Convert pnm to jp2 Online: pnm2jp2
You can use Tom's Editor to easily convert images from
Portable aNy Map .PNM to JPEG-2000 JP2 File Format Syntax .JP2.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
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.
JPEG-2000 JP2 File Format Syntax is an image format with extension JP2.