How to Clear Documents & Data on iPhone (and App Cache)

You open Settings → General → iPhone Storage, tap an app, and see two numbers: App Size and Documents & Data. The second one is often huge. WhatsApp, Telegram, Spotify, Safari, and a dozen other apps can sit on several gigabytes with no obvious “Clear” button on that screen.

That line is the app’s sandbox: caches, downloads, drafts, and offline files. Photos is a different bar. App Size is the download from the App Store. This guide shows how to read the two numbers, what iOS will let you delete from Settings, and the in-app steps for Safari, Chrome, CapCut, Discord, and Instagram, TikTok, and Snapchat. Button names vary by iOS version — if yours says Storage instead of iPhone Storage, follow the same path.

What Documents & Data Actually Is

Every iOS app gets a private folder. Apple labels that folder Documents & Data. Typical contents:

• Caches — thumbnails, temporary downloads, web views. Sometimes iOS reclaims these; often it does not until you clean inside the app.
• Offline files — Spotify / Apple Music downloads, maps, files you opened once.
• Databases — chat history, search indexes, local settings.
• Downloaded media — WhatsApp videos, Telegram files, Safari PDFs that live in the app or in Files. Telegram has its own cache screen and a Keep Media limit: how to delete Telegram media.

It is not your Camera Roll (that is Photos). It is not the app binary (that is App Size). Mixing those three is why people offload WhatsApp and wonder why storage barely moved. For the system-wide leftover bar, see what System Data is on iPhone — a different bucket.

How to See App Size vs Documents & Data

1. Open Settings → General → iPhone Storage (some iOS builds label this Storage).
2. Wait for the list to finish calculating. The top apps are usually the ones that matter.
3. Tap an app. Read the two lines: App Size (the binary) and Documents & Data (the sandbox).
4. Note the Documents & Data number before you change anything so you know what you freed.

Sort mentally: Photos is its own row. Music, Podcasts, Safari, WhatsApp, and Telegram each have their own Documents & Data. What’s taking up space walks the bars in order if you want the full map.

What You Can (and Cannot) Delete on That Screen

On most apps, iPhone Storage offers Offload App and Delete App. It does not offer a universal Clear Documents & Data button. A few Apple apps expose extra actions (Music downloads, Safari data in Settings → Safari). Third-party apps almost never do.

• You cannot tap Documents & Data to empty it. That number is informational.
• Offload leaves Documents & Data in place. The icon stays, with a cloud badge, until you tap it again.
• Delete App removes the binary and the sandbox. Local chats, downloads, and caches that were not in iCloud are gone.

So if you want to keep the app and still shrink the number, you work inside the app — or you delete and reinstall knowing you will lose unsynced local data.

Safe Ways to Shrink Documents & Data (Per App Type)

WhatsApp and Telegram

Chat apps store media in the sandbox even when you also saved a copy to Photos. That is why WhatsApp can look huge twice. Open WhatsApp → Settings → Storage and Data → Manage Storage (wording varies). Review large chats, delete unused media in-app, and turn off auto-download of videos on cellular. Telegram uses Settings > Data and Storage > Storage Usage > Clear Cache: delete Telegram documents and data. Step-by-step for WhatsApp: how to delete WhatsApp media on iPhone.

Spotify, Apple Music, Netflix, and YouTube

Offline playlists and episodes live in Documents & Data, not in Photos. Delete them inside the app so the account stays: Spotify, Netflix, and YouTube are in how to delete offline downloads on iPhone. Apple Music uses Remove Download: how to delete Apple Music downloads. Offload keeps these files. Turning on Optimize iPhone Storage or running Google Photos Free up space will not shrink them.

Safari and general cache

There is no one-tap “clear all cache” on iPhone. Each app’s files stay inside its own sandbox, so Settings cannot reach in and empty every cache at once, and neither can another app. A cleaner that promises a phone-wide cache wipe is describing something iOS does not allow. How to tell those apart: are iPhone cleaner apps safe.

Safari is the cache you can clear from Settings. On iOS 18 and later: Settings → Apps → Safari → Clear History and Website Data. On iOS 17 and earlier, Safari sits in the main Settings list. That removes cached pages, cookies, and history, and signs you out of most sites. Bookmarks and saved passwords stay.

To drop site data and keep history: Settings → Apps → Safari → Advanced → Website Data, then remove sites one by one or tap Remove All Website Data. If ads are what make pages heavy, clearing will not stop them coming back; a content blocker does: how to block ads in Safari.

Downloads are a different pile. Safari saves PDFs, ZIPs, and videos in the Files app (On My iPhone → Downloads). Delete them there, then empty Recently Deleted in Files or the space still counts. Walkthrough: how to delete Safari downloads.

A restart can drop some temporary system files. It will not wipe WhatsApp media, Spotify downloads, or a social app’s cache. If the gray System Data bar is the one that looks stuck, use what System Data is on iPhone. Cache also refills as you browse. The space that stays gone is usually Photos: large videos, screenshots, and compressing keepers.

Chrome

Chrome’s weight sits in Documents & Data: cached images and files, site data, and downloads. Clearing Safari does not shrink Chrome. They are separate sandboxes.

Do this before a deep clear or Delete App if anything still matters: confirm you are signed into the Google Account that holds bookmarks and passwords, save tabs you still need, and move important Downloads to Files or a computer.

1. Settings → General → iPhone Storage → Chrome. Note App Size vs Documents & Data.
2. In Chrome, tap More (…) → History → Clear Browsing Data. Alternate path: More → Settings → Privacy and security → Clear Browsing Data.
3. Pick a time range. Select Cached Images and Files. Add Cookies, Site Data only if you want a deeper reset — that signs you out of sites. Leave Saved Passwords unchecked unless you mean to remove logins.
4. Tap Clear Browsing Data.
5. Open More → Downloads and delete large files. Check the Files app for leftovers.
6. Recheck iPhone Storage after a minute if the number looks stale.

Cached Images and Files is rebuildable temporary data. History alone is usually small. If Documents & Data stays large after cache and downloads, Offload still keeps the sandbox. Delete App wipes local Chrome data that never synced — confirm Google sync on another device first, then reinstall and sign in.

CapCut

CapCut’s Documents & Data holds drafts, in-app Trash, preview cache, downloaded effects, and imported clips. Exported videos you saved to Camera Roll live in Photos. Clearing CapCut does not delete those Photos copies, and deleting Photos does not shrink CapCut.

Before Clear cache or Delete App, export keeper projects to Photos or Files. If you use CapCut cloud or Space, reopen a backup on another device and confirm it plays. A spinner is not a backup.

1. Settings → General → iPhone Storage → CapCut. Note the two numbers.
2. Delete finished or abandoned projects from the project list.
3. Open CapCut’s in-app Trash and permanently delete what is there. Deleted projects can keep using storage until Trash is emptied.
4. Tap Me (or your profile) → the Settings gear → Clear cache. It is often under Feedback & about, or a Storage / Cache section. Menus move between versions.
5. Recheck iPhone Storage if Documents & Data still looks stale.

Clear cache is for temporary previews and downloads CapCut can fetch again. Remaining drafts should still be there. Delete App wipes local drafts that never left the phone. After CapCut shrinks, Camera Roll exports are a Photos job: compress videos or find large videos, then empty Recently Deleted.

Discord

Discord’s Documents & Data is cached images, GIFs, stickers, video, and voice notes. Servers, DMs, friends, and your account stay in Discord’s cloud. Clearing cache does not delete them. Opening an old attachment may download it again.

Discord’s iPhone menus change often. Look for the intent, not a screenshot from last year.

1. Settings → General → iPhone Storage → Discord. Note App Size vs Documents & Data.
2. In Discord, open your profile, then the Settings gear.
3. Open Advanced and turn on Developer Mode.
4. Go back to Settings and scroll to the bottom.
5. Tap Cache Actions, Clear Caches, or Dev Only Clear Caches (the label varies) and confirm.

If that control is missing or Documents & Data stays large, Offload keeps the sandbox. Delete App wipes local media. Sign back in and your cloud account is intact. Photos only changes if you previously saved Discord media to Camera Roll — those copies stay until you delete them in Photos and empty Recently Deleted.

Instagram, TikTok, and Snapchat

These apps preload feed video, stories, thumbnails, and drafts so the next swipe feels instant. That weight lands in Documents & Data. iOS has no per-app Clear Cache button in Settings. Android does. On iPhone the levers are the control inside the app, or Delete App.

• Snapchat has a Clear Cache control. Open your profile, open the settings gear, and scroll to the account actions near the bottom. Wording moves between releases — search settings for “cache.” Clearing it does not sign you out and does not delete Memories stored in your account. Stories and lenses re-download the next time you open them.
• TikTok has a cache or free-up-space control in its own settings. It clears downloaded feed video and thumbnails. It does not remove videos you posted or anything you exported to Camera Roll. Unposted drafts exist only on the phone. Save those before you clear space or delete the app.
• Instagram on iPhone has no clear-cache button. Account tools for search history and downloaded copies of your information do not shrink Documents & Data. Data-usage and media-quality settings can slow how fast video preloads. The reset is Delete App, then reinstall and sign in.

Offload removes the binary and keeps the cache, so the icon comes back on top of the same files. Delete App removes both. Posts, followers, and chats that live on the company’s servers return when you sign in. Local-only items do not: unposted TikTok drafts, unsent Snaps, unfinished edits. Export those first, and confirm you still have the password and two-factor codes.

The cache grows back, because caching is how a video feed works. Treat it as an occasional job when one app’s row has gotten absurd. Copies you saved to Photos stay after you delete the app. Those are screenshots and videos, and they stay gone once you empty Recently Deleted. Some purgeable cache also shows up in System Data, which is why that bar can move on its own.

Offload vs delete vs delete-and-reinstall

Offload Unused Apps (Settings → General → iPhone Storage → Offload Unused Apps, or Offload App on one app) removes App Size only. Documents & Data stays. Use it when the binary is large and you rarely open the app. Full comparison: offload unused apps vs delete.

Delete-and-reinstall is the nuclear in-app reset: Delete App, then download it again. The sandbox starts empty. Warn: anything not in iCloud or the app’s cloud backup is gone — local chats, offline files, unsynced drafts. Confirm a backup first. Then reinstall from the App Store.

What Will Not Shrink Documents & Data

These are real storage wins elsewhere. They do not touch an app’s sandbox:

• Emptying Photos Recently Deleted. That only frees photos and videos still counting in Photos. It will not drop WhatsApp or Spotify. See how to empty Recently Deleted when Photos is the bar that will not move.
• Compressing videos in Photos. Smaller Camera Roll files. Documents & Data for other apps stays the same.
• Restarting the phone. May trim a little cache. Will not delete chat media or offline music.
• Offloading the app when Documents & Data is the large number. You already know why.
• Optimize iPhone Storage, or Google Photos Free up space. Both only change Photos. If the phone is still full, the sandbox may be the row that did not move.

The same two numbers are the storage check when you are helping a parent or when an old iPhone a child uses fills up with a game or a downloaded show.

If the phone is full and you want to keep memories, pair sandbox cleanup with freeing storage without deleting keepers — offload, compress, caches — instead of wiping the camera roll first.

Where Phone Diet: Clean Up Storage Helps

Phone Diet: Clean Up Storage (App Store id 6748653777 — not Cleanup by Codeway, not CleanMyPhone by MacPaw) does not clear per-app Documents & Data. iOS does not let third-party apps empty another app’s sandbox. WhatsApp media, Spotify downloads, and Safari files stay in Settings and those apps.

Where it helps after you shrink Documents & Data is the Photos side of a full phone: duplicates, similar shots, screenshots, and oversized videos, all scanned on-device. Photos never leave the phone. Deletions go to a 30-day undo vault.

• On-device Photos cleanup — duplicates, similar, screenshots, large videos.
• 30-day undo vault on everything the app deletes.
• Does not wipe Documents & Data / Music / system files — those stay in Settings and the apps that own them.

Start at cleanupmyphone.com when Photos is the next bar after the sandbox.

Frequently Asked Questions

Does Offload Unused Apps clear Documents & Data?

No. Offload keeps Documents & Data so your files return when you tap the icon. If that number is the large one, clean inside the app or delete the app (and accept local data loss).

Does restarting the iPhone help?

A restart can drop a little temporary cache. It will not wipe WhatsApp videos, Spotify downloads, or Safari files. Clean in-app first; reboot after if the storage list looks stale.

Will reinstalling lose my chats?

It can. Delete App wipes the sandbox. Chats and files that never synced to iCloud or the app’s cloud are gone. Confirm a backup before you delete. Offload does not delete chats.

Can Phone Diet: Clean Up Storage wipe Documents & Data?

apps.apple.com/app/id6748653777 Phone Diet runs on iPhone and iPad (iOS 17.0 or later, or iPadOS 17.0 or later). Similar Photos groups near-identical shots and marks the best one 'Keep'. Duplicates are exact copies. It also finds blurry and dark photos, screenshots, screen recordings, Live Photos, and bursts, and it lists Largest Files. Photos never leave the device. Video compression uses HEVC and can make a video up to 70% smaller. Undo has a countdown, and Recover keeps removed items for 30 days, or 7 or 60. Smart Albums and swipe to sort are included. The full scan is free, and the first cleanup of up to 1 GB is free. It cannot empty another app’s sandbox. Not Cleanup by Codeway. Not CleanMyPhone by MacPaw.

Can I clear all cache on iPhone with one tap?

No. Each app’s cache stays in its own sandbox. Clear Safari from Settings, then use the in-app steps above for Chrome, CapCut, Discord, Snapchat, and TikTok. Instagram has no cache button on iPhone — Delete App is the reset.

How do I clear Chrome cache without losing passwords?

In Clear Browsing Data, select Cached Images and Files and leave Saved Passwords unchecked. Cookies and Site Data signs you out of sites. Then clean Downloads. Bookmarks synced to Google return after you sign in.

Does clearing CapCut cache delete my projects?

Clear cache is for temporary previews and downloads. Empty CapCut Trash as well — deleted projects can keep using storage until Trash is cleared. Delete App wipes local drafts. Export keepers first.

Does clearing Discord cache delete servers or DMs?

No. Clear Caches removes local media on the phone. Servers, DMs, and your account stay in Discord’s cloud. Turn on Developer Mode, then look at the bottom of Discord Settings for the cache control.

Can I clear Instagram’s cache on iPhone?

Not from inside Instagram. The iOS app has no clear-cache button. Snapchat and TikTok do. For Instagram, Settings → General → iPhone Storage → Instagram → Delete App, then reinstall and sign in. Offload keeps Documents & Data. The cache refills as you scroll.