How do I free up space on my Android without deleting everything?

Clear the cache

To clear cached data from a single or specific program, just go to Settings> Applications>Application Manager and tap on the app, of which the cached data you want to remove. In the information menu, tap on Storage and then “Clear Cache” to remove the relative cached files.

Why is my internal storage always full Android?

Android phones and tablets can fill up quickly as you download apps, add media files like music and movies, and cache data for use offline. Many lower-end devices may only include a few gigabytes of storage, making this even more of a problem.