If you explore your storage with a file manager, you may find multi-gigabyte files under Android/obb and wonder whether they are safe to remove.

Short answer: no, OBB files are game data. Deleting them breaks the associated game and forces a multi-gigabyte redownload. The safe path is to uninstall the game itself through Settings.

APK vs OBB

Two file types power most Android apps:

  • APK: the installer and core code, usually 10-100 MB
  • OBB: the large expansion file that holds textures, audio, 3D assets, and map data for heavy games

Large mobile games like PUBG, Genshin Impact, and Call of Duty Mobile ship a small APK from the Play Store and then download a 1-5 GB OBB file on first launch so the game has real content.

What happens if you delete an OBB

If you delete an OBB for a game you actively play:

  1. the game still shows up on your home screen because the APK is still installed
  2. launching the game triggers an error or a "Downloading resources" screen
  3. Android redownloads the multi-gigabyte expansion over Wi-Fi before you can play

So the short-term storage win is immediately undone the next time you open the game.

When orphaned OBBs exist

Occasionally an OBB is left behind after a bad uninstall. If the matching game is truly gone from Settings > Apps, removing the orphaned OBB is safe. Normal uninstalls clean up the OBB on their own.

The safer cleanup path

If a game is taking too much space, uninstall it through Settings > Apps. Android removes both the APK and the OBB together, and the space returns cleanly.

Better next routes

If you want a broader decision framework for what is safe to delete, use the Storage Cleanup FAQ.

If hidden app data elsewhere is the real problem, continue with How to Delete Hidden Thumbnails on Android.