Type or paste Markdown on the left and see it rendered as HTML on the right, updated as you type. Headings, bold and italic text, lists, tables, blockquotes, and fenced code blocks all render immediately, with GitHub Flavored Markdown extras like tables and strikethrough included.

How does the live preview work?

Parsing runs on the marked library with GFM support enabled, the same parser behind this site’s Markdown to HTML converter. Every keystroke re-parses the full input and re-renders the preview pane, so there’s no separate “render” step or button to click, and no lag between typing a heading and seeing it appear on the right. Before the HTML touches the page, it’s sanitized with DOMPurify, a library built specifically for stripping dangerous markup out of untrusted HTML. That means pasted content can’t run a script tag or an onerror handler through the preview, which matters because Markdown lets you drop in raw HTML directly, and that raw HTML would otherwise render as-is.

Is anything I type sent to a server?

No. Parsing, rendering, and sanitizing all happen in your browser using JavaScript bundled into the page. No text you type leaves your machine, which matters for unpublished drafts, notes with anything private in them, or a document you’re not ready to save anywhere yet. Because nothing is sent to a server, there’s also no history to clear afterward. Closing the tab is enough.

What is this useful for?

Use it to check how a README will look before committing it, preview a comment or issue body before posting it to GitHub or GitLab, or proofread a table’s column alignment without pushing to a platform that renders Markdown for you. It’s also a quick way to sanity-check that a block of raw HTML pasted into a Markdown file, like an embedded <iframe> or a styled <div>, renders the way you expect, or to see whether a nested list is indented correctly before it goes anywhere public.

See the CommonMark spec for the base syntax, GitHub’s GFM spec for the table and strikethrough extensions, and the DOMPurify project for more on how the sanitization step works.