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Editorial Team
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Asked: 2026-05-19T02:40:55+00:00

I am creating a custom NSWindow with no title bar and am using NSBorderlessWindowMask

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I am creating a custom NSWindow with no title bar and am using NSBorderlessWindowMask to make it completely borderless. The problem I have with this however is that the window has sharp edges. As well as this there is no resize control.

How would I give a borderless window rounded corners?

This is not a duplicate of this
question as that question was more
about removing the title bar and it
currently holds no answers.

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1 Answer

  1. Editorial Team

    You can make the window totally transparent and handle drawing everything yourself. The sample I have is for an OpenGL view, but it should work for a Quartz view or Cocoa view as well.

    Add the following to the initializer of your NSWindow subclass where you create the new window using the NSBorderlessWindowMask constant.

    [self setOpaque:NO];
[self setBackgroundColor:[NSColor clearColor]];

    You will probably have to draw the resize control yourself. The sample I took this from is a full screen window so resizing isn’t necessary.

    Good Luck.

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