zohebtg

Simple Code Block Highlighter enhances the default WordPress code and preformatted blocks. It can show line numbers, add a copy-to-clipboard button, switch between light and dark display themes, and automatically color code blocks with bundled Highlight.js syntax highlighting.
The plugin uses the WordPress Settings API, validates and sanitizes saved options, escapes admin output, and avoids inline JavaScript-generated HTML for line numbers. Syntax highlighting is served from the plugin files and does not load a third-party CDN on visitor pages.
For setup help, read the <a href="https://www.techgrapple.com/simple-code-block-highlighter-free-plugin-for-wordpress/" rel="nofollow ugc">Simple Code Block Highlighter guide</a>.
<h3>Third-party Libraries</h3>
This plugin bundles Highlight.js 11.11.1 for syntax highlighting.
Highlight.js 
Source: <a href="https://github.com/highlightjs/highlight.js" rel="nofollow ugc">Highlight.js on GitHub</a> 
License: BSD 3-Clause 
License file included at: assets/vendor/highlightjs/LICENSE

Simple Code Block Highlighter

Enhances WordPress code blocks with line numbers, copy functionality, automatic syntax highlighting, and light or dark themes.

kontur.us

This Plugin will add your own ‘kontur Copy Code Button’ to any code-block on your site. When clicked, the code is copied to the clipboard. Works as well on mobile devices and the standard Gutenberg WP-Code-Block.
<h3>Set your own</h3>
<ul>
<li>button-text(s),</li>
<li>button-icon or image from the library,</li>
<li>class(es),</li>
<li>button-color, </li>
<li>button-text-color </li>
<li>the code text colorand “pre”-Background.</li>
<li>NOW: ALL color setting changes in a “live view” for easier styling.</li>
</ul>
<blockquote>
Want more 
 Please get involved and send uns your ideas. Via email or on the WordPress support page 🙂
</blockquote>
<a href="https://wordpress.org/support/article/managing-plugins/#installing-plugins" rel="ugc">More info on installing WP plugins</a>
Uninstalling
This plugin cleans up after itself. All plugin settings will be removed from your database when the plugin is uninstalled via the Plugins screen.

kontur Copy Code Button

Add your own 'kontur Copy Code Button' with your own icon, text, class, color and 'pre' background. Works as well with the Gutenbe …

Simple Code Block Highlighter vs kontur Copy Code Button