The WBMP file type is primarily associated with Wireless Bitmap File Format. WBMP is a WAP graphic format optimized for mobile computing devices. The pictures in the WBMP format are saved in bit format. That is every pixel of an image is saved as 1 bit. Thus a 8 x 8 pixel image will require only 64 bits (8 bytes). The limitation of this format is that it can only save images in Black and White only (no support for color or gray scale).