Markdown

Markdown goes to PDF through the same engine as HTML: it is turned into HTML with a GitHub-like stylesheet first, so everything on HTML and CSS support applies to it. You can also stop at the HTML.

// Markdown to PDF, styled like a GitHub README
byte[] pdf = MarkdownToPdf.Convert(File.ReadAllText("README.md"));

// File to file; relative image paths resolve against the Markdown file's folder
MarkdownToPdf.ConvertFile("README.md", "README.pdf", new PdfOptions { FooterText = "Page {page} of {pages}" });

// Markdown to HTML: a body fragment, or a complete page with the stylesheet
string fragment = MarkdownToHtml.Convert("# Hello\n\n*World*");     // <h1 id="hello">Hello</h1>\n<p><em>World</em></p>
string page = MarkdownToHtml.ConvertDocument(markdown);
MarkdownToHtml.ConvertFile("README.md", "README.html");

MarkdownOptions switches the GitHub extensions off for strict CommonMark (GitHubExtensions = false), drops heading ids (HeadingIds = false), shows raw HTML as text (AllowRawHtml = false), replaces the stylesheet (StyleSheet, see MarkdownToHtml.DefaultStyleSheet) or sets the title (default: the first heading). MarkdownToPdf takes PdfOptions and MarkdownOptions side by side.

What is supported

CommonMark 0.31 (651 of the 652 spec examples pass; the one miss is an exotic HTML5 entity name) plus the GitHub Flavored Markdown extensions: tables with column alignment, ~~strikethrough~~, task list items (- [x]) and bare www./https:///e-mail autolinks. Headings get GitHub-style ids, so [see below](#heading-text) links work in the PDF too. The parser runs in linear time on hostile input (deep nesting, unclosed brackets, long delimiter runs). See Limitations for what is not supported.