Convert spu to flif Online: spu2flif

You can use Tom's Editor to easily convert images from
Spectrum 512 .SPU to Free Lossless Image Format .FLIF.
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.

FLIF

Free Lossless Image Format is an image format with extension FLIF.