I keep getting iPhone storage almost full warnings and it’s slowing everything down. I’ve already deleted a bunch of apps and photos, but it still says I’m low on space. What are the best practical steps or hidden settings to clear up storage without losing important data?
Yeah, iOS storage is sneaky. Deleting a few apps and photos usually does almost nothing because the heavy stuff hides in caches and “System Data”. Here is what tends to work best, step by step.
-
Check what is actually huge
Go to Settings > General > iPhone Storage.
Wait a bit for it to load.
Look at the top apps in the list. Focus on anything over 1 GB. -
Messages clean up
iMessage attachments get huge.
Settings > Messages > Keep Messages > set to 1 Year or 30 Days.
Then in iPhone Storage > Messages > tap “Review Large Attachments”.
Delete long videos, big photos, and GIFs from old threads.
You keep the conversation text, you remove the heavy media. -
Photos and Videos
In Photos app, delete big videos first. Sort by “Videos” in Albums.
After deleting, go to Photos > Albums > Recently Deleted and empty it.
Turn on Settings > Photos > iCloud Photos and enable “Optimize iPhone Storage” so full‑res originals live in iCloud only.
Also check Settings > Photos > turn off “Download HDR Video to Mac” if you sync, those files are chunky. -
WhatsApp, Telegram, etc
Chat apps chew storage.
In WhatsApp > Settings > Storage and Data > Manage Storage.
Clear large videos and forwarded junk from groups.
Do similar in Telegram, Signal, etc.
Look for a “Clear cache” or “Storage usage” screen and wipe cached media. -
Streaming app caches
Open apps like Netflix, Spotify, YouTube, TikTok.
Remove offline downloads you no longer watch or listen to.
In Spotify > Settings > Storage > Clear cache.
In TikTok > Profile > Settings > Cache > Clear.
These alone often free multiple GB. -
Safari and browser data
Settings > Safari > Clear History and Website Data.
If you use Chrome or others, open their settings and clear browsing data and cache.
This helps if you have months of cached junk. -
Offload unused apps
Settings > General > iPhone Storage > enable “Offload Unused Apps”.
iOS removes app binaries but keeps your data.
You tap the grayed-out icon to reinstall if you ever need it. -
Deal with “System Data” bloat
This part gets weird. “System Data” sometimes inflates from cache and logs.
Things that tend to shrink it:
• Restart your iPhone after a big cleanup.
• If you use VPNs or beta profiles, remove ones you do not use.
• Keep at least 5 to 10 GB free if your total storage is small, iOS works smoother. -
Auto-delete old voice memos and downloads
Voice Memos and Files app both hold large audio and PDFs.
In Files > On My iPhone, delete old downloads.
Manually clear old recordings in Voice Memos. -
Use a cleaner helper app
For junk like duplicate photos, similar shots, and giant videos, a helper app speeds it up.
The Clever Cleaner App for iPhone focuses on duplicate and similar photos, burst shots, large videos, and contact cleanup. It groups similar items so you remove dozens in a few taps instead of hunting through your whole library.
If you want to automate some of this, check this link:
clean up your iPhone storage with Clever Cleaner App -
Nuclear option if nothing helps
If storage still looks wrong, do a clean restore.
• Backup to iCloud or a computer.
• Settings > General > Transfer or Reset iPhone > Erase All Content and Settings.
• Set up as new iPhone first, check storage.
• Then restore your backup.
This often clears stubborn cached “Other” system junk.
Do those in order, watch the “iPhone Storage” screen after each group of steps, and you should see a few extra GB open up. The big wins usually come from Messages, WhatsApp, streaming downloads, and photo/video cleanup with a helper app.
Yeah, iOS storage is a bit of a liar. Even when you delete apps and photos, the “almost full” warning keeps coming back because of stuff that doesn’t show up clearly. @cazadordeestrellas already nailed most of the obvious and semi‑hidden things, so I’ll skip repeating those steps and add a few other angles (and push back on a couple).
1. Stop “helpful” downloads in the background
Some of the worst storage hogs are auto-downloads you forgot you turned on:
-
Settings > App Store
- Turn OFF “Automatic Downloads” for Apps and App Updates.
- Turn OFF “Automatic Downloads” for Videos in Apple TV app if you see it.
- Under “Video Autoplay,” disable it in Store apps where possible so they don’t cache as much random junk.
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Books / Podcasts / Apple TV
- In Podcasts > Settings, turn off “Automatically Download” for every show, or set download limits like “Most Recent 3 Episodes.”
- In Apple TV app > Settings > Download Options, set lower quality downloads and manually remove finished shows.
This prevents your phone from refilling itself right after you clean it.
2. Tame email storage (Mail is sneaky huge)
Mail can quietly eat several GB, especially if you have multiple accounts.
- Settings > Mail > Accounts > Fetch New Data
- Put rarely used accounts on “Manual” instead of Push.
- In the Mail app, go into big folders (like “All Mail” or “Sent”) and search:
- Search for “has:attachment” or filter by attachments if your provider supports it.
- Delete old newsletters and giant PDFs.
- In Settings > Mail > Accounts > [Your account] > Advanced, reduce how much mail is kept offline if the provider lets you.
If Mail is huge under Settings > General > iPhone Storage, you can even remove the account and re-add it to flush cached mail.
3. Reduce how heavy new photos & videos are (future-proofing)
I kinda disagree slightly with relying only on iCloud Photos like @cazadordeestrellas suggested. It helps a lot, but if your iCloud storage is tiny or full, it can become another “almost full” problem in the cloud.
Also do this:
- Settings > Camera > Formats
- Use “High Efficiency” instead of “Most Compatible” so new photos/videos take less space.
- Settings > Camera > Record Video
- Drop to 1080p HD at 30 fps unless you really need 4K/60. That stuff is massive.
- If you record slo-mo or HDR a lot, reduce frame rates and only turn HDR on when you actually want it.
That way you’re not generating more 500 MB clips every time you sneeze.
4. Kill “helpful” Downloads folder junk
People forget this one:
- Open Files app
- Go to “On My iPhone” > “Downloads” or any random app folders.
- Delete old ZIPs, PDFs, videos, and installers you don’t need.
This often frees gigabytes if you share files through AirDrop or browsers.
5. Manage app-specific “offline” crap that isn’t obvious
Beyond the streaming apps already mentioned:
- Maps
- Apple Maps: If you use offline maps (iOS 17+), open Maps > your profile / initials > Offline Maps and delete old regions.
- Google Maps: Tap your profile > Offline maps > remove old areas you don’t use.
- Reading apps (Kindle, Pocket, news apps)
- Look for “Downloaded” or “Offline” sections and remove old books, magazines, saved articles.
These things hide under the friendly label of “content” but behave like a slow leak in your storage.
6. Be smarter about iCloud so it actually saves space
Sometimes people turn on iCloud Drive for apps and it duplicates instead of freeing space.
- Settings > [your name] > iCloud > iCloud Drive
- Disable iCloud Drive for apps you don’t use or don’t need syncing, so they don’t keep local + cloud copies.
- Settings > [your name] > iCloud > Manage Account Storage
- Check if you’re backing up 3 old iPhones. Delete old device backups there.
- In Settings > [your name] > iCloud > Photos, if you use iCloud Photos, you really need “Optimize iPhone Storage” on. If it’s set to “Download and Keep Originals,” you are wasting space.
I’ve seen phones get back several GB by just deleting one ancient iPhone backup and toggling optimization properly.
7. When “System Data” is insane, do a half-reset first
Before going all-in on the full wipe like @cazadordeestrellas mentioned, try a lighter version:
- Back up to iCloud or a computer.
- Then:
- Settings > General > Transfer or Reset iPhone > Reset > “Reset All Settings” (not erase all content).
This keeps your data but resets a bunch of settings and can shrink caches, network logs, etc. Not as powerful as a full wipe, but also not as painful.
- Settings > General > Transfer or Reset iPhone > Reset > “Reset All Settings” (not erase all content).
8. Use a smarter cleaner instead of tapping forever
Doing all this manually is mind-numbing. A dedicated cleaner app can be worth it if you’re constantly fighting storage.
The Clever Cleaner App is actually solid for:
- Finding duplicate photos and near-duplicates
- Surfacing very large videos
- Cleaning up burst shots and messy contact lists
You can scan, see grouped clutter, and trash dozens of items at once instead of scrolling like a zombie in Photos. If you want something that focuses on cleaning iPhone storage and media clutter, check this out:
clean up your iPhone storage fast with Clever Cleaner
It complements iOS’s own storage screen pretty nicely.
9. Accept that some apps are just storage pigs
Brutal honesty time: some apps are not worth the space unless you really need them daily.
- In Settings > General > iPhone Storage, tap a huge app and check:
- “App Size” vs “Documents & Data.”
- If “Documents & Data” is gigantic and the app has no proper “clear cache” button inside, the only real fix is:
- Delete the app
- Reinstall it fresh
This is painful for some social apps and games, but sometimes you free up 3 to 8 GB in one shot.
If you combine:
- Disabling background auto-downloads
- Reducing how huge new videos/photos are
- Cleaning Mail, Files, and offline content
- Nuking a couple of cache-heavy apps
- Using something like Clever Cleaner App to fast-delete duplicates & big media
you’ll usually get out of the “iPhone storage almost full” loop and keep it that way, instead of just watching the warning come back every week.
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Skip the usual “delete photos and apps” routine, because you already did that and @kakeru / @cazadordeestrellas covered the obvious and semi‑hidden stuff very well. Here are a few angles they did not dig into as much, plus a reality check on what actually lasts.
1. The “app gets fat again” problem
A lot of apps behave like this:
- Fresh install: 300 MB
- A few weeks later: 3–6 GB
Even if you clear cache inside the app, some store logs and hidden media that never really die. Social apps, big games, and office suites are classic offenders.
What to do differently
- In Settings > General > iPhone Storage, tap an app and compare:
- App Size vs Documents & Data
- If Documents & Data is several times the App Size and the app has no proper “clear cache” that actually moves the needle, treat it like a temporary app:
- Delete it entirely every 1–2 months
- Reinstall only when you really need it
It is a bit inconvenient, but it is one of the only consistent long‑term fixes for bloated apps. I actually disagree with trying to “manage” some of these with micro‑cleanup. Wiping and reinstalling is faster and more predictable.
2. Photos: local control instead of only iCloud
Both @kakeru and @cazadordeestrellas lean pretty hard on iCloud optimization. It is useful, but:
- If your internet is slow, constantly re‑downloading photos is annoying.
- If your iCloud is small or near full, you just move the “storage almost full” problem to the cloud.
Extra tricks that keep you in control:
-
Use a computer or external drive as a real archive
- A few times a year, move old photos and especially videos to a Mac/PC or external drive.
- After confirming the backup, remove them from your iPhone and empty Recently Deleted.
This actually frees space permanently instead of hoping optimization keeps up.
-
Avoid massive bursts & Live Photos by default
- Turn off Live Photos when you do not care about the effect.
- Do not hold the shutter unless you truly want a burst.
You are preventing hundreds of near‑duplicates that any cleaner app later has to fix.
3. “Invisible” iCloud bloat that still hits the phone
Even if storage on the phone looks better, iCloud misconfig can sneak space back indirectly:
- iCloud Drive syncing big app folders that you never open
- Old device backups that keep automatic restore sizes huge
- Large shared Keynote / Pages / Numbers documents
What actually helps:
- In iCloud > Manage Account Storage, look at Backups and iCloud Drive and manually delete old device backups and giant unused folders.
- For some apps in iCloud Drive you can say “keep in cloud only,” which means the phone only fetches when needed instead of caching everything.
This is more about long‑term sanity. Your next phone restore will not immediately start half‑full.
4. Background “junk creators” to turn off
I side more with @kakeru here: killing auto downloads is critical. A few more specific ones that often get missed:
- Keyboard / sticker packs / filters that download content in the background
- Inside those apps, disable “auto download content” or similar.
- Cloud music lockers
- If you use Apple Music or Spotify plus another music app that caches tracks, pick one ecosystem and stop the other from storing “local” songs.
Otherwise every cleanup is temporary, because the phone just fills itself back up slowly.
5. Cleaner apps: where Clever Cleaner App fits
You mentioned wanting “best practical steps” and also “hidden settings.” At some point, tapping through thousands of thumbnails is not practical at all, which is where something like Clever Cleaner App actually makes sense as a tool, not magic.
Pros of Clever Cleaner App
- Finds duplicate and similar photos automatically so you do not need to eyeball every burst.
- Surfaces extra large videos and lets you clear them in batches.
- Cleans up contacts (duplicates, incomplete entries) which slightly helps storage but mainly helps organization.
- Much faster when you have years of photos and random screenshots.
Cons of Clever Cleaner App
- It still needs you to review, or you risk deleting photos you care about if you just tap blindly.
- Does not fully replace iOS storage settings; you still need to handle app bloat, Messages, streaming caches, etc.
- Like any cleaner, it is more useful as a periodic tool than a one‑time miracle. You have to run it once in a while.
Compared with the manual style suggested by @cazadordeestrellas and the more settings‑heavy approach from @kakeru, Clever Cleaner App acts as the “time saver” layer on top: they tell you where to look, the cleaner helps you delete faster once you are there.
6. A realistic maintenance routine
To keep the “iPhone storage almost full” warning from coming back:
Every month
- Open iPhone Storage and delete 1–2 worst offender apps, then reinstall if truly needed.
- Run Clever Cleaner App to trim duplicate/similar shots and large videos.
Every 3–6 months
- Move old photos and long videos to a computer or external drive and delete them from the phone.
- Clear offline stuff from reading / map / music / video apps.
- Remove ancient device backups from iCloud.
Once a year
- Consider “Reset All Settings” if System Data has grown absurd, before going for a full wipe.
Following that kind of schedule is usually the difference between constantly hitting the red bar and actually having 5–10 GB free so the phone stops choking.