Markdown to HTML

Turns Markdown into HTML. GFM is fully supported: headings, lists, tables, task lists, strikethrough, fenced code, blockquotes, links and images. The preview below is sandboxed, so any script you paste will not run.

Why a dedicated tool: writing a README, drafting a post, or pasting into a CMS often means "authored in Markdown, delivered as HTML". The conversion is not hard; the details are — table alignment, task-list checkboxes, the language tag on a code fence. Hand-rolling it is where things get missed.

Raw HTML passes straight through, unsanitised. Markdown allows inline HTML and marked complies. So if the Markdown came from a user submission, the output may contain <script> — run your own sanitiser (DOMPurify, for example) before publishing. This tool is for content you wrote, not for content strangers sent you. The preview runs inside a sandboxed iframe for exactly that reason.

Two options:

• Single newline = <br>: in original Markdown a single newline is a space; chat-style writing expects a line break instead. Leave it off for blog posts, turn it on for messages and notes.
• Full HTML document: adds <!doctype html>, <meta charset>, <meta viewport> and a small block of reading styles, so the file opens directly in a browser. Off by default, because a snippet is what you usually paste into an existing page.

The downloaded .html is always a complete document — a bare snippet would open as plain source, which is useless.

Conversion runs in the browser; nothing is uploaded.