Convert ico to pnm Online: ico2pnm

You can use Tom's Editor to easily convert images from
Microsoft icon .ICO to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

ICO

Microsoft icon is an image format with extension ICO.

PNM

PNM images are uncompressed 24 bit RGB images. Can cannot store Alpha channel. PNM images come in 2 types: binary and text. Especially popular on Linux.