Updated: September 24, 2026
iPhone System Data can gradually take up a large amount of storage because of temporary files, caches, logs, and other data created by apps and iOS. You can’t directly delete all System Data with one option, but these 7 methods can help remove unnecessary files and free up storage.
How to Clear iPhone Storage
- Delete unused apps
- Remove large photos and videos
- Clear Safari website data
- Delete large files
- Remove old Messages attachments
- Delete downloaded media
- Restart and update iPhone
The steps below explain how each method can help free up storage on your iPhone.
1. Remove Unused Apps
If you have apps that you no longer use, deleting them can free up storage on your iPhone.
Go to Settings > General > iPhone Storage, select an app you no longer need, and tap Delete App. You can also touch and hold the app on the Home Screen, then tap Remove App > Delete App.
If you want to free up space without deleting the app’s documents and data, choose Offload App instead.
2. Free Up Space From Photos and Videos
Delete duplicate photos and videos, along with screenshots and other unnecessary media. After deleting them, open the Photos app and go to Albums > Utilities > Recently Deleted to permanently remove them and recover the available storage.
If you want to keep your photos and videos, use iCloud Photos with Optimize iPhone Storage. This keeps smaller versions on your iPhone while the full-resolution originals are stored in iCloud.
3. Clean Safari Website Data
Safari stores cached files, cookies, and other website data as you browse. Clearing this data can free up some storage on your iPhone.
Go to Settings > Apps > Safari and tap Clear History and Website Data. To remove only website data, go to Settings > Apps > Safari > Advanced > Website Data and tap Remove All Website Data. Swipe left on individual websites to remove their data.
4. Delete Unused Large Files
Delete large documents, PDFs, ZIP archives, and downloaded files from your iPhone.
Open the Files app, tap Browse, and open On My iPhone or any connected cloud service. If available, use the Sort By option to help find larger files. Select the files you no longer need and tap Delete.
5. Delete Large Message Attachments
Images, videos, voice messages, and GIFs shared in conversations can use your iPhone’s storage. This can become noticeable when many attachments are stored in Messages.
Go to Settings > General > iPhone Storage > Messages. If iOS shows Review Large Attachments, tap it, then tap Edit, select the attachments you want to remove, and tap the trash icon. Depending on your iOS version, you may instead see attachment categories such as Photos, Videos, and GIFs & Stickers under Messages.
Deleting attachments this way removes the selected media while keeping the text conversation intact.
6. Delete Unused Downloaded Media
Remove downloaded movies, music, podcasts, and other files saved through apps or downloaded from the web.
For app downloads, open the app and look for Downloads or Offline in its library or settings. For files downloaded from the web, open the Files app and delete them from the relevant folder.
7. Restart and Update Your iPhone
Restarting your iPhone can refresh the system and may clear some temporary processes.
To update iOS, go to Settings > General > Software Update and install any available update. Keeping iOS updated provides security fixes and system improvements.
Why iPhone Storage Behaves This Way
System Data isn’t a single file you can delete — it’s made up of caches, temporary files, and logs that iOS and your apps create automatically while running. Because of this, System Data can fluctuate over time and even increase again after you’ve cleared it, which is completely normal and doesn’t indicate a problem with your device.
After removing files, photos, or attachments using the methods above, the storage number in Settings may not update instantly. iOS often needs a few minutes, or sometimes a restart, to recalculate and reflect the freed-up space accurately. If your available storage still looks low right after cleanup, give it a little time before checking again.
Since System Data can’t be deleted directly, the goal isn’t to remove it entirely but to reduce the caches and temporary files that make it grow. Restarting your iPhone plays a small role in this process — it clears certain background processes and temporary data, though it works best when combined with the other methods above rather than as a standalone fix.
Conclusion
These methods can help free up more space on your iPhone. Apple also provides further guidance on managing iPhone storage. For more information, see Apple’s official guide to checking iPhone storage.
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