Loose documents — PDFs, zips, scans, and downloads — collect in the iPhone Files app and never clean themselves up. To find the biggest, open Files > Browse > On My iPhone, sort by Size, and delete what you no longer need, then empty Files > Recently Deleted. Files stored only on the device are removed for good once you clear Recently Deleted, so check before deleting.
TL;DR
- The Files app holds PDFs, zips, scans, and downloads that never auto-clean.
- Sort by size: Files > Browse > On My iPhone > sort menu > Size.
- Delete the big, re-downloadable items first (old zips, installers, duplicate scans).
- Empty Files > Recently Deleted to actually free the space.
- iCloud Drive files removed on-device may also leave the cloud if they are not pinned elsewhere.
Where do large files hide on iPhone?
Anything you save outside Photos lands in Files: email attachments you opened, browser downloads, scanned documents, exported zips, and app exports. There is no automatic cleanup, so over time the On My iPhone location accumulates large, forgotten documents.
How to find and delete the largest files
- Open Files > Browse.
- Tap On My iPhone (and check iCloud Drive separately).
- Tap the sort control (top, the ellipsis/menu) and choose Size to list largest-first.
- Delete the obvious big clutter — old zips, installers, duplicate scans, finished downloads.
- Empty Files > Browse > Recently Deleted (tap a file or use Select > Delete All).
What iOS does natively, and where it stops
The Files app sorts by size and has its own Recently Deleted — that covers loose documents well. The limit: Files does not include your Photos library (the usual biggest category), so a clean Files app does not mean a clean phone. Check Photos and the storage list too.
What this cannot do
Once you empty Files Recently Deleted, on-device files are gone unless backed up. For iCloud Drive files, deleting on the phone removes them from the cloud too (they sync), so confirm a backup before clearing important documents.
FAQ
How do I find large files on my iPhone?
Open Files > Browse > On My iPhone, tap the sort menu, and choose Size to list files largest-first. Check iCloud Drive the same way.
How do I delete files to free space on iPhone?
In Files, delete large items you no longer need, then empty Files > Recently Deleted — deletions do not free space until that is cleared.
Why don't deleted files free space immediately?
Deleted files move to the Files app's Recently Deleted and keep using storage until you empty it, similar to deleted photos.
Does the Files app show my photos?
No. Files covers documents and downloads, not your Photos library. Since photos and videos are usually the biggest category, check Photos separately.
Next: how to find the biggest files on iPhone without a Mac and iPhone storage full but nothing to delete. To rank your biggest media too, get Cleanor for iPhone.