What it does

• Rich rendering. Headings, lists, task lists, blockquotes, links, bold, italic, strikethrough and inline code.
• Syntax-highlighted code. Fenced code blocks highlighted with a clean GitHub-style theme, light and dark.
• Real tables. GitHub-flavored Markdown tables render as native AppKit tables — not raw pipes.
• Sandboxed & offline. Runs in a sandboxed Quick Look extension with no network access. A menu-bar helper, no Dock icon.

Install

1. Download & open the disk image. Drag Markdown QuickLook into your Applications folder.
2. Launch it once. Open it from Applications. It lives in the menu bar and registers the Quick Look extension.
3. Press space. Select any .md file in Finder and hit space. If an old preview is cached, use the menu-bar item → Reset Quick Look Cache.