Convert hlr to pnm Online: hlr2pnm

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

Go to Tom's Editor

HLR

Attributes Gigascreen is an image format with extension HLR.

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.