MDViewer+

A minimal macOS Markdown editor and viewer. Clean rendering, inline editing, and live preview — no bloat.

Features

• Three view modes — view-only, split (editor + preview), and edit-only, cycled with Cmd+E
• Live preview — edits render instantly in the side-by-side split view
• Syntax highlighting — headings, bold, italic, links, code blocks, blockquotes, and list markers color-coded in the editor
• Scroll sync — bidirectional scroll synchronization between editor and preview
• Markdown formatting — Bold (Cmd+B), Italic (Cmd+I), Link (Cmd+K)
• GitHub-flavored rendering via marked.js
• Dark Mode — automatic (system), light, or dark via View > Appearance
• Print — Cmd+P opens the native macOS print dialog with paginated A4 output
• Context-aware zoom — Cmd+/Cmd- targets the active pane: preview in view mode, editor font in edit mode, focused pane in split mode
• New files — Cmd+N creates a blank Markdown document
• Native file handling — Open, Save, Recent Files, drag & drop
• 360 KB total — no Electron, no runtime, no dependencies

Performance

Metric	Value
App size	360 KB
Download (zip)	< 150 KB
Cold start	< 50 ms
Memory	~112 MB

Install

Download the latest .app from Releases or build from source:

brew install xcodegen
xcodegen generate
xcodebuild -scheme MDViewerPlus -configuration Release build

Keyboard Shortcuts

Action	Shortcut
Print	Cmd P
Toggle View Mode	Cmd E
Bold	Cmd B
Italic	Cmd I
Link	Cmd K
Save	Cmd S
New File	Cmd N
Reload	Cmd R
Zoom In	Cmd +
Zoom Out	Cmd -
Actual Size	Cmd 0
System Appearance	Cmd Shift 0
Light Mode	Cmd Shift 1
Dark Mode	Cmd Shift 2

Dependencies

Library	Version	License	Purpose
marked	15.0.7	MIT	Markdown → HTML parsing

No Swift package dependencies. No external frameworks.

License

MIT