What Is "System" and "Other" Storage on Android – and How to Reduce It

In Settings → Storage, Android splits the used space into groups such as Apps, Images, Videos, Audio, Documents, System and Other (on some phones "Miscellaneous" or "Files").

System

This is Android itself and space reserved for updates. It cannot be reduced without risking your phone. A system update can make it grow for a short time.

Other / Miscellaneous

This is everything Android does not sort into a group, for example:

• App caches and app data
• Downloads, archives and old APK installers
• Files left behind by apps you uninstalled
• Hidden folders and chat media copies

How to reduce "Other"

1. Run the APPtoSD junk cleaner: it finds leftovers, old installers, temporary files and empty folders, and shows them before removing anything.
2. Use Storage analysis in APPtoSD to see the largest files and duplicates.
3. Move large downloads, videos and documents to the SD card.