Convert cis to pnm Online: cis2pnm

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

Go to Tom's Editor

CIS

Compuserve RLE image is an image format with extension CIS.

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.