Simple tool that convert multiple .PNG files to one multisize .ICO file.
First of all, install Pillow by using this command:
pip install Pillow
Next, use this command to convert all your (or only one) .PNG file(s) to one .ICO file:
python png2ico.py 16.png 32.png ...
BTW, you don't actually need to have all of this .PNG files (16.png, 32.png, ...). With -r flag you can convert only one .PNG file to .ICO file with 7 different sizes (from 16x16 to 255x255):
python png2ico.py big-png-file.png -r
Also, you can specify output .ICO filename by using -o:
pyhon png2ico.py ... -o favicon.ico
If you're on Windows, you can just use drag&drop.cmd in the way shown in the gif below
