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The original was posted on /r/opensource by /u/jithu3 on 2025-06-09 12:15:15+00:00.
Hey Reddit,
My external monitor is partially broken, and I only wanted to use one side of it. Windows doesn’t offer a solution, and other tools felt clunky. So, I wrote my own lightweight utility called Display Partitioner to create an invisible “hard wall” for my mouse.
After sharing the first version, I’ve just released a major update that turns it from a simple script into a full-featured application.
It runs silently in your system tray and lets you:
Visually Partition Any Monitor: Use a simple drag-and-drop GUI to decide exactly which part of your screen is usable.
Create a Lag-Free “Hard Wall”: It uses native Windows APIs, so there’s zero mouse lag or stutter.
Set a Custom Hotkey: Toggle the partition on and off instantly without opening a window.
Save Your Layout: It remembers all your settings, so it’s a true “set it and forget it” tool.
It’s completely free and open-source. If you have a monitor that’s too big, partially damaged, or just want more control over your workspace, this might be for you.
Check it out on GitHub and let me know what you think!