Convert jj to pnm Online: jj2pnm

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

Go to Tom's Editor

JJ

Doodle, packed is an image format with extension JJ.

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.