Markdown Preview provides a Quick Look extension to preview Markdown files in Finder. Before started, you will need to enable Quick Look extension in System Settings. Afterwards you can press spacebar or ⌘ + Y to quick look .md files in Finder. You can also switch between preview and the original Markdown content. Support formats: - Markdown. - Markdown with KaTex. - Markdown with Mermaid diagram. - Source code syntax highlighting. - TextBundle.