How to Safely Bypass Windows 11 ‘Rounded Corners’ (Force Square Windows)

One of the most defining visual features of Windows 11 is its aggressive use of rounded corners. Every single application window, right-click menu, and pop-up dialog box features soft, curved edges. While Microsoft considers this a modern, elegant design, many traditional power users despise it. The curves can look out of place on a sharp, professional monitor, and they occasionally clip the very edges of legacy software interfaces.

Unfortunately, Microsoft did not include a toggle switch in the Settings app to turn this off. However, the Windows Desktop Window Manager (DWM) can be tricked into reverting to the classic, sharp, square corners of Windows 10 by running a specialized, open-source bypass utility.

How to Safely Bypass Windows 11 Rounded Corners

You must use a lightweight, open-source tool called “Win11DisableRoundedCorners” to patch the rendering engine in memory.

1. Open your web browser and search for Win11DisableRoundedCorners GitHub (it is maintained by the developer ‘valinet’).
2. Navigate to the official GitHub Releases page and download the small .exe file.
3. Because this tool actively modifies how the operating system draws graphics on the screen, your web browser or Windows Defender might flag it as suspicious. This is a false positive caused by how the tool interacts with the DWM; it is entirely safe and open-source. (Allow the file if prompted).
4. Right-click the downloaded .exe file and select Run as administrator.
5. A black command prompt window will appear briefly. Your screen will likely flicker black for a second, and your taskbar will disappear and reappear. This is the Desktop Window Manager restarting.

Look at the window you currently have open. The soft, rounded curves are completely gone, replaced instantly by sharp, 90-degree right angles. The tool installs itself as a lightweight background service, ensuring that your windows remain perfectly square even after you restart your computer.