Markdown to HTML Converter
Convert Markdown to clean HTML and see a rendered preview, entirely in your browser. CommonMark + GitHub tables. Nothing is uploaded.
Private by construction. The conversion happens in this page's JavaScript. Nothing you paste here leaves your machine, and the tool keeps working with the network unplugged.
Write or paste Markdown on the left; the raw HTML appears on the right and a rendered preview appears underneath, so you can check both what the markup is and what it looks like. Conversion uses marked, a widely used CommonMark-compliant parser, with GitHub-style extensions: tables, fenced code blocks, task lists, and strikethrough all work. The HTML output is unstyled and portable — paste it into a CMS, an email template, or a static site. And because the parser runs in this tab, drafts never leave your machine.
Questions this tool gets asked
Which Markdown flavor is this?
CommonMark via the marked parser, with GitHub Flavored Markdown extensions enabled: pipe tables, fenced code blocks, autolinks, and strikethrough. If it renders on GitHub, it should convert here.
Is the HTML output sanitized?
No - conversion is faithful, so raw HTML embedded in your Markdown passes through. That is what you want for your own documents. If you republish Markdown from strangers, run the output through a sanitizer like DOMPurify server-side.
Why does my nested list render flat?
Markdown nesting is indentation-sensitive: nested list items need consistent leading spaces (2-4 depending on the marker). Mixed tabs and spaces are the usual culprit.
Can I convert HTML back to Markdown?
Not with this tool - that reverse conversion is lossy and heuristic. This tool does the well-defined direction: Markdown to HTML.