Convert cm to pnm Online: cm2pnm

You can use Tom's Editor to easily convert images from
Puzzle image from X11 .CM to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

CM

Puzzle image from X11 is an image format with extension CM.

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.