﻿ ITHMB File Extension - What is it and how to open ITHMB format

Opening ITHMB files

Have a problem opening a .ITHMB file? We collect information about file formats and can explain what ITHMB files are. Additionally we recommend software suitable for opening or converting such files.

What is the .ITHMB file type?

The .ithmb filename extension serves to distinguish the ITHMB ('iThumbnail') file format and the respective file type. ITHMB is a proprietary raster graphic image format developed by Apple, Inc. for its iOS-based mobile devices (iPod, iPhone and iPad).

An .ithmb file basically contains a series of thumbnails in several pixel dimensions to suit different preview modes and the device's screen size. ITHMB files are typically quite large, taking up a lot of storage, but they are faster and easier processed by the mobile CPU, which helps saving battery charge.


ITHMB thumbnails are created every time a device is synchronized with a computer via iTunes and are saved in both the device and the computer. On a device, all .ithmb files are stored inside the 'Thumbnails' or 'Thumbs' directory. On a computer, such files can be found inside the 'iDevice Photo Cache' folder.

ITHMB's can be considered and used as a backup of all images on an iDevice. In MacOS, images from .ithmb files can be retrieved via many third-party file tools. In Windows, there are several standalone commercial converter tools available for the same purpose.

Software to open or convert ITHMB files

You can open ITHMB files with the following programs:
iTunes by Apple Inc.
iThmb Converter
iThmb Converter by Dec Software
Photo Gallery
Photo Gallery by Microsoft Corporation

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