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.