Elephicon is a "Droplet" to Generate ICNS and ICO files for your desktop apps - for Windows 10 or Mac OS X systems.
(A "Droplet" is a stand alone APP that you drag-and-drop {the File to be processed} onto ... the operation mode of the APP is per-determined. So called because you just DROP the source file onto the APP and then collect the results ... a 'One-trick-Pony' that wakes up and does its 'one trick' to whatever file you slap down in its Saddle ... before going back to sleep. An attempt to make a "No Brainer" of an APP that does one thing well.)Software Santa uses it / likes it / requested a new feature from the Developer.Elephicon
Elephicon (is a GUI Wrapper for png2icons library) generates Apple ICNS and Microsoft ICO files from PNG files.
Usage
The ideal input is a 24 bit PNG with an alpha channel (RGBA) with 1024×1024 pixels but any other dimensions and most other PNG formats do also work.
If you only need to create ICO files 256×256 pixels are sufficient.
You can also configure the settings by right-click context menu.
First select the button for either .ICO or .ICNS output format ... then drag and drop your .PNG file (Or Right Click and choose it with "Open") ... your result is on your Desktop!
[A "Two Trick Pony" of Sorts - a kind of "Pushmi-Pullyu" with Two Heads and no butt - does files made for Windows, or Mac X - on either Mac X, OR Windows Systems ... Walks Forward in Either direction.]
Embedded Sizes
Dimension ICO ICNS
16x16 ✅ ✅
16x16@2x ✅
24x24 ✅
32x32 ✅ ✅
32x32@2x ✅
48x48 ✅
64x64 ✅
72x72 ✅
96x96 ✅
128x128 ✅ ✅
128x128@2x ✅
256x256 ✅ ✅
256x256@2x ✅
512x512 ✅
512x512@2x ✅
https://sprout2000.github.io/elephicon/
https://github.com/sprout2000/elephicon/releases/latest