How to Preview Markdown Files Directly in macOS Finder

You know that thing where you press Space on a file in Finder and get an instant preview? It works for images. PDFs. Videos. Even 3D models. But try it on a .md file. Nothing useful. Just raw text in a monospace font. Here's how to fix that — and turn your Finder into a proper Markdown previewer. What QuickLook actually is For those unfamiliar: QuickLook is a macOS feature that renders a file preview when you press the spacebar in Finder. No app launches. No window management. Just instant preview. Developers use it constantly without thinking about it. You select a .png and press Space to check the right asset. You select a .pdf to skim a doc without opening Preview. It's muscle memory. The problem is that macOS ships with no QuickLook support for Markdown. Press Space on README.md and you get the same experience as opening it in TextEdit — raw syntax, no rendering. Which is wild, because Markdown is arguably the most common documentation format in software development. The setup (tak