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Error messageThis alert concerns iPhone storage, not your iCloud quota. Choose what to inspect by the category taking space; a large number does not identify content safe to delete.

iPhone shows Storage Almost Full

Storage Almost Full

Identify local storage use and distinguish offloading an app while retaining data from deleting it with its data.

Try this first

1 quick checks · ~3 min

  1. Measure which category needs attentionCompare categories before choosing what to remove.

Find your situation

See all the clues. Choose the one that matches what you observe.

Apps and their data dominate

Compare program size with documents and data before offloading.

Photos and videos dominate

Verify sync and copies before optimizing; deletion can propagate to iCloud.

Messages or attachments dominate

Review specific attachments with precautions before deleting entire conversations.

Offline downloads dominate

Find downloads in the app managing them; separate recoverable copies from unique files.

System or Other dominates

There is no universal safe purge here: compare the category before deleting personal content.

Diagnostic signals

ObservationDocuments & Data exceeds app size
Offload preserves that data: removing a small program will not solve a category dominated by documents.
ObservationiCloud has space but iPhone does not
These are different capacities. Available cloud space does not mean originals have synced or automatically free local space.

Step-by-step solutions

01

Measure which category needs attention

  • Estimated time: 3 min
  • Easy
  • Low risk

Compare categories before choosing what to remove.

  1. Wait for the breakdown and record free space and the dominant category. Open large apps to compare app size with documents and data.

    1. Settings
    2. General
    3. iPhone Storage

  2. Choose the branch able to free a meaningful amount. If an update or download needs room, use that operation’s stated requirement, not a universal target. Read recommendations without enabling automatic deletions yet.

  3. After each change, return here and check whether the category shrank and the original operation works. Stop when enough space is available: you do not need to empty every category.

Sources:
02

Distinguish the program from documents and data

  • Estimated time: 8 min
  • Easy
  • Low risk

  1. If an app you do not currently need has a large app size, Offload App can reclaim that space while retaining documents and data. First confirm it remains available in App Store for your account and iOS version.

  2. In that app’s storage details, choose only the option that retains documents and data, not Delete App. You must reinstall the program to use it. Check how much space returned before offloading another app.

  3. If Documents & Data takes almost all the space, this action frees little by design. Review downloads or documents inside the app. If it offers no safe way to export and manage them, ask the developer: deleting it can erase local content and is not a harmless test.

Sources:
03

Verify originals before optimizing Photos

  • Estimated time: 10 min
  • Easy
  • Low risk

  1. If Photos dominates, check whether iCloud Photos is on and syncing has completed. Open important photos in iCloud or another device to verify access to originals; an enabled switch alone does not establish a complete copy.

  2. With enough iCloud space and syncing available, Optimize iPhone Storage keeps originals in iCloud and smaller local copies when needed. It does not promise an immediate amount of free space.

    1. Settings
    2. Your name
    3. iCloud
    4. Photos

  3. If you do not want iCloud or lack capacity, first export originals to your own computer or storage and verify they open. Do not delete photos to force optimization: with iCloud Photos, deleting on iPhone also deletes on synced devices.

  4. If already optimized, inspect sync status before repeating settings changes. If originals are missing or sync errors exist, stop and resolve that with Apple before deleting.

Sources:
04

Interpret System or Other without promising a purge

  • Estimated time: 5 min
  • Easy
  • Low risk

  1. System includes the operating system; Other can include indexes, logs and caches that are not managed like photos or apps. The name or size alone does not prove corruption.

  2. When comparing Finder or Apple Devices, remember their categories group caches differently. Use the iPhone’s breakdown for decisions; a difference between views does not prove duplicate files.

  3. If other categories lack enough recoverable content and this usage prevents work, record model, version and screenshots without private data for Apple. Do not install cleaners or remove essential apps to chase a number. A reset is not part of this guide.

Sources:
Advanced

Advanced checks

Continue if the earlier steps did not help. Read each procedure’s precautions first.

05

Remove only downloads you can recover

  • Estimated time: 10 min
  • Intermediate
  • Moderate risk
  • Data loss: Possible

  1. If media or an app’s data dominates, open its downloads section: videos, music, podcasts or maps may have offline copies. Verify content remains available and the button removes the download, not the whole library or account.

  2. Files saved in On My iPhone can be unique originals, not cache. Export them and verify the copy before deletion. In synced locations, check the button’s effect: deletion may propagate; do not assume it only removes a local copy.

  3. Remove a reviewed set and check storage. If the number does not change as expected, check which location you managed and whether content downloads again automatically. Do not repeat blind deletions or change app-wide settings without understanding their effects.

Sources:
06

Review specific attachments before deleting conversations

  • Estimated time: 10 min
  • Intermediate
  • Moderate risk
  • Data loss: Possible

  1. If Messages dominates, review storage recommendations offered by iPhone. To inspect a conversation, open it in Messages and tap the contact or group; review available attachment categories.

  2. Save important attachments outside the conversation and verify the copy. Select only items no longer needed: you can also touch and hold an attachment, choose More and select items to delete. There is no need to erase the entire conversation.

  3. Check recovered space. Recently Deleted can retain content for a time; do not routinely empty it. Do not change Keep Messages to a short period merely as a test: it causes future automatic deletions. If content is needed, stop and look for space in another category.

Sources:
Next step

Still not working?

If usage remains abnormal or you cannot free enough without losing data, give Apple the breakdown, before/after space and actions taken. Distinguish device and iCloud storage and whether unmanageable data dominates. Keep backups; do not use cleaners, mass deletion or resets as an automatic next step.

Sources

Documentation behind this guide. Editorial recommendations are identified separately.

Source review: . A documentation review, not a physical hardware test.

Related problems

mobile
Problem

iPhone app won't open or keeps crashing

One app fails to open or closes unexpectedly. Try reopening and updating before deleting an app that may hold local data.

View solution