A native macOS app for viewing and editing markdown files. WYSIWYG editing meets lightweight design. Just open, edit, preview, and save. Your files stay local.
Automatically generates a table of contents from document headings.
Formatting is applied instantly as you type Markdown syntax.
Supports tables, checklists, and code syntax highlighting.
Launches instantly and uses minimal system resources.
Works completely offline. No internet connection required.
Built specifically for macOS with Universal Binary support for Intel and Apple Silicon Macs.
AI tools generate markdown. You need a fast way to review and edit their output.
AI assistants generate long markdown responses. MarkViewer's auto table of contents lets you navigate AI-generated docs instantly.
Ask Claude to write documentation โ Save as .md โ Review in MarkViewer โ Make quick edits โ Done. No heavy IDE needed.
Downloaded AI-generated markdown? Review it offline without browser tabs, cloud sync, or internet connection.
Claude Projects stores knowledge as markdown files. ChatGPT outputs complex responses in markdown format. GitHub Copilot Workspace uses markdown for planning. AI tools have standardized on markdown as the lingua franca of documentation.
MarkViewer is purpose-built for this new workflow: fast viewing, quick editing, zero setup.
Real scenarios from real users
Download release notes from GitHub. Open in MarkViewer for a clean, formatted view with table of contents. Review breaking changes and new features without switching browser tabs.
For: Software teams, product managers, engineers
Writing a README or documentation? Edit markdown with instant WYSIWYG formatting. See changes as you type. Fix typos, update sections, and saveโall without launching a heavy IDE.
For: Developers, writers, bloggers, students, anyone editing docs
Working on a flight or with unreliable internet? Open local markdown documentation. MarkViewer's table of contents makes navigation easy. Everything works offline, no web server needed.
For: Remote workers, frequent travelers, students
MarkViewer is built for one specific job: fast, lightweight markdown viewing. It's not trying to be a full-featured IDE or note-taking system.
โN New Document, โO Open, โS Save
Adjust TOC and editor sizes
Automatic smart quotes and ellipsis conversion
Full integration with file dialogs and menus
Auto-detect changes and save notifications
Clean interface that enhances focus
Yes, MarkViewer is completely free. There are no paid tiers, subscriptions, or hidden costs. Download and use it forever.
Yes, MarkViewer works 100% offline. All files are processed locally on your Mac. No internet connection required, no cloud sync, and your documents never leave your computer.
MarkViewer supports GitHub Flavored Markdown (GFM) including tables, task lists, code blocks with syntax highlighting, and standard markdown syntax. It handles .md and .markdown files.
Yes. Download release notes as .md files from GitHub and open them in MarkViewer for a clean, formatted reading experience. Great for checking changelogs and release details offline.
MarkViewer is purpose-built for reading and quick previewing, not heavy development or note-taking. It's lightweight, launches instantly, and doesn't require workspace setup. Think of it as Preview.app for markdown files.
No. MarkViewer has no cloud features, no accounts, and no sync. It's a local-only app. Your files stay on your Mac, exactly where you saved them.
MarkViewer requires macOS 10.13 (High Sierra) or later. It's a Universal Binary that runs natively on both Intel and Apple Silicon Macs.
Absolutely. MarkViewer processes everything locally on your device. Your markdown files never leave your computer. The desktop app includes optional, opt-in analytics (disabled by default) to help improve the product. The website uses standard analytics to understand usage. No personal information is collected. See our Privacy Policy for full details.
MarkViewer