Convert bb4 to bmp Online: bb42bmp
You can use Tom's Editor to easily convert images from
Mode 4 .BB4 to Microsoft Windows bitmap .BMP.
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.
Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.