Convert flif to ithmb Online: flif2ithmb
You can use Tom's Editor to easily convert images from
Free Lossless Image Format .FLIF to iPod Thumbnail
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Free Lossless Image Format is an image format with extension FLIF.
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.