Also known as Opaque Binary Blob, the OBB file format was developed by Google for their Android system. This file format is used by Android app developers to package large files that are stored by their apps in the public SD card of the user's Android device. These .obb files can only be decrypted and used by the Android apps that generated them. This is because an OBB file contains a secret key that prevents other apps from accessing and using the content of the OBB file.Resources stored in OBB files are normally shared and used by different apps. For example, an OBB file with map data may be shared and used by Android apps that have been granted access rights to the map data in those .obb files.Android developers use Linux applications like Obbtool and MKOBB.SH to create .obb files. It's recommended to leave these OBB files alone, in order to ensure that the Android apps that need to use them can continue to work properly.
Try a universal file viewer
File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the OBB file format or software that uses files with the OBB suffix, please do get in touch - we would love hearing from you.