TinyMark

A native macOS Markdown editor. Write on the left, see it rendered on the right, browse your folder on the side.

Features

• Three-panel layout — file sidebar, editor, and live preview
• Syntax highlighting — headings, bold, italic, code, links, images
• Live preview — GitHub-styled HTML with synced scrolling
• Directory browsing — navigate folders, subdirectories, and files
• Quick open — fuzzy file finder (Cmd+P)
• Auto-save — saves as you type with dirty-file indicators
• Find & replace — native macOS find bar (Cmd+F)
• Markdown shortcuts — bold (Cmd+B), italic (Cmd+I), link (Cmd+K), code (Cmd+Shift+K)
• Image drag & drop — drop images into the editor to insert relative markdown paths
• Line numbers — optional gutter with current line highlight
• Smart pairs — auto-close *, `, [, (, "
• Tab indentation — indent/outdent list items with Tab/Shift+Tab
• Frontmatter display — YAML frontmatter rendered as a table in preview
• Multiple windows — each window has independent state
• Font size control — Cmd+/Cmd- to adjust, Cmd+0 to reset
• Light & dark mode — follows system appearance
• Status bar — line count, word count, character count, reading time
• On-device AI — Cmd+K to ask questions about your document (CoreML, fully offline)
• Open from Finder — double-click .md or .txt files to open in TinyMark

Requirements

• macOS 26.0+
• Xcode 26+ (to build)

Build

xcodegen generate --spec project.yml

xcodebuild clean build \
  -project TinyMark.xcodeproj \
  -scheme TinyMark \
  -configuration Release \
  -derivedDataPath /tmp/tinybuild/tinymark \
  CODE_SIGN_IDENTITY="-"

rm -rf /Applications/TinyMark.app
cp -R /tmp/tinybuild/tinymark/Build/Products/Release/TinyMark.app /Applications/
xattr -cr /Applications/TinyMark.app

Keyboard Shortcuts

Shortcut	Action
Cmd+N	New file
Cmd+Shift+N	New window
Cmd+O	Open folder
Cmd+S	Save
Cmd+Shift+S	Save as
Cmd+P	Quick open
Cmd+F	Find
Cmd+G	Find next
Cmd+Shift+G	Find previous
Cmd+B	Bold
Cmd+I	Italic
Cmd+K	AI assistant
Cmd+Shift+K	Inline code
Opt+↑ / Opt+↓	Move line up/down
Cmd+Shift+D	Duplicate line
Cmd+L	Select line
Cmd+Enter	Insert line below
Cmd+Shift+Enter	Insert line above
Cmd+/	Toggle comment
Cmd+= / Cmd+-	Font size
Cmd+0	Reset font size
Opt+Z	Toggle word wrap
Opt+P	Toggle preview
Opt+L	Toggle line numbers
Tab / Shift+Tab	Indent/outdent list
Enter	Auto-indent with list continuation

Tech

Built with SwiftUI, NSTextView, WKWebView, and swift-markdown.

Part of TinySuite

Native macOS micro-tools that each do one thing well.

App	What it does
TinyMark	Markdown editor with live preview
TinyTask	Plain-text task manager
TinyJSON	JSON viewer with collapsible tree
TinyCSV	Lightweight CSV/TSV table viewer
TinyPDF	PDF text extractor with OCR
TinyLog	Log viewer with level filtering
TinySQL	Native PostgreSQL browser

License

MIT