Not really a competition — Markdown compiles to HTML
Markdown was never meant to replace HTML; it's a readable shorthand that a parser converts into HTML for actual rendering. **bold** becomes <strong>bold</strong>; # Heading becomes <h1>Heading</h1>. The comparison isn't "which format is better" so much as "when is the shorthand worth using versus writing the target format directly."
# Title
This is **bold** and this is a [link](https://example.com).
<h1>Title</h1>
<p>This is <strong>bold</strong> and this is a <a href="https://example.com">link</a>.</p>
Why the shorthand exists at all
The HTML version is unambiguous and complete, but visually noisy for a human writing or reading the raw source — every piece of formatting requires an opening and closing tag, doubling the visual clutter around short pieces of text. Markdown's syntax was deliberately chosen to look like conventions people already used in plain-text email and documents (**bold**, > quote), so the unrendered source stays legible on its own, not just after compiling.
What HTML can do that Markdown structurally can't
Markdown deliberately covers a narrow, common set of formatting needs — headings, emphasis, links, lists, code, blockquotes, images. It has no native syntax for tables in the original spec (a later GFM extension — see GitHub Flavored Markdown), no way to set arbitrary attributes on an element, no support for complex nested layouts, forms, or interactive elements. Nearly every Markdown implementation handles this by allowing raw HTML to pass through untouched — meaning you can always drop into HTML directly for anything Markdown's shorthand doesn't cover, mixing both in the same document.
When to reach for each
| Need | Use |
|---|---|
| Prose, documentation, READMEs, blog posts | Markdown |
| Precise layout control, custom attributes, forms | HTML |
| Content edited directly by non-technical writers | Markdown (lower syntax burden) |
| Anything Markdown has no syntax for | Raw HTML, embedded in the Markdown file |
Common mistakes
- Assuming Markdown replaces HTML entirely. It compiles to HTML and deliberately covers only common cases — anything more specific still needs raw HTML, which most renderers pass through unchanged.
- Writing raw HTML for things Markdown already covers simply, adding unnecessary verbosity for no benefit over the equivalent shorthand.
- Forgetting that HTML passed through Markdown isn't always sanitized. If the Markdown source comes from untrusted user input, raw HTML passthrough is a real XSS consideration — see the Complete Guide to HTML Entities for why escaping matters in that context.
FAQ
Does every Markdown renderer compile to HTML?
The vast majority do, yes — though some tools convert Markdown to other output formats (PDF, plain text) as well; HTML is simply the most common target given Markdown's origins in web content.
Can I mix raw HTML directly into a Markdown file?
Yes, in most implementations — Markdown generally passes HTML through untouched, letting you use raw tags for anything the shorthand syntax doesn't cover.
Is Markdown a security risk if it allows raw HTML passthrough?
It can be, specifically if the Markdown source comes from untrusted user input — unsanitized HTML passthrough is a real XSS vector in that scenario, which is why user-generated Markdown often needs additional sanitization before rendering.
Learn Markdown's core syntax and its relationship to HTML in the Complete Guide to Markdown.