Writing a README or documentation? See your markdown rendered in real-time without launching VS Code. MarkViewer gives you instant WYSIWYG preview as you type.
Free • Offline • macOS 10.13+
You're writing markdown — a README, documentation, or a technical blog post. You need to see how it renders. But you don't want to:
MarkViewer makes markdown preview simple.
MarkViewer applies formatting instantly as you type markdown syntax. No separate preview pane needed. See exactly how your markdown will render, right as you write.
Type markdown syntax and see it rendered instantly. Headings, bold, italic, links — all formatted as you write.
Automatically generated TOC from your headings. Navigate long documents with ease.
Code blocks are highlighted with proper syntax coloring. JavaScript, Python, Go, and more.
Full GitHub Flavored Markdown support. Tables, checklists, strikethrough — all rendered perfectly.
Launches in under a second. No workspace loading. Just open your .md file and start writing.
Everything runs locally. No cloud, no uploads, no tracking. Your documents stay on your Mac.
MarkViewer isn't a replacement for a full markdown editor like Typora or a code editor like VS Code. It's for when you need to:
Previewing markdown is step one. Reviewing it with your AI assistant is step two. MarkViewer now closes the loop: highlight a passage, leave an inline comment, press ⌘⇧↵, and paste the generated prompt into Claude, ChatGPT, Cursor, Gemini, or Copilot.
Press ⌘⇧R on any selection to leave a review comment. Annotations are stored as HTML comments inside the markdown, so they survive save/reload and don't affect rendering.
Press ⌘⇧↵ to open a floating panel with the rendered prompt. Edit freely, save as your default template, or reset.
Claude, ChatGPT, Cursor, GitHub Copilot, Google Gemini, Codex CLI, local LLMs — if it accepts pasted text, it works. No API key, no internet requirement inside MarkViewer.
MarkViewer never hijacks your clipboard. The prompt is only copied when you click Copy — no surprises, no stolen focus.
The pitch: AI writes drafts, humans review them. Until now, reviewing a Claude-generated README meant copy-pasting chunks back and forth. The AI Review Loop keeps your annotations attached to the file and makes the handoff one keystroke.
Yes! When Claude or ChatGPT generates markdown content, you can save it as a .md file and edit it in MarkViewer. The WYSIWYG editor makes it easy to fix formatting or add your own notes.
MarkViewer is a native macOS app that works 100% offline. No internet required, no files uploaded to servers. It's also faster than browser tools and integrates with your Mac's file system.
MarkViewer supports GitHub Flavored Markdown (GFM) including tables, task lists, and code syntax highlighting. The rendering is very close to what you'll see on GitHub.
MarkViewer focuses on viewing and editing markdown files. For export features, consider using Typora or pandoc. MarkViewer's strength is being lightweight and fast for everyday markdown tasks.
Yes — MarkViewer's AI Review Loop lets you annotate any passage, then press ⌘⇧↵ to open an editable prompt panel. Copy the prompt into Claude, ChatGPT, Cursor, Gemini, or any AI assistant.
No. MarkViewer itself is 100% offline and never contacts any AI service. You paste the generated prompt into whichever AI tool you already use — the review loop is a handoff, not an integration.
Start previewing markdown the simple way. Free for macOS 10.13 and later.
Download for Mac (Free)v1.0.34 • Universal Binary (Intel & Apple Silicon)
MarkViewer