Markdown to HTML: Syntax, GitHub Flavored Extensions, and Safety
Markdown is a lightweight markup language that lets writers format text using plain, readable syntax instead of brittle HTML tags. A Markdown to HTML converter transforms that syntax into semantic HTML you can drop into a website, README, or CMS. This tool follows the CommonMark specification and adds GitHub Flavored Markdown (GFM) conveniences.
Supported Syntax
Out of the box you get headings (# through ######), bold (**text**), italic (*text*), strikethrough (~~text~~), links ([text](url)), images (), inline and fenced code blocks, blockquotes, ordered and unordered lists, and horizontal rules (---). Fenced code blocks retain their language hint in alanguage-xxx class for syntax highlighters.
GitHub Flavored Markdown Extensions
Beyond standard Markdown, GFM brings tables (pipe-delimited with a header separator row), task lists (- [ ] and - [x]), strikethrough, and autolinks for bare URLs. These are essential for documentation, issues, and pull-request descriptions on GitHub.
Is the Conversion Secure?
Because this converter runs entirely in your browser, your content never leaves the page. However, Markdown allows raw HTML passthrough, and the generated output is HTML. If you render that HTML on a server or share it with others, sanitize it first — for example withDOMPurify or sanitize-html — to neutralize scripts and prevent cross-site scripting (XSS) when the source is user-generated.
Workflow Tips
Use the live split-pane preview to catch formatting mistakes as you type, then copy the HTML directly or download a standalone .htmlfile. The stats bar tracks characters, words, lines, and an estimated reading time so you can keep documentation concise and scannable.