What "free" actually means here
Lots of "free Markdown to HTML" tools come with hidden costs: mandatory account creation that hands your email to a marketing pipeline, output truncated to N characters with a "go pro to convert the rest" wall, ads injected into the HTML output, or a quietly-tracked usage cap that surfaces only when you hit it mid-task. Ours doesn't. Drop your Markdown, hit convert, get the full HTML back, no signup, no caps below ~5 MB output.
Why bother with a converter at all?
You can convert Markdown to HTML in five seconds with npx marked if you have Node installed — or with pandoc if you have Pandoc installed. The reason a web tool exists is because most people don't want to install anything for a one-off conversion. Paste, convert, copy, done. Same engine you'd get from a CLI tool, no install required, no terminal, no path issues, works on a Chromebook in a library.
What you get
Clean semantic HTML — same output as our full Markdown to HTML converter at default settings. GitHub-flavored Markdown spec, semantic <h1>-<h6>, real <table> with <thead>/<tbody>, fenced code blocks with language-X classes for any syntax highlighter, no inline styles, no surprise <div> wrappers.