Convert hdiff to bmp Online: hdiff2bmp

You can use Tom's Editor to easily convert images from
Horizontal difference image .HDIFF to Microsoft Windows bitmap .BMP.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

HDIFF

Horizontal difference image is an image format with extension HDIFF.

BMP

Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.