Convert bmp to bb4 Online: bmp2bb4
You can use Tom's Editor to easily convert images from
Microsoft Windows bitmap .BMP to Mode 4 .BB4.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.
Mode 4 is an image format with extension BB4.