Floris-Jan

Simple Markdown is a lightweight WordPress plugin that adds a custom Gutenberg block for rendering Markdown content directly in your posts and pages. Perfect for developers, writers, and anyone who prefers writing in Markdown format.
NEW in 1.3.0: Professional Code Beautification 
* Automatic code formatting and indentation for all supported languages 
* Professional copy buttons positioned as elegant tabs outside code blocks 
* Language-aware beautification (JavaScript, PHP, CSS, JSON, Bash) 
* Smart preservation of ASCII art and tree structures in copy-only blocks
Core Features:
<ul>
<li>Custom Gutenberg block for Markdown content</li>
<li>Support for common Markdown syntax:
<ul>
<li>Headers (H1-H6)</li>
<li>Bold and italic text</li>
<li>Inline code and code blocks with copy functionality</li>
<li>Links</li>
<li>Unordered and ordered lists</li>
<li>Blockquotes</li>
</ul>
</li>
<li>Professional code block rendering with:
<ul>
<li>Automatic beautification and proper indentation</li>
<li>One-click copy functionality with visual feedback</li>
<li>Language labels (JavaScript, PHP, CSS, JSON, Bash)</li>
<li>Tight line spacing optimized for code readability</li>
</ul>
</li>
<li>Clean HTML output with semantic markup</li>
<li>Theme-resistant styling with robust CSS overrides</li>
<li>Easy to use interface</li>
</ul>
This is the core version with all essential markdown features plus professional code handling. A Pro version with syntax highlighting and other advanced features will be available in the future.
Supported Markdown Syntax:
<ul>
<li><code># Header 1</code> through <code>###### Header 6</code></li>
<li><code>**bold text**</code> and <code>*italic text*</code></li>
<li><code>`inline code`</code> and code blocks with triple backticks</li>
<li><code>[link text](URL)</code> for links</li>
<li><code>- item</code> for unordered lists</li>
<li><code>1. item</code> for ordered lists</li>
<li><code>> quote</code> for blockquotes</li>
</ul>
Advanced Code Block Syntax:
<ul>
<li><code>```javascript copy</code> – Beautified JavaScript with copy button</li>
<li><code>```php copy</code> – Beautified PHP with copy button</li>
<li><code>```css copy</code> – Beautified CSS with copy button</li>
<li><code>```json copy</code> – Beautified JSON with copy button</li>
<li><code>```bash copy</code> – Bash commands with copy button</li>
<li><code>```copy</code> – Copy button without beautification (preserves ASCII art)</li>
<li><code>```</code> – Plain code block (no beautification, no copy button)</li>
</ul>

Simple Markdown

Simple and fast plugin to render markdown with a custom Gutenberg block. Professional code beautification and copy functionality included.

crimson090

Adds buttons to the Text (HTML) edit which generate Markdown syntax. These buttons serve as a great introduction to 
users who are new to Markdown, as well as shortcuts for more experienced users. The buttons include:
<ul>
<li>Bold</li>
<li>Italic</li>
<li>Blockquote</li>
<li>Link</li>
<li>Code</li>
<li>Table</li>
<li>Headers</li>
<li>Help (links to external Github Markdown guide)</li>
</ul>
This plugin does not modify the Visual editor, as that editor is not ideal for writing Markdown in. It’s recommended you disable 
the Visual editor entirely to enforce using Markdown.
Note that this plugin does not render Markdown. You should use a plugin (such as Jetpack Markdown) to render markdown in your theme.

MarkdownBar

Adds a toolbar of buttons to the Text (HTML) edit which generate Markdown syntax

Simple Markdown vs MarkdownBar