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Markdown to HTML Converter

Type Markdown on the left and see the rendered HTML or live preview on the right. Powered by marked, supporting CommonMark plus GitHub Flavored Markdown extensions.

Markdown
HTML
<h1>Hello, Markdown!</h1>
<p>Markdown is a <strong>lightweight</strong> markup language with plain-text formatting syntax.</p>
<h2>Features</h2>
<ul>
<li>Headings, paragraphs, lists</li>
<li>Links: <a href="https://example.com">example</a></li>
<li>Inline code: <code>const x = 1</code></li>
<li>Code blocks:</li>
</ul>
<pre><code class="language-js">function greet(name) {
  return `Hello, ${name}!`
}
</code></pre>
<blockquote>
<p>Blockquotes work too.</p>
</blockquote>
<table>
<thead>
<tr>
<th>Column 1</th>
<th>Column 2</th>
</tr>
</thead>
<tbody><tr>
<td>Cell A</td>
<td>Cell B</td>
</tr>
</tbody></table>

What is Markdown?

Markdown is a lightweight plain-text formatting syntax invented by John Gruber in 2004. It lets you write structured documents (headings, lists, links, code, tables) using punctuation that reads naturally — # for a heading, ** for bold, > for a quote — instead of HTML angle-brackets. It is the de-facto format for README files, static-site posts, technical documentation and tools like Notion or Slack.

CommonMark is the standardised dialect of Markdown that most modern parsers implement; GitHub Flavored Markdown (GFM) extends it with tables, task lists, fenced code blocks with language hints, strikethrough and autolinks. This converter supports both.

How to use this tool

  1. Type or paste Markdown into the left input area. Click 'Load sample' to try with example content.
  2. Switch the right pane between HTML (the raw output) and Preview (the rendered result).
  3. Use 'Copy HTML' to put the output on your clipboard, or 'Download .html' to save a standalone file.

Frequently asked questions

Which Markdown flavour is supported?

CommonMark plus the most useful GFM extensions: tables, fenced code blocks (with language), strikethrough, autolinks. Definition lists, footnotes and HTML inside Markdown are not enabled by default.

Is the input sent to a server?

No. Conversion happens entirely in your browser — your Markdown source never leaves your machine.

Can I include raw HTML in the Markdown?

Inline HTML is preserved as-is. Be careful when copying the output back into a context where script tags or unsafe attributes could matter — sanitise it (with DOMPurify or a server-side sanitiser) before rendering untrusted output.

Are code blocks syntax-highlighted?

The output ships clean ```language``` fenced blocks with the standard `<pre><code class="language-xxx">` markup. We do not bundle a syntax highlighter so the HTML stays small and portable. Plug in highlight.js, Prism, or Shiki on the receiving side to colorise the blocks — they all read the language class out of the box.

How well does it handle large documents?

The conversion is fully client-side and runs in a single pass, so a typical book-length 50,000-word document still renders in well under a second on a modern laptop. The bottleneck is the browser layout pass when you paste extremely long output back into a contenteditable. For huge inputs, prefer downloading the HTML rather than letting the page re-render the preview live.

Common use cases

Tasks where converting Markdown to HTML in-browser saves real time.

Migrate a README to a CMS

Paste a project README and copy the HTML straight into a WordPress, Ghost, or Notion block — no need to install pandoc.

Compose an HTML email

Write the body in Markdown, convert, and drop the HTML into a transactional email template. Keep the source in plain text for easy edits.

Preview a PR before pushing

GitHub renders Markdown server-side; this gives you the same preview locally so a typo in a heading does not surprise the reviewer.

Convert documentation snippets

Pull a piece of internal docs written in Markdown and paste the HTML into a help center article, support reply, or wiki that does not speak Markdown.

Tips and shortcuts

Small adjustments that make the output more useful.

Tag your code blocks

Always specify the language after the opening backticks (e.g., ```ts). The output gets a language-xxx class that highlight.js or Prism can colour without further config.

Sanitise before rendering untrusted input

If the Markdown comes from a user, run the HTML through DOMPurify before rendering — Markdown allows raw HTML, including script tags.

Tables work; complex layouts don't

GFM tables convert cleanly. For multi-column layouts or anything design-heavy, drop into HTML directly inside the Markdown rather than fighting the syntax.

Keep alt text on images

![](url) renders, but the empty alt hurts SEO and accessibility. Take five seconds to write `![A short description](url)` — your future self will thank you.

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