Convert jpg to ithmb Online: jpg2ithmb
You can use Tom's Editor to easily convert images from
Joint Photographic Experts Group JFIF .JPG to iPod Thumbnail
Tom's Editor is a free, online image manipulation and converter program.
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Joint Photographic Experts Group JFIF is an image format with extension JPG.
ITHMB are thumbnails used by various Apple devices. At first these images were used by iPhods but now can be found on iPhones and iPads.