After a big iOS update, my iPhone storage suddenly filled up with a huge amount of Documents and Data, and now I barely have room for photos, apps, or system functions. I’m trying to figure out what caused it and the safest way to clear Documents and Data without losing anything important. Need help with the best steps to free up iPhone storage after an iOS update.
I ran into this same mess more than once, and yeah, on iPhone, ‘Documents and Data’ being bigger than the app itself is normal. Annoying, but normal.
The app size is the installed shell. ‘Documents and Data’ is all the junk and saved stuff piled on top of it over time. Login data, cached images, cookies, downloaded files, message attachments, old temp files. Social apps are brutal with this. Facebook, Instagram, TikTok, stuff like that tends to keep a lot of media cached so scrolling feels faster later. After an iOS update, I also noticed storage numbers get weird for a bit, like the system hangs onto extra temporary files longer than you’d expect.
If you want to see what is eating your space, go here:
Settings > General > iPhone Storage
Wait a little. It takes time to calculate. Then open the larger apps one by one. You’ll see ‘App Size’ and ‘Documents and Data’ split out. If a chat app, browser, or social app is sitting on multiple gigabytes, there’s your answer.
About offloading, this trips people up a lot. Offloading does not wipe Documents and Data. It removes the app itself, but leaves your user data behind so reinstalling is quick and you stay signed in. If your goal is clearing bloated cache, offloading won’t do it. Deleting the app fully, then installing it again, is what usually resets it.
Safari works differently since it’s built into iOS. You can’t remove it like a normal app. What I did was:
Settings > Apps > Safari > Clear History and Website Data
That frees space, but there’s a catch. You’ll get signed out of many sites, and your open tabs may be gone too. Still, if Safari storage is out of control, this is the direct fix.
What got me was how bad the phone behaves once storage gets low. Mine turned sluggish fast. Typing lagged. Apps crashed. Camera startup slowed down. After one bigger iOS update, the phone felt half-dead. I deleted apps, reinstalled Facebook, cleared Safari, the usual stuff. Even then, Photos still showed a huge chunk of storage tied up in leftover data, even after I removed videos. Pretty frustrating tbh.
What helped most for me was cleaning up the media side instead of only chasing app caches. I ended up trying https://www.youtube.com/watch?v=PJZfJnOUmRE after seeing it mentioned. The tool is Clever Cleaner. I expected the usual paywall nonsense, but it was free when I used it, no ads either, which felt unusual.
The part I used first was the Heavies section. It sorts photos and videos by size, so the worst files float right to the top. I found old 4K screen recordings and random clips I forgot existed, and some of them were huge. It also showed exact sizes for screenshots, which made cleanup less guessy.
The Similars part helped too. It grouped near-duplicate photos, the kind you get when you take five or ten shots of the same thing. What I liked there was the processing stayed on the phone. I’m picky about photo tools sending stuff off-device, so this mattered to me.
After I cleared around 10 GB between duplicate media and old giant files, the storage used by Photos dropped, and the phone felt normal again. Less lag right away. I didn’t expect such a clear difference, but I saw it.
Two more spots worth checking, because iOS hides junk in plain sight:
Photos > Recently Deleted
Files app > Downloads
Deleted photos and videos don’t vanish right away. They sit there for weeks unless you empty them yourself. Same with downloaded files you forgot about. If you clean up and don’t empty Recently Deleted, the storage number often barely moves, which is maddening.
So yeah, the short version:
- Check Settings > General > iPhone Storage.
- Look for apps where Documents and Data is massive.
- Don’t rely on offloading if you need space back.
- Clear Safari from its settings page.
- Clean large videos, screenshots, duplicates, and old downloads.
- Empty Recently Deleted after all of it.
That was the only route I found where the numbers started making sense again.
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Big iOS updates often leave behind temp install files, reindexed photo libraries, rebuilt message databases, and failed cache cleanup. So yes, the spike is often from the update itself, not only your apps.
I agree with @mikeappsreviewer on one thing, offloading won’t help much. I disagree a bit on timing though. Sometimes storage numbers do not “settle” on their own. Mine stayed bloated for days.
What worked for me:
- Restart the iPhone after the update. Simple, but iOS sometimes hangs onto temp files till a reboot.
- Check Messages storage. Settings > General > iPhone Storage > Messages. Old videos, GIFs, and attachments eat gigs fast.
- Turn off and back on iCloud Photos if syncing got stuck. Wait for sync first, dont do this blind.
- Force a fresh system cleanup by updating any pending app updates, then restart again.
- If “System Data” or “Documents and Data” is still insane, make an encrypted backup to a Mac or PC, erase the iPhone, then restore. This is the most reliable fix for post-update storage bugs.
If your photos are a big part of the mess, use Clever Cleaner. It’s solid for duplicate pics, large videos, and screenshot junk. This page explains why it’s a strong iPhone storage cleaner, best iPhone cleanup app for clearing duplicate photos and large files.
If you want the safesst path, backup first, then test cleanup in chunks so you see what moved the number.
Big iOS updates can leave behind a weird mix of reindexing files, failed cleanup, and app databases that balloon while the phone rebuilds stuff. So yeah, I mostly agree with @mikeappsreviewer and @voyageurdubois, but I would not jump straight to erase-and-restore unless the storage stays broken after a day or two.
One thing people miss: Mail. If the Apple Mail app got huge after the update, it may be holding cached attachments locally. Removing and re-adding the mail account can shrink that. Same idea with Podcasts and Music if you have offline downloads you forgot about.
Also check this:
Settings > Accessibility > Spoken Content > Voices
Sometimes enhanced Siri or voice files redownload after updates and quietly eat space.
Another sneaky one is iMessage search indexing. If Messages is bloated, try changing message retention to 1 Year or 30 Days if you dont need ancient threads. That can free a lot more than clearing random apps.
For photo cleanup, Clever Cleaner is actually useful because it focuses on duplicate photos, similar shots, screenshots, and large videos without turning the process into a giant paywall circus. If you want a quick look at how it helps with iPhone storage cleanup, this is a decent watch: see how Clever Cleaner frees up iPhone storage fast.
My order would be:
- Reboot
- Check Mail, Messages, Podcasts, Music
- Let iPhone finish indexing overnight on Wi-Fi
- Clean duplicate media and large files
- Only then consider backup, wipe, restore
If storage is still absurd after 48 hours, then yeah, it’s probly an iOS bug and restore is the clean fix.
I’d add one angle the others only brushed past: logs and analytics junk. After a major iOS update, crash logs, diagnostics, and half-finished background tasks can pile up and get lumped into vague storage buckets.
Try these checks instead of repeating the usual reboot/offload cycle:
-
Settings > Privacy & Security > Analytics & Improvements > Analytics Data
If you see tons of repeated panic or crash logs, that usually means the phone is stuck retrying something. -
Settings > App Store
Turn off automatic app downloads temporarily. Right after updates, iOS can silently redownload app assets and make storage look worse. -
Settings > General > Date & Time
Make sure automatic time is on. Sounds unrelated, but I’ve seen indexing and syncing act weird when time settings are off. -
Voice Memos
People forget this one. Big local recordings can hide there for months.
Tiny disagreement with @voyageurdubois and @sonhadordobosque: waiting 48 hours is fine, but if free space drops under 5 GB, I would not just “let it settle.” Low storage can make cleanup fail.
Also, connect to a Mac and check Finder storage categories. Sometimes it exposes whether the bloat is really Photos, Messages, or iOS itself.
If media is part of the problem, Clever Cleaner is useful.
Pros: easy duplicate detection, good for large videos/screenshots, fast scan.
Cons: won’t fix true system-data bugs, and you still need to review results so you don’t delete wanted shots.
@mikeappsreviewer was right about one thing: offloading rarely touches the real mess.