Binary encoding of Adobe's character bitmap distribution formation, which is an ASCII text-encoded font format; each ABF file consists of a sequence of 8-bit bytes; character bitmaps are stored in a "strike" format, which is a rectangular pixel array; the height of the rectangle is the height of the tallest character in the font and the width is the sum of all the character widths.

The ABF format is also known as the "Adobe Glyph Bitmap Distribution Format."