On a 128GB iPhone, app Documents & Data alone can quietly occupy 5–10GB or more — none of it showing up in your Camera Roll, all of it sitting there waiting for you to find it. PDFs saved from emails, spreadsheets downloaded for a meeting last spring, browser files, app documents: every one of them stays on your device indefinitely until you remove it manually.
Here's how to find those files and reclaim the space.
Why Downloaded Files Accumulate Without Warning
iOS doesn't alert you when the Files app grows by a gigabyte. There's no badge, no automatic cleanup, no nudge. Every file you save, every attachment you open, every document a third-party app creates lands in its own folder and stays there.
The problem is visibility — or the lack of it. Your Photos app shows you every image clearly. Downloaded documents are buried inside the Files app, two or three taps deep. Honestly, the Files app should make this more obvious than it does, but it doesn't, so this is one of those things you have to know to check.
Step 1: Find Out Which Apps Are Storing the Most
Go to Settings > General > iPhone Storage and wait a few seconds for the list to load.
Tap any app near the top of the list. You'll see two numbers: App Size (the software itself) and Documents & Data (everything the app has saved or cached). A large gap between the two — say, 90MB app size and 650MB documents — is a clear signal there's something worth cleaning up.
Start with Mail, Notes, Pages, Safari, and any cloud storage apps you have installed. These are consistently the biggest accumulators for most people.
Step 2: Open the Files App and Audit Local Storage
In the Files app, tap Browse at the bottom, then On My iPhone.
You'll see folders organized by the apps that created them. Go through each one. The things worth deleting first: files you downloaded for a one-time purpose and never reopened, attachments saved from group chats, PDF receipts from months ago, and anything with an old date you don't recognize.
To delete multiple files at once, tap the three-dot menu (···) and choose Select. Mark what you want gone, then hit delete. Sorting by Size or Date Added helps you spot the worst offenders quickly.
Step 3: Check iCloud Drive Downloads
Still in the Files app, go to Browse > iCloud Drive > Downloads.
Files here are synced to your iCloud account, but they're also cached locally on your device when you've opened them — meaning they count toward your device storage even though they're nominally "in the cloud." Old Keynote decks, Pages documents from finished projects, PDF templates you downloaded once and forgot — all of this can add up to several hundred megabytes or more.
Step 4: Clear Documents From Individual Apps
Each app handles its own document storage differently.
Safari: Go to Settings > Apps > Safari > Clear History and Website Data. This wipes cached page resources and locally stored files. One caveat: it will also sign you out of websites, so be ready to log back in.
Notes: Open the Notes app, tap Edit in the top right, and delete notes that contain scanned documents or image attachments. A single note with a PDF scan can run 80–150MB without any obvious indication.
Mail: Apple doesn't offer bulk attachment deletion — you have to find large emails and delete them manually from within the Mail app. If Mail's Documents & Data has ballooned to several gigabytes and manual cleanup feels impossible, deleting and reinstalling the app is the nuclear option. Just make sure your mail is server-based (Gmail, Outlook, iCloud Mail) so nothing is lost.
For any third-party apps with large Documents & Data, look for a "Clear Cache," "Manage Offline Files," or "Storage" option buried in the app's own settings menu — many apps have one.
Step 5: Empty the Recently Deleted Folder
This step gets skipped by almost everyone on their first cleanup.
When you delete files in the Files app, they don't disappear immediately — they move to a Recently Deleted folder and stay there for 30 days. During that window, they still use device storage.
To actually free the space: in the Files app, go to Browse > Recently Deleted, tap the three-dot menu, choose Select All, and delete. This is the step that makes the storage number in Settings actually drop.
Step 6: Delete Apps That Won't Let You Clean Up
Some apps don't expose a way to clear their document storage from within the app or the Files interface. If Settings shows an app with 2–3GB in Documents & Data and there's no cleanup option inside it, the only path is deleting the app entirely.
Go to Settings > General > iPhone Storage, tap the app, and choose Delete App. This removes both the software and all associated data. Reinstalling afterward starts the Documents & Data counter at zero.
Before doing any mass deletion, back up your iPhone photos if you haven't recently — it takes a few minutes and prevents any unpleasant surprises.
After Files, Photos Are Usually the Bigger Issue
A thorough Files app cleanup typically recovers anywhere from a few hundred megabytes to a couple of gigabytes. That's enough to buy breathing room on a full iPhone, but probably not enough to transform a storage situation long-term.
Photos and videos are usually the underlying culprit. EverClean AI (free to download on the App Store) scans your photo library on-device to identify duplicates, near-duplicate bursts, and large video files. It's a natural follow-up once you've cleared the documents layer.
For a full-spectrum storage cleanup, see: How to Free Up Storage on iPhone.
The Short Version
Documents pile up in the Files app, in Mail, in Notes, and in every app that saves content locally. Settings > iPhone Storage shows you exactly where. Empty what you don't need, clear the Recently Deleted folder so the space actually frees up, and check your photo library when you're done. Most people find several gigabytes they didn't know they had.