What free means here
Creating an account costs nothing, and a free account comes with monthly credits. The page you download is exactly the one a paid plan gets: no watermark, no banner, no link back to us inserted into your HTML, no output cut short.
Why not a local tool?
If you convert Markdown every day, a local setup pays off. If you need one clean HTML page now, installing and configuring a converter costs more time than the conversion itself. Here the engine is already set up: it is pandoc, the same open-source converter you would install.
A complete page, not a snippet
The result opens directly in a browser, with its own <head>. Headings, lists, tables, code blocks, links and footnotes come out as standard tags, so the file also works as a starting point for a template of your own.