Overview
'Storage Almost Full' blocks updates, photos and backups — but you can usually reclaim gigabytes in minutes. This guide shows you how to see exactly what's using space, then clear the biggest offenders (photos, messages, app caches) without losing anything you care about.
Symptoms you might see
- A 'Storage Almost Full' warning keeps appearing.
- You can't take photos, install apps or update iOS.
- Apps crash or fail to save data.
- iCloud backups fail to complete.
Possible causes
- Photos and videos consuming most of the storage.
- Large apps and their cached data.
- Old message attachments and downloads piling up.
- 'Other'/System data growing with caches and logs.
- A device with limited base storage that fills quickly.
Step-by-step troubleshooting
Work through these in order — the earliest steps are the safest and fix the most cases.
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See what is using space
Go to Settings › General › iPhone Storage. The bar and per-app list show your biggest consumers, and iOS offers tailored recommendations at the top. Start with whatever is largest.
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Offload unused apps
Tap a large app and choose 'Offload App' to remove the app while keeping its documents and data, so you can reinstall later without losing anything. Enable Settings › App Store › Offload Unused Apps to automate this.
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Clear out photos and videos
Videos are storage-heavy. Delete unwanted clips, review the Recently Deleted album (it holds files for up to 30 days), and consider iCloud Photos with 'Optimise iPhone Storage' to keep full-resolution copies in the cloud.
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Trim message attachments
In iPhone Storage, tap Messages to delete large photo, video and GIF attachments. Set Settings › Messages › Keep Messages to 30 Days or 1 Year to auto-remove old threads.
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Clear browser and app caches
Clear your browser history and website data, and offload apps that hoard caches (streaming and social apps especially). Reinstalling a bloated app resets its cache.
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Remove downloads you no longer need
Delete downloaded music, podcasts, offline maps and videos. These are easy to re-download and often take large amounts of space.
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Restart to clear temporary files
A restart lets iOS clear some temporary and 'System Data' files. If System Data is unusually large, updating iOS can also help reset it.
Before you go further: back up your iPhone to iCloud or a computer whenever possible. Steps that could affect your data are clearly flagged — and for suspected hardware faults, a qualified repair professional is the safest next step.
Prevention tips
- Enable iCloud Photos with 'Optimise iPhone Storage'.
- Turn on Offload Unused Apps.
- Set Messages to auto-delete after 30 days or 1 year.
- Review iPhone Storage monthly and clear the biggest items.
Frequently asked questions
What is 'System Data' or 'Other' storage?
It's caches, logs and temporary files iOS creates. It grows and shrinks automatically. Restarting and updating iOS usually keeps it in check; you can't delete it directly.
Will offloading an app delete my data?
No. Offloading removes the app but keeps its documents and data. Reinstalling restores everything. Deleting an app removes its data too.
Related guides
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