winget install --id=rich-ayr.win11-toggle-rounded-corners -e A simple utility to disable rounded window corners on Windows 11
A simple utility to disable rounded window corners on Windows 11
An installer as well as the standalone binary for portable use can be downloaded here.
Windows 11 on x64 only. Some Anti-Virus/EDR products may block access to dwm.exe.
The program requires administrator privileges and asks for them itself, so you get the usual UAC prompt when you start it. There is no need to open an elevated terminal first.
win11-toggle-rounded-corners --disable # square corners
win11-toggle-rounded-corners --small # small rounding
Run it with no arguments to toggle.
The patch is applied to dwm.exe in memory and is lost whenever dwm.exe restarts (logoff, reboot, or a crash).
The installer re-applies it with a logon task, so it persists; the portable binary is one shot.
How to undo the patch depends on how you installed it:
--enable, or just reboot.If a leftover task is still squaring corners after uninstalling, you can remove it manually from an elevated Command Prompt:
schtasks /Delete /F /TN "Run win11-toggle-rounded-corners as admin on logon"
You need clang-cl or MSVC with C++23/26 support, plus meson and ninja.
First clone the repo
git clone 'https://github.com/rich-ayr/win11-toggle-rounded-corners.git'
Then simply build it with meson
meson setup build
meson compile -C build