Convert bb4 to flif Online: bb42flif
You can use Tom's Editor to easily convert images from
Mode 4 .BB4 to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Mode 4 is an image format with extension BB4.
Free Lossless Image Format is an image format with extension FLIF.