Markdown ↔ HTML Converter

About Markdown to HTML Converter

Markdown to HTML Converter transforms Markdown syntax into clean, properly indented HTML using the marked.js parser and js-beautify formatter. It supports the full GitHub Flavored Markdown (GFM) spec including fenced code blocks, tables, task lists, strikethrough, and autolinks. An HTML-to-Markdown reverse mode is also available for extracting plain Markdown from existing web content.

A live preview pane renders the converted HTML visually so you can verify headings, lists, and tables look correct before exporting. Conversion updates automatically as you type in the Markdown input. All processing runs in the browser via marked.js — your content is never sent to a server.

Common Use Cases

• Converting a README.md or documentation file written in Markdown into embeddable HTML for a company wiki, CMS, or email template.
• Extracting clean Markdown from a blog post or web page's HTML source to reuse the content in a different publishing platform.
• Quickly previewing how a Markdown document will look when rendered — useful for README files before pushing to GitHub.
• Generating HTML snippets from structured Markdown for use in static site generators like Jekyll, Hugo, or Eleventy that accept raw HTML partials.

How to Use

1. Choose the direction: "Markdown → HTML" to convert Markdown source to HTML, or "HTML → Markdown" to reverse the process.
2. Type or paste your content into the Input panel — the output updates automatically as you type.
3. Click the "Preview" button to open a rendered HTML preview panel that shows how the output will look in a browser.
4. Click "Copy" to copy the output to your clipboard, or "Load Example" to see a sample document demonstrating all supported Markdown features.

Frequently Asked Questions

What Markdown features are supported?

This converter uses marked.js with GitHub Flavored Markdown (GFM) enabled by default. Supported features include headings (#, ##, ###), bold and italic text, unordered and ordered lists, fenced code blocks with language hints (```javascript), blockquotes, horizontal rules, inline code, hyperlinks, images, GFM tables, task lists (- [x]), strikethrough (~~text~~), and autolinked URLs.

How accurate is the HTML → Markdown reverse conversion?

The reverse conversion uses a set of regex-based replacements that handle the most common HTML elements (headings, paragraphs, lists, links, images, code, blockquotes). It works well for clean, semantic HTML but may not perfectly reconstruct complex nested structures, custom attributes, or heavily styled HTML. For best results, use it on simple blog or documentation HTML rather than full website source code.

Is the generated HTML safe to use directly on a webpage?

marked.js does not sanitize the output HTML by default. If the Markdown input contains raw HTML or JavaScript (e.g., <script> tags), those will pass through to the output. If you are rendering user-submitted Markdown in a web app, always sanitize the output with a library like DOMPurify before inserting it into the DOM to prevent Cross-Site Scripting (XSS) attacks.