Hello,

> not completely sure what the exact requirements are (like corner radius)

You need to use the Icon Composer app, from Apple, it will help you. 

https://developer.apple.com/icon-composer/

Some help here : 
https://developer.apple.com/documentation/xcode/creating-your-app-icon-using-icon-composer/

I hope this can help.

But, yes, the current icon is very beautiful with its shiny pen.

> But changing the icons is a lot of work, especially as it should also work in 
> older systems (Apple has now made it very hard if not impossible to be fully 
> cross-compatible)

Yes, according to the last update (2025-11-12) at 
https://mjtsai.com/blog/2025/08/08/separate-icons-for-macos-tahoe-vs-earlier/

I have no longer a Mac under the previous system so I cannot compare.

> And right now, I don’t have the time to replace all the app and document 
> icons (they come together).

Perhaps you could keep the document icons (eg 
/Applications/TeX/BibDesk.app/Contents/Resources/risDocIcon.icns) and for the 
app icon, use a yellow background and add the pen and the guillemets over it 
with Icon Composer app…

By the way, why is the main app icon 
(/Applications/TeX/BibDesk.app/Contents/Resources/BibDesk.icns) only 94 kB 
(great), 
but the /Applications/TeX/BibDesk.app/Contents/Resources/cacheDocIcon.icns 1.3 
MB size (!!!), 
the /Applications/TeX/BibDesk.app/Contents/Resources/bibDocIcon.icns 648 kB 
size (!!!), 
the /Applications/TeX/BibDesk.app/Contents/Resources/risDocIcon.icns 657 kB 
size (!!!) 
and the /Applications/TeX/BibDesk.app/Contents/Resources/searchDocIcon.icns 439 
kB size (!!!)?

Also 3.4 MB for /Applications/TeX/BibDesk.app/Contents/Resources/Assets.car 
seems a little big. Is this very necessary? Isn’t, for example, the file 
icon_512x512_Normal@2x_1.png (yellow textured square) a working file (for 
creating icons, like [email protected]?) and not a file really used by 
the app?

These files can probably be smaller.

Perhaps this can be in mind when you will have the time for modernize the icons?

Thanks.
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