When your phone says storage is full, the quickest wins are usually a few big things, not thousands of small ones. This is the safe order: look first, back up what matters, then remove what you no longer need. Menu names vary a little between phone makers.
Open Settings → Storage (on some phones under Battery and device care or Device care). Android shows used and available storage, usually broken down into categories such as apps, images, videos and other files; the exact categories vary by device. Start with the biggest category instead of cleaning at random.
Photos and videos are usually the largest and the most personal files. Before deleting any, make sure they are backed up - for example with your cloud photo service or by copying them to a computer - and check that the backup really contains them.
Open Settings → Apps and review the installed apps; some phones let you sort by size or usage, and Files by Google can help spot unused apps. An unused game can take several gigabytes. Uninstalling an app usually removes its local data from the device, while cloud or account data may remain available after you reinstall, depending on the app - check before uninstalling.
Settings → Apps → the app → Storage lets you clear cache. A cache is temporary data that the app rebuilds, so apps may start a little slower once. Do not choose Clear storage / Clear data unless you intend to reset the app: it permanently deletes the app's stored data on the device (for example offline downloads or unsynced progress).
Open your phone's file manager, or Files by Google if it is installed, and review Downloads and large files. Installers, old PDFs and forwarded videos pile up there. Delete only what you recognise, and keep anything you cannot easily download again.
Music, video and map apps keep offline downloads that can be several gigabytes. Remove offline downloads you no longer need, but first confirm they can be downloaded again later if you want them back.
Duplicate photos, old screenshots and forwarded memes add up. Review them before deleting - two photos that look the same may be different shots - and delete through the gallery or Files app so you can use the trash/recently deleted folder as a safety net.
Freeing space helps when the phone is nearly full, but it does not make a slow phone dramatically faster. No cleaner should promise that, and none should delete files without asking.
Rain Cleaner for Android helps you see where the space went (apps, duplicates, old screenshots, big videos) and asks for your confirmation through Android's own dialog before anything is removed. It has no ads; the Free version covers the cleanup tools and Pro adds scheduled maintenance, storage and battery trends and a full report. You can do everything above with Android alone - the app just puts the checks in one place.
Last updated: 2026-10-01
Generally yes - it is temporary data - but apps may open a little slower once. Avoid Clear storage / Clear data unless you want to reset the app.
Often, since photos and videos are usually the largest files, but back them up first and check the backup.
No. Android's Storage settings and the Files app cover the basics; a cleaner mainly saves time and shows duplicates and large files in one list.
Built-in tools first, and what to check before you delete.
A practical order to check before you change anything.
A short, ordered checklist before you change anything.
Read the ID, understand it and search the maker's official page.
What each cleaner is built for, and who it fits.
What is safe to remove, and what needs a second look.
Why they appear and how to remove them without losing a good shot.
Rain Cleaner: review before cleanup, free version, 14-day Pro trial.
Hash check, Defender scan and the SmartScreen steps.
How to report a security issue privately.
What we are working on now, next and later.
Free, no account, no subscription. Windows 10 and 11.