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Open-Source Lightweight Screen Annotation Tool: 1.4MB Turns Your Screen Into a Free Canvas! 8 Annotation Tools + Full Keyboard Control — MarkerOn

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🕒Last updated: 07/01/2026
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Description

open source lightweight screen annotation tool 1.4mb full canvas 8 tools keyboard markeron MarkerOn is an ultra-lightweight open-source screen annotation tool: press a hotkey to freely draw on any software interface, the desktop or even the taskbar. The installer is only about 1.5MB, built on Rust and Canvas, with extremely low resource use. It supports 8 annotation tools and full keyboard control, is completely free, and runs on Windows and macOS.

Features

The installer is only ~1.5MB, memory use is tiny, there's no background process, and response is instant.

It offers 8 tools: pen, highlighter, arrow, rectangle, ellipse, line, eraser and text.

Fully keyboard-controlled: press number keys 1-7 or T to instantly switch tools without opening menus.

It supports whiteboard mode: press W to one-click switch to a clean whiteboard workspace, handy for meeting demos.

Annotations are kept in memory; reopening after exit lets you continue editing — ideal for step-by-step explanation.

It offers modifier-key drawing: hold Ctrl/Command and drag for a rectangle, Shift-drag for an ellipse, doubling efficiency.

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open source lightweight screen annotation tool 1.4mb full canvas 8 tools keyboard markeron

Supporting Study Materials

This course comes with a materials pack. Members receive the access link by email after requesting the course.

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