Convert gcd to pnm Online: gcd2pnm

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

Go to Tom's Editor

GCD

Gigacad is an image format with extension GCD.

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.