Convert hdiff to jpg Online: hdiff2jpg

You can use Tom's Editor to easily convert images from
Horizontal difference image .HDIFF to Joint Photographic Experts Group JFIF .JPG.
Tom's Editor is a free, online image manipulation and converter program.

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HDIFF

Horizontal difference image is an image format with extension HDIFF.

JPG

Joint Photographic Experts Group JFIF is an image format with extension JPG.