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.OBB File Extension

File TypeAndroid Opaque Binary Blob File

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CategoryData Files

What is an OBB file?

An OBB file is an expansion file used by some Android apps distributed using the Google Play online store. It contains data that is not stored in the application's main package (.APK file), such as graphics, media files, and other large program assets. OBB files are often stored in a device's shared storage folder.

More Information

Since Google Play allows APK files to be only 100MB or smaller in file size, app developers must use expansion files to store additional app assets. Developers can create expansion files using 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 within an OBB file.

Developers then upload these expansion files alongside their application's APK file using the Google Play Developer Console. Users who download the app receive both the app's APK file and its expansion files.

NOTE: Any additional asset provided beyond an app's APK file is called an APK Expansion File. Developers can include up to two APK Expansion Files within their Android apps.

How do I open an OBB file?

Typically, users should not open OBB files. OBB files store data using an encrypted format.

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Programs that open OBB files

Updated 6/17/2020

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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