prettify library</a> to support local styles and scripts. Plugin applies code highlighting automatically to all <code><pre></code> tags on the page.
Compatible with Gutenberg and doesn’t lock you in with specific markup requirements.
<h4>Development</h4>
Plugin development <a href="https://github.com/kasparsd/code-prettify" rel="nofollow ugc">on GitHub</a>.
<h4>Credits</h4>
Created and maintained by <a href="https://kaspars.net" rel="nofollow ugc">Kaspars Dambis</a>. All of my open source work is available <a href="https://github.com/kasparsd" rel="nofollow ugc">on GitHub</a>.
Use Contact Form 7? <a href="http://preseto.com/go/cf7-storage" rel="nofollow ugc">Storage for Contact Form 7</a> is my commercial plugin (GPL license) for storing all form submissions in your WordPress database.
Cover photo by <a href="https://www.flickr.com/photos/110751683@N02/13334080323/" rel="nofollow ugc">Yuri Samoilov</a>

Code Prettify

I tried to use this plugin in WP 5.0.2 and it works. I got an issue with Litespeed cache configuration and seems we should exclude this plugin javascript from an optimization process. Then you will be fine!

It works as expected!

Perfect. Automatic.

Finally a plugin that works with the outdated "Crayon Syntax Highlighter" plugin

So I don't have to mess around with every post.

Good replacement

Your plugin makes me very secure and happy to use because it doesn't make me dependent, I can disable it without affecting the articles. Good job.

I just hope you can keep the plugin up to date to be compatible with new versions of WordPress.

Thank you!

Please keep update to compatible with WordPress version

100% automatic code highlighting using the Prettify library. No shortcodes, no classnames, fully automatic and pure awesome.

Dan D

Codeblocks Extended with PrismJS was born of a personal need for a lightweight code highlighter, with special functionality. 
Many of the other PrismJS based plugins in the repository were either outdated, or were lacking features that I was looking for.
Features:
<ul>
<li>Integrates the latest PrismJS build, with the most common langauges used.</li>
<li>Integrates the PrismJS line-numbers plugin, to automatically number lines of code.</li>
<li>Integrates the PrismJS line-highlight plugin to allow you to highlight specific lines of code.</li>
<li>Integrates ClipboardJS + custom jQuery to add a “Copy to Clipboard” button to each code block.</li>
<li>Custom Text Editor button to wrap selected text with the most commmon <code><pre></code> and <code><code></code> classes, and replacing special characters with their HTML safe equivalents.</li>
<li>Custom Visual Editor / TinyMCE dropdown button, with the most common languages to wrap selected text.</li>
<li>Since this works via wrapping <code><pre></code> and <code><code></code> tags with classes, you can use all custom class settings that PrismJS offers.</li>
<li>No shortcodes to mess with, so you don’t have to worry about losing whitespace between editor modes.</li>
<li>No settings page needed: Just activate it and go!</li>
</ul>
For a full list of languages supported and more information on this plugin’s use, please check out the FAQ.
Note: This does NOT auto-detect the language. Most plugins that do so brute force the languages or require file extensions, resulting in a much heavier plugin. The decision was made to keep this as light-weight as possible.
Note 2: This is designed to work with the Classic Editor. It does not currently work in Gutenberg blocks.
Thanks to Mike @ <a href="https://wp-bullet.com/" rel="nofollow ugc">WP Bullet</a> for the banner and icon.

Codeblocks Extended with PrismJS

Codebocks Extended with PrismJS includes syntax highlighting, copy to clipboard, and Visual + Text editor integration.

Code Prettify vs Codeblocks Extended with PrismJS