How to Convert Markdown to HTML Online — Free, Instant Preview

What Markdown gets you

Markdown is the quickest way to produce structured content without touching HTML tags. You write **bold** instead of <strong>bold</strong>, # Heading instead of <h1>Heading</h1>, and lists just look like lists. The Markdown to HTML converter handles the translation in real time.

Which Markdown flavor?

The converter defaults to GitHub Flavored Markdown (GFM), which is the de facto standard. GFM extends classic Markdown with tables, fenced code blocks with syntax highlighting, task lists, strikethrough, and auto-linked URLs. If you're writing for anywhere else (Stack Overflow, Reddit, Discord, Notion), GFM is close enough.

Common use cases

• Blog post drafts — write in Markdown, paste HTML into your CMS
• Email templates — write the message in Markdown, export HTML for Mailchimp/SendGrid
• Documentation — quickly see what your README will look like before pushing
• Slack/Discord → forum post — convert Markdown from one platform to another's HTML
• Learning HTML — seeing Markdown and HTML side-by-side is a fast way to internalize tag semantics

What's preserved, what's sanitized

Markdown allows raw HTML inline. The converter includes a sanitizer by default — script tags, event handlers, and javascript: URIs are stripped. If you need raw passthrough (for trusted content), toggle the sanitizer off. Never paste user-submitted Markdown directly into a site without sanitizing.

Converting HTML back to Markdown

The reverse direction is also common — you have an HTML article and want Markdown for a wiki or docs repo. Use HTML to Markdown. The round trip (Markdown → HTML → Markdown) is usually clean for simple content but can lose nested formatting details.

Previewing the rendered HTML

The converter shows rendered output alongside raw HTML. For more complex HTML debugging — iframe sandboxing, CSS interaction, JavaScript — use HTML preview. Before deploying HTML, run it through HTML minifier for production.

Markdown at scale

If you're processing many files programmatically, the browser-based converter is for quick one-offs. For CI pipelines or static site generation, use a CLI tool (Pandoc, cmark, remark). Same output, scriptable.