How to Free Up Storage on Android and iPhone
See what’s filling your phone, clear space safely with built-in tools, and avoid deleting anything you’ll miss later.
A “Storage full” warning usually arrives at the worst moment: you’re trying to take a photo, install an update, or save a file someone just sent you. The good news is that both Android and iPhone include tools that show exactly what is using your space and help you clear it safely. This guide walks through those built-in tools, explains what is safe to delete, and points out the few things to double-check before you remove anything.
Before you start: back up anything you can’t replace
Most storage clean-ups involve photos, videos and downloads. Before deleting any of them, make sure the ones you care about are backed up somewhere else, such as a cloud photo service or a computer. A photo that only exists on your phone is gone for good once it leaves the trash folder.
Step 1: See what is using your space
On Android
Open Settings and search for “Storage”. Most phones show a bar or list split into categories such as apps, images, videos, audio, documents and system. Tap a category to see what is inside. Menu names differ by brand: on some Samsung phones, storage sits under “Battery and device care” or “Device care”, and many phones also show a “Free up space” or “Clean up” button that opens suggestions.
On iPhone
Open Settings, tap General, then iPhone Storage. After a short wait, you’ll see a colored bar showing which kinds of data take up space, a list of recommendations, and your apps sorted by size. Tapping an app shows how much space the app itself uses and how much is taken by its documents and data.
Quick wins that work on any phone
Clear out your downloads
Open your file manager and look in the Downloads folder. On iPhone that’s the Files app; on Android it’s usually Google’s Files app or your brand’s own file manager. Old PDFs, installers and forwarded videos pile up here and are rarely needed again.
Remove offline downloads in streaming apps
Music, video and podcast apps can store large offline files. Open each app’s downloads or library section and remove episodes, songs or films you’ve already finished.
Tidy up messaging apps
Chat apps save the photos, videos and voice notes you receive. WhatsApp, for example, has a storage manager under Settings, then Storage and data, then Manage storage, which lists the largest files and chats. Other messaging apps often have a similar option in their settings.
Review videos, screenshots and duplicates
Videos use far more space than photos, so review long videos first, then old screenshots and near-identical shots. On iPhone, the Photos app can show a Duplicates album; on Android, Google’s Files app can suggest duplicate files.
Empty the trash when you’re sure
Deleted photos usually move to a “Recently Deleted” album on iPhone, or a “Trash” or “Bin” folder in Android gallery apps and Google Photos. They only free space once that folder is emptied or the holding period ends. Check its contents first, because emptying it can’t be undone.
Android: built-in ways to free up space
- Google’s Files app: Many Android phones include it. Its Clean section suggests junk files, duplicates, large files and photos that are already backed up, and asks you to confirm before deleting anything.
- Clear an app’s cache: Open Settings, go to Apps, pick an app, then tap Storage (or Storage and cache) and choose “Clear cache”. This removes temporary files the app can rebuild. Avoid “Clear storage” or “Clear data” unless you mean it, because that resets the app, including sign-ins and offline downloads.
- Archive or uninstall apps you don’t use: On newer Android versions you can archive an app from its app info page. This removes the app but keeps your data and its icon, and the app reinstalls when you tap it. The Play Store also offers an “Automatically archive apps” option in its General settings.
- Free up space in Google Photos: If you use Google Photos backup, tap your profile picture in the app and choose “Free up space”. It removes the phone’s copies of photos and videos that are already backed up; they stay in your Google Photos library.
- Use a memory card if your phone has a slot: Some phones can save photos, videos and music to a microSD card. Look in the camera settings for a storage location option.
iPhone: built-in ways to free up space
- Follow the recommendations: Under Settings, General, iPhone Storage, iOS may suggest steps such as offloading unused apps or reviewing large attachments, along with how much space each would free.
- Offload apps you rarely use: Tap an app in the iPhone Storage list and choose “Offload App”. This removes the app but keeps its documents and data. Reinstalling it from the App Store brings everything back, as long as the app is still available there.
- Shorten your message history: In Settings, find Messages and look for “Keep Messages”. Changing it from Forever to 1 Year or 30 Days automatically deletes older conversations and their attachments. Those messages are deleted permanently, so only change this if you don’t need old texts.
- Optimize photo storage with iCloud: If you use iCloud Photos, turning on “Optimize iPhone Storage” keeps full-resolution originals in iCloud and smaller versions on the phone. Search Settings for “iCloud Photos” to find it. This needs enough iCloud storage for your whole library.
What about “System” or “System Data”?
Both platforms reserve space for the operating system. On Android, this is the system software itself and can’t be cleared. On iPhone, “System Data” includes caches, logs and other temporary files that iOS manages on its own, so its size rises and falls over time. There is no safe way to wipe it manually, and apps that claim to clear it can’t reach it.
Why built-in tools beat “cleaner” apps
App stores are full of cleaner and booster apps that promise to free up space with one tap. Built-in tools are the safer choice. They show you exactly what will be deleted and ask before removing it. They don’t need broad access to your files, contacts or notifications. And they don’t inflate their results by deleting cache files that apps simply rebuild the next time you open them. Many cleaner apps also show heavy advertising, which uses data and battery of its own.
Is it safe to clear an app’s cache?
Yes. The cache holds temporary files the app can download or rebuild. The app may be a little slower the next time you open it while it rebuilds them. “Clear storage” or “Clear data” is different: it resets the app completely.
Will deleting photos from my phone delete them from the cloud?
Often, yes. If you use iCloud Photos, deleting a photo on your iPhone also deletes it from iCloud and your other devices. In Google Photos, deleting a backed-up photo removes it from your account as well as the phone. If you only want to remove the phone’s copies, use Google Photos’ “Free up space” option instead.
What’s the difference between offloading and deleting an app on iPhone?
Deleting removes the app and its data. Offloading removes the app but keeps its documents and data on the phone, so everything is still there when you reinstall it.
How much free space should I keep?
There’s no single number that suits every phone, but running very close to full can cause failed updates, photos that won’t save and slower performance. Keep a comfortable margin free, and a bit more before a major system update.
Why does my storage fill up again so quickly?
Usually because of automatic downloads: chat apps saving every photo and video, streaming apps keeping offline content, or a camera recording long, high-resolution videos. Check the media auto-download settings in your chat apps and turn off automatic downloads for media you don’t need.