With this free tool, you can create an icon from image (.png, .jpg, .gif, .bmp)

Image to convert

Sizes and color formats

32-bits	16x16	24x24	32x32	48x48	128x128	256x256
256-colors	16x16	24x24	32x32	48x48

Crop and proportion

No crop, keep proportion	No crop, stretch image	Top / left	Center	Bottom / right

Effects

Sharpen	Grayscale	Invert