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Is there a system API, or utility (open source), or default I can set to disable all 4 rounded window corners on macOS?

I've checked the two other prominent questions relating to this:

  1. Can I change 10.8.2 Mountain Lion window corners from rounded to squared?
  2. How can I disable rounded window corners in OS X

And the links are either dead, or the offered solution does not work.

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    I don't know for absolute certain, so can't provide an actual answer, but basically DIY custom theming hasn't been possible on Mac in the past decade. – Tetsujin Sep 24 '19 at 11:28
  • I know that the radius is possible for NSWindowStyle or something to that effect, it seems a bit heavy if it is impossible to not change the window radius to 0 though :( – Jordan Sep 25 '19 at 6:07
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I figured it out, I used ThemeEngine to edit the appropriate theme in SystemAppearance.bundle.

I made a repo with the changes here: https://github.com/tsujp/custom-macos-gui

I know StackExchange hate linking answers so here is a summary for my case:

  1. Using ThemeEngine edit the files in DarkAquaAppearance.car
  2. The files you need to edit are WindowFrame_WindowShapeEdges
  3. Change the masks to squares.
  4. Change the base to completely transparent.
  5. Reboot or otherwise restart the Dock, Finder, SystemUIServer, etc.

img

| improve this answer | |
  • Care to add a screenshot? I'm curious how this looks. – Dillon Oct 11 '19 at 15:49
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    @Dillon I added the screenshot in my repo to my self-answer, give it a check – Jordan Oct 11 '19 at 16:18

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