Convert spu to pnm Online: spu2pnm

You can use Tom's Editor to easily convert images from
Spectrum 512 .SPU to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

SPU

Spectrum 512 is an image format with extension SPU.

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.