Markdown to HTML Converter Online Free
Markdown to HTML Converter is a free online tool that converts Markdown syntax to HTML in real time, with a live rendered preview. It uses the marked library with GitHub Flavored Markdown support, runs entirely in your browser, and lets you copy the HTML source or download it as a file — no account, no upload required.
How to Convert Markdown to HTML Online
- 01
Write or paste Markdown
Type directly in the editor or paste from a file, note, or CMS. Use the toolbar shortcuts to insert bold, italic, headings, links, code, or lists. The output updates live as you type.
- 02
View the preview or HTML source
Toggle between "Preview" (rendered HTML) and "HTML Source" (raw markup) on the right panel. The preview renders in real time so you can see exactly how the Markdown will look.
- 03
Copy or download
Click "Copy HTML" to copy the generated markup to your clipboard, or "Download .html" to save a file. You can also copy the original Markdown with "Copy MD".
Features
- ✓Live preview with 300ms debounce
- ✓Toggle between rendered preview and HTML source
- ✓Toolbar shortcuts for bold, italic, heading, link, code, list
- ✓GitHub Flavored Markdown (GFM) support
- ✓Copy HTML or Markdown to clipboard
- ✓Download output as .html file
- ✓100% client-side — content never leaves your browser
- ✓No login, no file upload, no sign-up
Frequently Asked Questions
What Markdown flavour does this converter support?
The converter uses the marked library configured with GitHub Flavored Markdown (GFM) and line breaks enabled. This means it supports standard Markdown headings, bold, italic, links, images, code blocks, blockquotes, ordered and unordered lists — plus GFM extensions like strikethrough and tables.
Is the HTML output sanitised against XSS attacks?
The preview renders HTML using dangerouslySetInnerHTML, which means script tags in your Markdown would execute in the preview. This is intentional for a developer tool — you are converting your own Markdown. Do not paste untrusted Markdown from unknown sources. The HTML source output itself is plain text and safe to inspect.
Can I convert a Markdown file instead of pasting text?
Currently the tool works with pasted text. Copy the contents of your .md file and paste it into the editor. File upload support may be added in a future version.
What does the Download .html button produce?
It downloads a plain .html file containing only the converted HTML fragment — not a complete HTML document with <html>, <head>, and <body> tags. This is suitable for embedding in an existing page. If you need a complete standalone document, wrap the output in a standard HTML boilerplate.
Does the converter work offline?
Once the page has loaded, the converter works entirely in your browser. No network requests are made during conversion — the marked library runs locally. If you lose internet access after loading the page, conversion continues to work.