ICO maximum size

Question

Is there a way to convert an image to ICO format, if the resolution is bigger than 256x256?

I found several programs but none of them was able to convert larger images. The size which I need is 1024x1024.

Answer 1

Since the width and height is stored as a single byte each in the ICO image format, it cannot represent images larger than 256×256.

You need to first resize your image.

http://en.wikipedia.org/wiki/ICO_(file_format)#Outline