MarkerOn

MarkerOn — Lightweight Screen Annotation Tool

Press a shortcut key to immediately draw, highlight, and annotate over any application. Ideal for scenarios like classroom presentations, meeting explanations, and screen recording annotations.

Download & Installation

• Windows x64: Download from GitHub Releases
• macOS ARM64 / x64: Download from GitHub Releases
• Microsoft Store: Install directly

Key Features

• Annotate Anywhere — Draw over any open application, covering the full screen including the taskbar
• 8 Built-in Tools — Pen, highlighter, arrow, rectangle, ellipse, straight line, eraser, text tool
• Intuitive Control Panel — Call it up with the Space key to adjust tools, colors, and line width all in one place
• Full Keyboard Control — Every operation has a dedicated shortcut, no need to navigate through menus
• Persistent Annotations — Your drawings are preserved after exiting the tool, and automatically restored the next time you launch it

Shortcuts

Function	Windows	macOS
Toggle annotation mode	Ctrl+Shift+D	Command+Shift+D
Clear all annotations	Ctrl+Shift+C	Command+Shift+C
Open settings panel	Space	Space
Copy screen	Ctrl+C	Command+C
Undo / Redo	Ctrl+Z / Y	Command+Z / Y
Adjust line width	Ctrl+Scroll Wheel	Command+Scroll Wheel

Tool shortcuts: 1 - Pen, 2 - Highlighter, 3 - Arrow, 4 - Rectangle, 5 - Ellipse, 6 - Straight Line, 7 - Eraser, T - Text

Tech Stack

Technology	Purpose
Tauri v2	Desktop app framework — Rust backend, system tray integration, global shortcut support, transparent topmost windows
Vue 3	UI framework for the rendering layer
TypeScript	Full type support
Canvas API	High-performance drawing engine

Open Source & Free

This project is licensed under the MIT License, with its entire source code publicly available.

GitHub: https://github.com/ifer47/markeron