Convert Markdown to HTML Online

Mardna converts Markdown to a single HTML file that carries its own styling. Not a naked fragment that needs a stylesheet to be legible — a finished page you can open by double-clicking it, email as an attachment, or drop onto any host.

Open the Markdown editor

How to export Markdown as HTML

Paste or open your Markdown
Type it, paste it, or drop a .md file onto the window.
Choose a theme
The theme, font and light or dark setting are what the exported file will use.
Export as HTML
Open the export menu with ⌘⇧E and choose HTML. The file downloads immediately, named after the document's first heading.

One file, everything inside it

The exported document is genuinely self-contained. Every stylesheet the page is using is inlined, the web fonts it actually uses are embedded as data URIs, syntax highlighting is baked into the markup as coloured spans, and diagrams travel as inline SVG.

So the file makes no network requests at all. It renders identically on a machine with no internet connection, no fonts installed and no access to your site — which is what makes it a good format for an attachment, an archive, a build artefact, or a page you hand to someone who will open it once.

What the exported markup looks like

The structure is plain and semantic — the interactive parts of the app (copy buttons, anchor affordances, expand controls) are stripped on the way out, leaving the document itself:

<!doctype html>
<html lang="en" data-theme="github">
  <head>
    <meta charset="utf-8">
    <title>Release notes</title>
    <style>/* theme, highlighting and fonts, inlined */</style>
  </head>
  <body>
    <main class="md-surface">
      <article class="md-body">
        <h1 id="release-notes">Release notes</h1>
        <p>…</p>
      </article>
    </main>
  </body>
</html>

Headings keep GitHub-compatible identifiers, so in-page anchors continue to work; image alternative text, table headers and list semantics are all preserved, which matters both for screen readers and for anything that later reads the file programmatically.

HTML or PDF — which to export

Export HTML when the document should stay live: it reflows to any screen width, its links behave like links, its text can be restyled or extracted afterwards, and it costs a fraction of the size of a PDF.

Export PDF when the page count and the layout are part of the message — something that will be printed, filed, signed or attached to a formal record. Converting Markdown to PDF uses the same theme, so the two exports agree with each other.

And when you simply want the source back, the export menu will hand you the original Markdown unchanged.

Frequently asked questions

How do I convert Markdown to HTML?

Paste your Markdown into Mardna, choose a theme, then open the export menu with ⌘⇧E (Ctrl+Shift+E) and pick HTML. The converted file downloads straight away.

Does the exported HTML need an internet connection?

No. Styles, fonts and diagrams are embedded in the file, so it makes no external requests and renders correctly offline.

Can I publish the exported HTML on my own site?

Yes. It is an ordinary HTML file — host it as it is, or lift the article element and its inlined styles into your own template.

Does the HTML export include syntax highlighting?

Yes. Highlighting is written into the markup as coloured spans, so code blocks look the same in the exported file as they do in the preview.

Is the exported HTML accessible?

It keeps the document semantics: real heading levels with identifiers, table headers, list structure and image alternative text. Whether the result is fully accessible also depends on what the Markdown itself provides — alt text in particular.