Markdown on a Mac.
Six guides, one per question people actually ask: previewing in Finder, opening .md files, annotating for review, diagrams and maths, the agent workflow, and which viewer to pick.
macOS 14+ · 5.8 MB
Markdown Quick Look for Mac
Quick Look Markdown on Mac: Free Space Bar Preview
Preview Markdown in Finder with the space bar. A free, open source Quick Look extension that renders headings, code, tables, Mermaid diagrams and maths, offline.
Read the guideOpen .md files on Mac
How to Open MD Files on Mac: 4 Ways (2026)
Four ways to open .md files on a Mac, compared: TextEdit, an editor preview, Quick Look in Finder, and a free Markdown viewer. Plus how to set the default app.
Read the guideMarkdown review comments
Annotate Markdown for Review: Notes Inside the File
Review a Markdown document by commenting on exact phrases. The notes are saved inside the .md file, travel through Git and email, and stay invisible in every other viewer.
Read the guideTechnical Markdown
Free Markdown Viewer with Mermaid and KaTeX for Mac
Read Markdown with Mermaid diagrams, KaTeX maths, highlighted code, tables and local images. Free, open source, and rendered entirely on your Mac, offline.
Read the guideAgent skill for Markdown review
Imark Skill for Claude Code and Codex: Review Plans on Your Mac
Give Claude Code and Codex a human review gate. The free Imark skill opens the plan in a Mac app, waits for your decision, and returns comments anchored to exact phrases.
Read the guideChoose a Markdown app
Best Free Markdown Viewer for Mac (2026)
Three Mac Markdown viewers side by side in 2026: Imark, MacMD Viewer and QLMarkdown, compared on Quick Look, Mermaid, maths, live reload, comments, licence and price.
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