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This tool simply creates a valid ICO header and "glues" together the PNG files provided. Any other types of images will be rejected.
icopack is the most efficient way to create Favicons.
The ICO file format allows either uncompressed or PNG compressed images. The PNG images are stored as-is inside the file and accessed through a simple file header plus frame index. The PNG files can be palette or full color, but must be no larger than 256x256.
$ icopack output.ico icon-1.png icon-2.png icon-N.png
This software is distributed under the GNU General Public License, Version 3. See the LICENSE file for more information.