Markdown to HTML Converter
Convert Markdown — headings, lists, task items, code blocks, blockquotes, tables, links, images, bold and italic — into clean HTML with a preview; HTML escaped.
Ready-to-paste HTML (a fragment or a full document) from your Markdown, a rendered preview, and counts of the headings, lists, links and blocks it produced.
Example: “# Release notes”, a paragraph with **bold**, a nested list with a [x] task, a ```js block and a pipe table become h1, p/strong, ul/li with a checkbox, pre/code and an aligned table.
The everyday subset,
converted predictably.
Exactly which Markdown the converter understands, what it does with HTML in the source, and what it leaves out.
What is supported
Blocks: # to ###### headings and the underlined (setext) forms, paragraphs, fenced code blocks with a language class, blockquotes (nested content allowed), bullet (- * +) and numbered lists nested by indentation, GFM task items [ ] and [x], horizontal rules, and pipe tables with an alignment row. Inline: **bold**, *italic*, ~~strikethrough~~, `code`, [links](url "title"), , <autolinks>, backslash escapes, and two trailing spaces for a line break. It is an in-house converter written for this page, not a full CommonMark implementation: the constructs above are handled by the rules stated here and the CommonMark spec is the reference for what they mean.
HTML and safety
Any HTML tag in the source is escaped by default and appears as text, so pasted Markdown cannot inject markup. Switch to “allow raw HTML” to pass tags through — the page then warns if it sees script, iframe, object or embed tags. Link and image URLs beginning with javascript:, vbscript: or data: are replaced with #. The preview renders the generated HTML inside a sandboxed frame.
Not covered
Reference-style links, footnotes, definition lists, HTML blocks with Markdown inside, indented (four-space) code blocks and nested emphasis edge cases are outside the subset. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.
SOURCES
- CommonMark Spec 0.31 — block and inline structure (the subset implemented is listed on the page)
- GitHub Flavored Markdown Spec — tables, task list items, strikethrough
Last reviewed 19 September 2026. How results are checked: How we verify.