Ithmb files are photo thumbnails generated by the iPhone, iPad and iPod Touch on PC. With Ithmb Viewer, you can directly open and view them on your Windows device. Ithmb Viewer can also open common image formats and raw images. Features: - Open Ithmb Files - Browse the images one by one in an Ithmb file - Convert Ithmb to JPG FAQ 1, why is my photo in the .ithmb file so small and blurry that I cannot do anything with it? Answer: normally an .ithmb file contains multiple thumbnail images with different sizes. You can use Up and Down arrow in the toolbar to go through them and find the large one to work with.