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“Storage almost full” tends to show up at the worst moment: you are about to film a birthday, or a system update refuses to download because it needs 6 GB and you have 1.8 GB left. The good news is that most phones are not full of mystery files. They are full of a few predictable things: videos, message attachments, WhatsApp media, apps you forgot about, and offline downloads from streaming apps.
This guide is about the storage inside the phone itself, the 128 GB or 256 GB you paid for. I’ll walk through the built-in tools on iPhone (iOS 26) and Android (Android 16, with notes for Samsung Galaxy phones on One UI), in the order that frees the most space for the least risk. If your problem is a full iCloud or Google account instead (“iCloud storage is full”, “Your Google storage is almost full”), that is a different fix, and I cover it in how to free up cloud storage without paying.
One honest warning before you start: you do not need a “cleaner” or “booster” app. Both iOS and Android now show you exactly what is using space and let you remove it in a few taps. The only extra app I suggest below is Files by Google on Android, and only because it makes finding duplicates and big files faster.
Step 0: back up before you delete anything
Most of the space on a phone is photos and videos, and those are the files you can never get back. So the first step is boring but non-negotiable: make sure your camera roll is backed up somewhere before you start removing things.
On iPhone, the simplest check is Settings > [your name] > iCloud > Photos and confirm that “Sync this iPhone” is on, or open Google Photos and look for “Backup complete” at the top if you use that instead. On Android, open Google Photos, tap your profile picture and check the backup status line. If it says “Backup is off” or shows a number of items waiting, fix that first and let it finish on Wi-Fi.
I wrote a full walkthrough of the options (Google Photos, iCloud Photos, OneDrive and a copy on your own computer) in how to back up your phone photos. If you are already backed up, carry on.
Step 1: see what is really using your storage
Guessing wastes time. Both systems have a storage screen that sorts everything by size, and it often surprises people. On plenty of phones the biggest single item is not photos at all but offline music playlists or downloaded TV episodes from a trip months ago.
On iPhone (iOS 26)
Go to Settings > General > iPhone Storage. Give it a few seconds to calculate. At the top you get a colored bar (Apps, Photos, Media, Messages, iOS, System Data), then a list of recommendations, then every app sorted by size. Tap any app to see how much is the app itself and how much is “Documents & Data”. Apple explains each category on its page How to check the storage on your iPhone and iPad.
The recommendations are worth reading one by one. Depending on what is on your phone, you may see “Offload Unused Apps”, “Review Large Attachments”, “Review Downloaded Videos” or “Recently Deleted” photos waiting to be cleared.
On Android 16 (Pixel and most phones)
Open Settings > Storage. You will see categories such as Apps, Images, Videos, Audio, Documents and other, Trash and System. Tap a category to see what is inside. Near the top there is a “Free up space” button that groups old screenshots, large files, unused apps and downloads. Google’s own guide is Free up space on your Android device.
On Samsung Galaxy (One UI)
Samsung puts it in a different place: Settings > Device care > Storage. On older One UI versions the menu is called “Battery and device care” instead of “Device care”. The Samsung screen shows Recycle bin, Duplicate files, Large files and Unused apps as separate shortcuts, which is handy because those are the four places space hides.
Step 2: empty the trash folders you forgot about
Deleting a photo rarely frees space right away. Both systems move it to a trash folder first, and that folder keeps counting against your storage for weeks.
On iPhone, open Photos, scroll to the bottom of the Library to Utilities > Recently Deleted, authenticate with Face ID, tap Select and then Delete All. Items stay there for about 30 days otherwise.
On Android, Google Photos has its own trash under Collections > Trash (or Library > Trash in some versions). On a Pixel, Settings > Storage > Trash also shows files deleted from the Files app. On Samsung, open Gallery, tap the menu (three lines) and choose Recycle bin, then Empty. The Samsung “My Files” app has a separate Recycle bin, so check both.
This step alone often gives back 2 to 5 GB on a phone that has never been cleaned.
Step 3: clear out message attachments and WhatsApp media
Messaging apps are the quiet storage hogs. Every video someone sends to a group chat stays on your phone, often twice if you also saved it to your gallery.
iMessage on iPhone
The fastest route is the recommendation in Settings > General > iPhone Storage called “Review Large Attachments”. It lists videos, photos and files from all your conversations, biggest first. Swipe left on an item to delete it.
You can also do it per conversation: open the chat, tap the contact’s name at the top, tap Photos, then Edit > Select Photos and delete the ones you do not need.
If you have years of history and do not care about old texts, there is a setting that trims them automatically: Settings > Apps > Messages > Keep Messages, then choose 1 Year or 30 Days instead of Forever. Be careful here. It deletes every message older than that, text and media, and if Messages in iCloud is on, it deletes them on your other Apple devices too. Save anything you might need (receipts, addresses, family photos) first.
Google Messages and Samsung Messages on Android
In Google Messages, open a conversation, tap the contact name at the top, then look at the media section and long-press items to delete them. Samsung Messages works the same way: open the chat, tap the menu and look for the media or “Media, links, and files” view. There is no global “large attachments” list on Android, so this is the one place where the storage screen in Step 1 helps most: it tells you whether Messages is big enough to bother.
WhatsApp (both phones)
WhatsApp has an excellent built-in cleaner that most people never open. Go to WhatsApp > Settings > Storage and data > Manage storage. At the top you see items “Larger than 5 MB” and items “Forwarded many times” (the memes and chain videos). Below that, every chat is sorted by how much space it uses. Tap a chat, sort by size, select the biggest files and delete them.
While you are on that screen, look at “Media auto-download” under Storage and data. Setting videos to “Never” on mobile data and Wi-Fi stops the problem from coming back. You can still tap any video to download it when you actually want to watch it.
On iPhone there is one more setting: WhatsApp > Settings > Chats > Save to Photos. If it is on, every received photo is stored twice, once in WhatsApp and once in your camera roll. I turn it off.
Step 4: remove, offload or archive apps you do not use
Apps are the second biggest category on most phones, and games are the worst offenders. A single mobile game can take 10 GB or more once it downloads its extra content.
Offload apps on iPhone
Offloading removes the app itself but keeps your documents and data, so when you download it again from the App Store you pick up where you left off. To do it for one app, go to Settings > General > iPhone Storage, tap the app and choose Offload App. To let the phone do it automatically when space runs low, tap Enable next to “Offload Unused Apps” on the same screen, or turn it on at Settings > Apps > App Store > Offload Unused Apps.
If you want the data gone too, choose Delete App instead. That is the right call for games you finished or apps you only used once.
Archive apps on Android
Android has its own version called archiving. On Android 15 and 16 you can archive a single app from Settings > Apps > [app name] > Archive. The icon stays on your home screen with a small cloud symbol, and tapping it downloads the app again with your data intact.
For the automatic version, open the Google Play Store, tap your profile picture, then Settings > General and turn on “Automatically archive apps”. Play will archive apps you rarely use when storage gets low. Not every app supports it (preloaded Google apps do not), but most apps from the Play Store do.
On Samsung, Settings > Device care > Storage > Unused apps shows apps you have not opened in a long time. Pick the ones to delete in bulk.
Step 5: clear cache and offline downloads
Cache is temporary data apps keep to load faster: thumbnails, video previews, web pages. Clearing it is safe, but it comes back as you use the app, so treat it as a one-off boost and not a routine.
On Android 16, go to Settings > Apps > [app name] > Storage & cache > Clear cache. On Samsung the path is Settings > Apps > [app name] > Storage > Clear cache. The usual big ones are Chrome, Instagram, TikTok, Facebook and Google Maps. Do not tap “Clear storage” or “Clear data” unless you mean it: that wipes the app’s settings and logins, like a fresh download.
On iPhone there is no “clear cache” button for most apps. The only clean way to reset an app’s cached data is to delete it and download it again. Safari is the exception: Settings > Apps > Safari > Clear History and Website Data. Some apps, such as TikTok and Spotify, have their own “Clear cache” option inside their settings menu.
Offline downloads are a bigger target than cache. Check these in each app:
- Spotify: Settings > Storage, and remove downloaded playlists you no longer play.
- Netflix and other streaming apps: the Downloads tab, then delete episodes you already watched.
- Google Maps: your profile picture > Offline maps, and delete old regions.
- Podcasts: on iPhone, Settings > Apps > Podcasts lets you remove played episodes automatically.
- Apple TV app: Settings > General > iPhone Storage > TV > Review Downloaded Videos.
Step 6: let the photo app remove what is already backed up
Once Step 0 is done, your photos live in the cloud and the copies on the phone are spare copies. You can remove those spares and keep viewing everything through the app.
On Android with Google Photos, tap your profile picture and choose “Free up space on this device”. The app shows how much it will free and only deletes items that are already backed up. Items from the last 30 days may stay on the phone. Google describes it in Free up space on your device. Android 16 phones also have Smart Storage at Settings > Storage > Free up space > menu > Settings, which removes backed-up photos automatically when storage runs low.
On iPhone with iCloud Photos, go to Settings > [your name] > iCloud > Photos and choose “Optimize iPhone Storage”. The phone keeps smaller versions and downloads the full-size original when you open a photo. On a phone with a 40 GB library this can give back 25 GB or more.
One trap on iPhone: Google Photos also has a “Free up space” option on iOS, but if iCloud Photos is turned on, deleting from the iPhone library deletes from iCloud too. If you use both services, stick to “Optimize iPhone Storage”.
Files by Google finds the rest (Android)
Files by Google is a free file manager from Google that shows “Clean” suggestions: duplicate files, large files, old screenshots, downloaded files and memes from messaging apps. Each card tells you how much space you get back, and you review the files before deleting. It is good for people who never open their Downloads folder, which is most of us. The limitation is that it only sees files, not app data, so it will not help with a 9 GB game. It is Android only; on iPhone the built-in Files app plus the storage screen covers the same ground. Tip: open the “Large files” card first and sort by size.
If you scan a lot of receipts and documents, check whether your scanner app is saving duplicate copies to the gallery. Some do. My list of the best document scanner apps notes which ones keep files inside the app.
Common questions
What is “System Data” on iPhone and can I delete it?
System Data is caches, logs, Siri voices and other temporary files the system manages. You cannot delete it directly. It usually shrinks on its own after a restart or after you clear big apps such as Safari and Messages. If it stays over 20 GB for weeks, restarting and then running a system update often brings it down.
Do phone cleaner apps work?
Most just do what the built-in tools already do, with ads on top. Some show alarming warnings to sell a subscription. On Android, Files by Google and the Settings > Storage screen are enough. On iPhone, apps cannot clear other apps’ data at all, so a “cleaner” can only look at your photos.
How much free space should I keep?
I aim for at least 10 percent of the total, so around 12 GB on a 128 GB phone. Below that, system updates fail to download and the camera may refuse to record long videos.
Will clearing storage make my phone faster?
A phone that is almost completely full can feel slow, and freeing space helps there. Beyond that, storage has little to do with speed. If battery is your real complaint, my guide on making your phone battery last longer covers the settings that matter.
My 20-minute cleanup order
If you only have a short break, do it in this order, because it front-loads the big wins:
1. Confirm your photos are backed up (5 minutes, longer if the upload has to finish on Wi-Fi).
2. Open the storage screen and note your top five items.
3. Empty Recently Deleted or the Recycle bin.
4. Run WhatsApp’s Manage storage and delete files larger than 5 MB.
5. Delete or offload the two biggest apps you have not opened in a month.
6. Remove offline downloads in Spotify, Netflix and Maps.
7. Turn on Optimize iPhone Storage or use “Free up space on this device” in Google Photos.
On a typical two-year-old phone this frees 10 to 20 GB. After that, turn on the automatic options (Offload Unused Apps on iPhone, Automatically archive apps and Smart Storage on Android, WhatsApp auto-download set to Never for videos) so you are not repeating this every month. And if your phone is fine but your iCloud or Google account is the one complaining, head to the cloud storage guide next.
