How to Convert Markdown to HTML

Markdown is the de facto writing format for developers, technical writers, and content creators, but browsers render HTML. When you need to publish Markdown content on the web, embed it in an email, or drop it into a CMS that expects HTML, the Markdown to HTML converter handles the translation so you don’t have to write tags by hand.

Understanding Markdown flavors

Not all Markdown is created equal. The original Markdown spec by John Gruber left many edge cases undefined, which led to competing implementations that handle ambiguous syntax differently. CommonMark was created to standardize these edge cases with a rigorous specification, and it is what most modern parsers are built on.

GitHub Flavored Markdown (GFM) extends CommonMark with features commonly needed in software projects: tables with pipe syntax, task lists with - [ ] checkboxes, strikethrough with ~~tildes~~, and automatic URL linking. If you are writing README files, pull request descriptions, or documentation hosted on GitHub, you are writing GFM whether you realize it or not.

The rendering differences between flavors can catch you off guard. A table that renders perfectly on GitHub might not parse at all in a strict CommonMark processor. Nested lists may indent at two spaces in one parser and require four in another. When converting Markdown to HTML, knowing which flavor your source was written in helps you choose the right parser and avoid broken output.

Tips and best practices

• Stick to CommonMark basics for maximum portability. Headings, paragraphs, links, images, code blocks, and standard lists work identically across virtually every parser.
• Use fenced code blocks with language hints. Triple-backtick blocks with a language identifier (e.g., ```js) produce <code> elements with class names that syntax highlighters can pick up on the HTML side.
• Escape special characters when needed. Characters like <, >, and & have meaning in both Markdown and HTML. If your converted output looks wrong, check whether these characters need escaping in your source.
• Preview before publishing. Markdown can look fine in a text editor but produce unexpected HTML when headings are missing blank lines above them or lists aren’t indented consistently.

Common issues

• Tables not rendering. Standard CommonMark does not support tables. If your converter is set to strict CommonMark mode, pipe tables will appear as plain text. Switch to GFM-compatible parsing or use an extension that enables table support.
• Inline HTML getting stripped. Some Markdown-to-HTML converters sanitize raw HTML tags for security. If you intentionally embedded <div> or <details> tags in your Markdown and they vanish in the output, check whether the converter has a “safe mode” or HTML-filtering option you need to disable.
• Line breaks behaving unexpectedly. In standard Markdown, a single newline does not create a <br>. You need two trailing spaces or a blank line. If your paragraphs are running together, this is almost always the cause.