Markdown to HTML: Best Free Tools and How They Work

Markdown is the writing format of choice for developers. README files, documentation, blog posts, technical wikis — nearly all developer-facing content starts in Markdown. At some point, that Markdown needs to become HTML. This guide explains how Markdown-to-HTML conversion works, covers the best free tools for different use cases, and shows how to do the conversion programmatically when you need it in a pipeline or application. How Markdown to HTML Conversion Works Markdown is a lightweight markup language with a plain-text syntax designed to be converted to HTML. John Gruber created it in 2004, and the core spec maps a set of text conventions to HTML elements: Markdown HTML # Heading <h1>Heading</h1> ## Subheading <h2>Subheading</h2> **bold** <strong>bold</strong> *italic* <em>italic</em> [link](url) <a href="url">link</a>  <img alt="alt" src="src"> `code` <code>code</code> > quote <blockquote>quote</blockquote> --- <hr> A Markdown parser processes the input text and appli