Rounded corners on inner window area

Hey yall,

I’ve been tweaking my theme, figured out how to mess about with the window decoration configs/svg.

My goal here is to achieve a similar rounded corner effect for what I can only describe as the “inner content area” of windows. Couple images to demonstrate (arrows point to what I want to attempt to make rounded):

image
image

Thanks

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I was just preparing to write something about this case and this topic came up, so I’m continuing it here.

I am also interested in this feature if it can be done in the future.

Demonstrating it in mpv player.

Four window corners have border rounded, but square inside.

Screenshot_20250528_095954

Screenshot_20250528_100033

Screenshot_20250528_100051

Screenshot_20250528_100111

Window Decoration Edits

Hello,

To have rounder rounder corners, I use a third party KWin effect : GitHub - matinlotfali/KDE-Rounded-Corners: Rounds the corners of your windows in KDE Plasma 5 and 6

And after some tweaking around, you should get something decent.
This is how i configured it btw :

The only downside is that it is not available from the KDE Store so you have to manually install it using the tutorial on the github page.

Keep in mind that it is a third party tool so no guaranties for his survival from KWin updates. But it’s still a greate (and the only one i know) tool if you want rounded widows corners.

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@the-entropyst Thank you for writing and suggesting. I am aware of KDE-Rounded-Corners but i’ve been hesitant to install 3rd parts. I’ve been loyal and stick to Breeze for a while.