Convert cmuwm to pnm Online: cmuwm2pnm

You can use Tom's Editor to easily convert images from
CMU window manager bitmap .CMUWM to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

CMUWM

CMU window manager bitmap is an image format with extension CMUWM.

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.