How to Preview Markdown as HTML and Copy the Result

Here's the actual process for previewing Markdown as HTML with Markdown to HTML.

Step 1 - type or paste your Markdown

Type directly into the Markdown pane, or paste content from anywhere - a README draft, an AI response, a Notion export. The Preview pane updates as you type, on a short delay so it doesn't try to re-render on every single keystroke.

Step 2 - check the rendered preview

The Preview pane shows real, rendered headings, lists, links, emphasis, and code, exactly as they'd appear published. This is where you catch the things that don't read clearly in raw source - a formatting mark that didn't apply where expected, a line break you meant to add, a list that nested differently than intended.

Step 3 - switch to HTML source if you need it

A Preview / HTML source toggle switches the same pane to show the actual generated HTML markup instead of the rendered result - useful if you're about to paste the HTML somewhere that expects HTML rather than Markdown, like a CMS field.

Step 4 - copy

The Copy button always copies the HTML source, whichever view you happen to be looking at, since that's the form most destinations actually need.

What's supported

Headings (with # or underlined), paragraphs with soft and hard line breaks, backslash escapes and entities, bold and italic (including nested emphasis, with snake_case_names left alone), strikethrough, inline code, fenced and indented code blocks, links and images (inline, reference-style and autolinks), blockquotes, ordered and unordered lists (nested, tight or loose, task checkboxes included), tables, and horizontal rules. Footnotes and definition lists aren't supported, and raw HTML is never rendered - it is shown as the text it is.

Why there's no error state to design around

Unlike JSON or a regex pattern, Markdown doesn't really have invalid syntax - a permissive renderer always produces something. An unmatched `**` or a malformed link just falls through to plain text rather than breaking anything else on the page.

Nothing here uploads anywhere

Rendering happens entirely inside the browser tab, synchronously, as you type.

For why previewing matters before you publish, see the background piece. For what happens if your Markdown contains raw HTML or a script tag, this guide covers it. Or preview Markdown now.