Enable Rounded Windows Corner for KUbuntu KDE Plasma Desktop

Want to round corners of windows in KDE Plasma Desktop? Here’s a KWin effect can do the job in recent Plasma desktop from v5.27 to v6.3.

There was a ShapeCorners KWin/5 effect can do the job to enable rounded window corners, which however discontinued. What I’m going to introduce is KDE-Rounded-Corners, a fork of ShapeCorners with optimization and recent Plasma desktop support.

Dolphin file manager with rounded corners

As mentioned, it’s a kwin effect that rounds corners of windows by using OpenGL shaders with influences from the built-in invert effect.

Instead of the default sharp corners, the effect will make all the 4 corners of windows rounded. While, users also have the choices to:

change roundness radius.
configure outline color, thickness.
Include/Exclude app windows for the rounded corners effect.

rounded corners configuration dialog

This KWin effect so far supports Plasma version 5.27 to 6.3+ on both Wayland and Xorg. And, it’s been tested on the following Linux Distributions:

KUbuntu 24.04, KUbuntu 24.10, KUbuntu 25.04.
KUbuntu 22.04 with Plasma 5.27 (from backports PPA).
Debian 12, Debian Sid (unstable).
Fedora 42.
openSUSE Tumbleweed.
Arch Linux.
KDE Neon (stable and unstable).

Install KDE-Rounded-Corners

The project offers official packages for Debian, KUbuntu, KDE Neon, and openSUSE tumbleweed which are available to download at the link below:

Download KDE-Rounded-Corners

So far the packages are hosted under “nightly” sub-directory.

For choice, there are also a copr repository for Fedora, and an AUR repository for Arch that maintain the most recent packages.

For KUbuntu users, select download the .deb package depends on your system edition, then click open with “QApt Package Installer”, and finally install.

After installed the package, log out and back in to apply the rounded corners effect.

And, open System Settings, navigate to Workspace Behavior -> Desktop Effects, find out and click edit Rounded Corners (formerly ShapeCorners) to configure the roundness radius, outline, etc.