Free Online Markdown to HTML Converter
Turn Markdown into clean, sanitized HTML with GFM support
<h1>Hello World</h1>
<p>This is <strong>bold</strong> and <em>italic</em> text.</p>
<h2>Features</h2>
<ul>
<li>List item 1</li>
<li>List item 2</li>
<li>List item 3</li>
</ul>
<h3>Code Example</h3>
<pre><code class="language-javascript">const greeting = "Hello, World!";
console.log(greeting);
</code></pre>
<h3>Table</h3>
<table>
<thead>
<tr>
<th>Name</th>
<th>Value</th>
</tr>
</thead>
<tbody><tr>
<td>Alpha</td>
<td>1</td>
</tr>
<tr>
<td>Beta</td>
<td>2</td>
</tr>
</tbody></table>
<blockquote>
<p>This is a blockquote.</p>
</blockquote>
<p><del>Strikethrough text</del> and a <a href="https://example.com">link</a>.</p>
<ul>
<li><input checked="" disabled="" type="checkbox"> Task complete</li>
<li><input disabled="" type="checkbox"> Task pending</li>
</ul>
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Why use Markdown to HTML Converter
- Full GitHub Flavored Markdown support -- tables, strikethrough, task lists, fenced code blocks with language classes.
- Toggle between raw HTML and rendered preview so you can proofread visually and copy markup in one workflow.
- Output is DOMPurify-sanitized, so it's safe to paste into a CMS or email template without XSS concerns.
- Handles nested lists, block quotes inside lists, and inline HTML that simpler converters mangle.
- Uses marked.js -- the same parser behind many production documentation sites.
How it works
The converter uses the marked.js library to parse Markdown source into an abstract syntax tree (AST) of tokens -headings, paragraphs, list items, code blocks, emphasis, links, and so on. Each token type has a corresponding HTML rendering rule: a level-2 heading becomes <h2>, bold text becomes <strong>, a fenced code block becomes <pre><code class="language-x">. The parser processes the input in two passes: a block-level pass that identifies structural elements (headings, lists, blockquotes, tables) and an inline pass that processes emphasis, links, and code spans within each block. GitHub Flavored Markdown extensions add additional rules for table syntax (pipe-delimited rows), strikethrough (~~text~~), and task list items (- [x]). After rendering, the HTML output is run through DOMPurify, which strips <script> tags, event handler attributes, and other potentially dangerous constructs while preserving safe structural elements.
About this tool
Paste your Markdown, get clean HTML. Toggle between the raw source and a rendered preview to check that headings, lists, and tables look right before you copy anything. The converter supports GitHub Flavored Markdown (GFM) -- tables, strikethrough, task lists, autolinks, fenced code blocks with language classes -- which covers what you'd find in a GitHub README, a wiki, or a docs-as-code repo. Output is sanitized with DOMPurify, so script tags and event handlers get stripped. You can paste the result into a CMS, an email template, or a static HTML page without worrying about XSS. Under the hood it uses marked.js, the same parser many documentation sites use in production. Nested lists, block quotes, and inline HTML all survive the conversion.
How to use Markdown to HTML Converter
- Paste your Markdown. Drop your .md content into the left panel -- headings, bold, lists, tables, code blocks, whatever you've got.
- Preview the rendered output. Toggle to Preview to see how the HTML will look in a browser. Check heading levels, list nesting, and table alignment.
- Switch to HTML source. Toggle to HTML mode to see the raw markup. This is what you'll copy for your CMS, email template, or code file.
- Copy the HTML. Click Copy HTML. The output is clean, structural HTML with no inline styles or scripts.
Use cases
- You wrote docs in Markdown in VS Code, but the legacy CMS only accepts HTML. Paste the .md content, copy the output, drop it in.
- Your weekly newsletter is drafted in Markdown. Convert it to HTML and paste it into Mailchimp's editor without losing headings, lists, or code blocks.
- Compare the rendered preview against your design to catch heading-level mismatches before pushing a blog post live.
Frequently Asked Questions
Markdown is a lightweight text formatting language created by John Gruber in 2004. It uses simple symbols -# for headings, ** for bold, * for italic, - for lists -to format text without a visual editor. Markdown files (.md) are used for README files on GitHub, documentation, blog posts, and technical writing. It converts cleanly to HTML while remaining readable as plain text.
GFM is GitHub's extended version of standard Markdown. It adds tables (using | pipes), strikethrough (~~text~~), task lists (- [x] done, - [ ] todo), autolinked URLs, and fenced code blocks with syntax highlighting hints (```javascript). This converter supports all GFM features, so your GitHub README content will convert correctly.
Yes. This tool sanitizes the HTML output using DOMPurify before displaying it, which removes any potentially dangerous scripts or attributes. The output is safe to use directly on your website. If you are processing untrusted Markdown on your own server, we recommend also running DOMPurify or a similar sanitizer on the server side.
This tool converts Markdown to HTML only (one direction). Converting HTML back to Markdown is a much more complex problem because HTML can represent structures that have no Markdown equivalent. For HTML-to-Markdown conversion, look for tools that use libraries like Turndown.js.
The converter renders fenced code blocks (``` language) as <pre><code class="language-name"> elements with the language class applied. Syntax highlighting colors are not added by the converter itself -you need to include a client-side highlighting library like Prism.js or highlight.js in your target page to apply colors based on those class names.
Yes. Open the README.md file in any text editor, select all, and paste the content into this tool. It supports GitHub Flavored Markdown including tables, strikethrough, task lists (- [x] and - [ ]), and fenced code blocks -all features commonly found in GitHub READMEs convert correctly.
Standard Markdown allows inline HTML. If your Markdown contains raw <div>, <span>, or <table> tags, they are passed through to the HTML output unchanged. However, the output is sanitized with DOMPurify before display, which removes <script> tags and event handler attributes. Structural HTML elements come through intact.
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