Markdown to HTML Converter

A Markdown to HTML converter is a tool that translates Markdown syntax — plain text symbols like # for headings and **text** for bold — into the equivalent HTML markup that web browsers render. Markdown was invented by John Gruber in 2004 with the goal of being readable in raw form while producing clean HTML output; today it is the standard writing format for GitHub, Notion, Reddit, and most modern CMSes.

This converter uses Marked.js with GitHub Flavored Markdown (GFM) enabled, running entirely in your browser. GFM extends standard Markdown with tables, task lists, strikethrough, and fenced code blocks — the same extensions GitHub uses. All HTML output is passed through DOMPurify before preview rendering to strip any embedded JavaScript, making it safe to convert untrusted content.

1. Paste or type your Markdown — enter your Markdown text in the left panel; the converter processes it in real time as you type.
2. Preview the rendered HTML — the right panel shows a live rendered preview so you can confirm formatting before exporting.
3. Inspect the raw HTML output — switch to the HTML tab to see the exact markup the converter generated, including all tags.
4. Copy or export — click the copy button to grab the HTML string, or use the export function to download an .html file.

• Developers building content pipelines who need to convert Markdown files to HTML strings for APIs, databases, or server-side templates.
• Technical writers publishing to multiple platforms who draft documentation in Markdown but need HTML output for legacy CMSes or email systems that don't accept raw Markdown.
• Bloggers who write in Markdown in editors like Obsidian or Typora and publish to HTML-based CMS platforms where the Markdown doesn't render natively.

• Privacy — all conversion runs in your browser using Marked.js; your content never touches a server.
• Free — no subscription, no account, no character limits.
• No account required — open the page and start converting immediately.
• GitHub Flavored Markdown support — tables, task lists, strikethrough, and fenced code blocks all convert correctly.

• Not sanitizing HTML output: Markdown allows raw HTML inline. If you convert untrusted Markdown without sanitizing the output, embedded <script> tags will execute in the browser. Always run output through a sanitizer like DOMPurify before rendering.
• Inconsistent heading hierarchy: Jumping from # (h1) directly to ### (h3) breaks accessibility and screen reader navigation. It also causes issues with automatically generated tables of contents.
• Forgetting to escape literal asterisks and brackets: To display a literal asterisk or bracket in Markdown, prefix it with a backslash: \* and \[. Unescaped, they trigger bold, italic, or link syntax unexpectedly.
• Mixing HTML and Markdown unpredictably: When you embed raw HTML inside a Markdown document, Markdown processors stop parsing Markdown inside that HTML block. You cannot use **bold** inside a <div> and expect it to render as bold.

If your HTML output contains special characters that need escaping before being placed in another context, the HTML entity encoder handles that step. To compare two versions of a Markdown document before and after edits, use the diff checker.

Further reading: CommonMark Specification (commonmark.org)

Converting a README.md to an HTML snippet for embedding on a product landing page or documentation site. Preparing email newsletter content drafted in Markdown for an HTML email template. Migrating blog posts from a Markdown-based static site (like Jekyll or Hugo) to a legacy WordPress or Drupal installation that stores and renders raw HTML. Testing how Markdown renders before committing documentation to a repository.