Convert 4bt to pnm Online: 4bt2pnm
You can use Tom's Editor to easily convert images from
GoDot .4BT to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
GoDot is an image format with extension 4BT.
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.