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.OBB File Extension

File TypeAndroid Opaque Binary Blob File

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CategoryData Files

What is an OBB file?

File used by some Android apps sold on the Google Play online store; contains additional app data that is not stored in the main application package (.APK file), such as graphics, media files, or other large program assets; uses an encrypted format.

More Information

Since Google Play only allows APK files to be 50MB or smaller in file size, app developers must use different files to store additional app assets. Developers can use any format they choose, such as .ZIP or .MP4, but they can also use the JOBB tool provided with the Android SDK to bundle and encrypt assets together in an OBB file. These additional assets can be uploaded with the APK file using the Google Play Developer Console, and users that download the app will receive both the APK file and the additional asset files.

NOTE: Any additional asset provided beyond the APK file is called an APK Expansion File.

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Programs that open OBB files
Updated 3/4/2013

About OBB Files

Our goal is to help you understand what a file with a *.obb suffix is and how to open it.

The Android Opaque Binary Blob file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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