Online Markdown to HTML Converter — Free, No Upload

Turn Markdown into clean, ready-to-paste HTML

This free online Markdown to HTML converter takes the lightweight syntax you write in READMEs, documentation, blog posts, and email drafts and turns it into valid HTML you can copy or download. Whether you are publishing to a CMS, feeding a static site generator, or building an HTML email, you type in the left panel and the output updates the instant you stop — there is no “Convert” button to press, because the live preview re-renders on every keystroke.

Everything runs locally in your browser using the marked.js parser, so your Markdown is never uploaded, queued, or logged — no login, no file to send, no server round-trip. Once you have the HTML you can URL-encode the output for a query string, or tidy a related data payload with the JSON formatter.

Markdown syntax cheatsheet: what maps to what

Markdown is a set of shorthand characters that the parser rewrites into HTML tags. Here is every common construct, the exact HTML the converter emits for it, and how it renders. Block elements — headings, lists, blockquotes — start on their own line; inline elements — bold, links, code — live inside a line of text.

The last four rows — tables, strikethrough, task lists, and fenced code — are GitHub Flavored Markdown (GFM) extensions, which the marked parser enables by default, so a GitHub README pastes in and converts without extra setup.

How the conversion works — and what it will not do

Under the hood the tool hands your text to marked, a widely used JavaScript Markdown parser, and drops the result into two places: a rendered Preview styled with clean typography, and a raw HTML tab you can read and copy verbatim. A small stats line reports the character count, line count, and the size of the generated HTML, so you can watch the output grow as you type.

Copy and Download are different outputs. “Copy HTML” gives you the bare tags — <h1>, <p>, <ul> and friends — with no styling, ideal for pasting into a page that already has its own CSS. “Download .html” wraps those same tags in a complete, standalone document with a <!DOCTYPE>, a viewport meta tag, and a small built-in stylesheet, so the file opens looking readable in any browser.

It parses, it does not sanitize. marked passes raw HTML embedded in your Markdown straight through, and it does not colour-highlight code — a fenced block becomes a plain <pre><code> pair, with a language class but no token colours until you add your own highlighter or CSS. Because the output is not sanitized, avoid pasting untrusted Markdown that contains scripts into a production app without running it through a sanitizer first.

A worked example: a README snippet, converted

Paste this Markdown into the editor on the left:

## Install

Run `npm install`, then start the dev server:

```bash
npm run dev
```

See the [docs](https://example.com) for **advanced** options.

- Fast refresh
- Zero config

The HTML tab shows exactly this, ready to copy or download:

<h2>Install</h2>
<p>Run <code>npm install</code>, then start the dev server:</p>
<pre><code class="language-bash">npm run dev
</code></pre>
<p>See the <a href="https://example.com">docs</a> for <strong>advanced</strong> options.</p>
<ul>
<li>Fast refresh</li>
<li>Zero config</li>
</ul>

Notice how each blank-line-separated block becomes its own element: a heading turns into <h2>, prose is wrapped in <p>, the fenced block keeps its language as a class, and the dash list becomes a <ul>. That predictability is what makes Markdown safe to paste into a documentation site, a blog CMS, or an HTML email template.

How it compares to other Markdown tools

Plenty of editors and libraries render Markdown; they differ mostly in where they run and how much setup they need. Exact features and pricing vary and change over time, so treat this as a rough map rather than a spec sheet:

If you just need to drop a chunk of Markdown in and get the HTML back out, pasting it here is usually the shortest path. If you are writing all day and want cloud sync, a dedicated editor may suit you better; if you are automating conversions across dozens of files, a command-line tool like Pandoc will scale further.

Common mistakes — and how to avoid them

Single line breaks did not start a new paragraph

Markdown treats a lone newline as a soft wrap. Leave a blank line between blocks to get separate <p> tags, or end a line with two trailing spaces to force a single <br>.

Your table or task list rendered as plain text

GFM tables need a header row and a divider row of pipes and dashes — a line like | A | B | above |---|---|. Task lists need the exact - [ ] or - [x] pattern at the start of a list item.

Code inside a fence lost its symbols or indentation

Wrap code in triple-backtick fences rather than indenting each line by four spaces — fences preserve every character exactly and let you name the language for later syntax highlighting.

The downloaded file looks styled but the copied HTML does not

That is expected: Download injects a small built-in stylesheet, while Copy HTML returns unstyled tags. Wrap the copied markup in your own CSS, or keep the download when you want something readable straight out of the box.

Raw HTML in your Markdown showed up verbatim

marked lets inline HTML pass through by design, so a stray <div> in the source is kept rather than escaped. Remove it if you only want the tags generated from Markdown syntax.

Frequently asked questions