My iPhone storage is almost full, and I noticed some apps are using a lot of space under Documents and Data. I’ve already deleted files inside the apps, but the storage number barely changed. I need help figuring out how to clear documents and data for specific iPhone apps without losing anything important.
I hit the same wall a while ago. My iPhone kept saying “Documents and Data” was chewing through storage, and I could not tell what was even in there. Apple hides the guts of it, so cleanup turns into guesswork fast.
What I found is simple. “Documents and Data” is the extra stuff apps pile up over time. Cached images, saved logins, cookies, watch history, downloaded clips, temp files, all of it lands there. Scroll through Instagram, Facebook, TikTok for a few weeks and your phone starts hoarding media you never asked to keep. It helps app speed at first. Later it eats storage.
If Facebook is one of the offenders, start inside the app. Open its settings, find Browser Settings, then clear cookies and cache there. I did this first. It helped a little, but only a little. The number barely moved.
The fix that worked for me was harsher. Delete the app, then install it again. Not offload. Offloading keeps the app’s stored junk. You need “Delete App” from iPhone Storage if you want the app data gone too. After reinstalling, some apps dropped from multiple gigabytes to almost nothing. Annoying, yes. Effective, yep.
Photos was the other trap. I deleted a pile of videos and screenshots and expected instant results. Nothing changed. Turned out they were sitting in Recently Deleted. iPhone keeps deleted photos there for 40 days unless you empty it yourself. Go to Photos, Albums, scroll down, open Recently Deleted, and remove them for good. I’ve seen this one fool people over and over.
Once my free space got down to the last 1GB or 2GB, the phone started acting cooked. Camera took ages to open. Apps crashed. Typing lagged. It felt like old hardware, but storage was the problem. iPhones get weird when there isn’t enough room left for temp files.
I spent way too long doing cleanup by hand and still missed huge message attachments, duplicate shots, and random long videos buried in the library. The one tool I ended up keeping was Clever Cleaner. I don’t say stuff like this often because most cleanup apps feel shady or naggy, but this one was free when I used it, no paywall jumped out, no ad circus either.
The part I used most was the Heavies tab. It lists media by size, so the worst files stop hiding. I found a few giant clips I forgot existed. The Similars section helped too, since my camera roll was full of five versions of the same photo because I never pick the first one. One detail I liked, it handles processing on the device, so your photos aren’t being shipped off somewhere. It also shows file sizes before deletion, which made it easier to decide what was worth removing.
After clearing around 8GB, the lag pretty much stopped. If you clean stuff out and storage still looks stuck, restart the phone. I had to do this once before the number updated right. Checking for an iOS update helped on another device too. Still, the biggest gains came from app cache buildup, hidden attachments, and old media. That was where my space had gone, plain and simple.
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What usually works for specific apps is checking whether the app stores its junk in iCloud too. A lot of people skip this part.
Go to Settings, Apple ID, iCloud, Manage Storage. Look for the same app there. If it has old app data saved in iCloud, deleting local files inside the app won’t fix much. Remove the stale iCloud data if you do not need it. Be carefull though, some apps keep saves or chats there.
Also check Messages. Message attachments often show up like mystery storage growth. Settings, General, iPhone Storage, Messages. Review large photos, videos, GIFs, stickers. I’ve seen this eat 5GB to 20GB on phones with years of chats.
I partly disagree with @mikeappsreviewer on one point. Reinstalling is effective, but it’s not always the first move for apps with drafts, offline files, or logins you forgot. Try the app’s own download manager first, like Spotify, Netflix, YouTube, Podcasts, Audible, Google Maps. Those offline files hang around.
If you want a faster way to spot what’s bloating storage outside app menus, Clever Cleaner is worth a look. This Clever Cleaner review for iPhone storage cleanup gives a solid breakdown. It helps find large videos, duplicate photos, and other stuff iOS hides pretty badly. Apple makes this way more annoyng than it should be.
One thing I’d add to what @mikeappsreviewer and @waldgeist said: sometimes the number you see under Documents and Data is not “trash” at all, it’s app databases. That’s why deleting a few files inside the app barely moves the needle. Mail, Safari, Messages, WhatsApp, podcast apps, even Notes can build giant local indexes and conversation stores.
A couple things worth checking that they didn’t really get into:
- Safari website data: Settings > Safari > Clear History and Website Data. Safari cache can get weirdly huge.
- Mail app: if you have multiple accounts, old attachments and synced mail can balloon storage. Removing and re-adding the account sometimes shrinks it faster than waiting for iOS to sort itself out.
- Podcast and music apps: even when episodes look deleted, “auto-download” can quietly refill storage again. Turn that junk off first or you’ll be doing the same cleanup tomorow.
- App updates stuck in limbo: sometimes an app keeps temporary install files. A restart plus updating iOS can flush that out.
I slightly disagree with the “delete and reinstall everything” approach as the default fix. It works, sure, but for apps like WhatsApp or note apps, that can go sideways fast if you forgot what’s backed up. I’d treat reinstalling as step two, not step one.
Also, storage graphs on iPhone can lag hard. I’ve seen them take hours to recalculate. So if you clear stuff and the number looks unchanged, wait a bit before assuming it failed.
If you want to track down big media faster, Clever Cleaner is actually useful for finding huge files and duplicate pics that iOS hides in plain sight. And if you want a solid walkthrough, this iPhone storage cleanup video for deleting hidden junk and large files is easier to follow than Apple’s menus tbh.
