I want to be able to create an
.icofile containing a complete set of Windows icons (
16px x 16px,
32px x 32px,
48px x 48px, and
256px x 256px). Is there a web application that can do this for me given a PNG or BMP that is already
256px x 256px?
You could try with ConvertICO.
This is a batch png to icon converter which allows to create up to 20
multiple-size icons from images in png format at a time.
You can select as many output sizes as you need.
Another option is IcoConverter.
IcoConverter takes any image and converts it to an ICO pack.
The aspect ratio is not preserved, so squarish images are recommended.
Source : Link , Question Author : Casebash , Answer Author : Yisela