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TinyMark

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

macOS Swift

TinyMark screenshot

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