You open Settings, tap General, tap iPhone Storage. Photos: 22 GB. You stare at it for a second because you haven't been shooting anything particularly interesting — some food, a few screenshots, videos of the dog. Nothing that should add up to 22 gigabytes.
Two things are probably inflating that number. One is a camera setting that ships in the wrong default for anyone who mostly uses Apple devices. The other is the slow accumulation of burst sequences, near-identical shots, and duplicate videos that never get cleaned up. You can fix both without losing anything you actually care about.
Start Here: The Format Setting Makes the Biggest Difference
Go to Settings > Camera > Formats. If it says Most Compatible, your iPhone is saving every photo as JPEG and every video as H.264. These formats open everywhere — Windows, Android, old software, whatever. They're also significantly larger than they need to be.
Switch to High Efficiency. Photos save as HEIF ("heef"), videos as HEVC. Visual quality is identical — you genuinely cannot tell the difference looking at photos on a phone screen. File size drops by roughly half.
Why does Apple ship phones in Most Compatible mode? Because HEIF doesn't open on older systems: Windows 7, Linux image viewers, some web upload forms. If any of those matter to your workflow, stay with JPEG. For everyone else, you're paying a size penalty for compatibility you probably don't need.
One thing to know: this setting only affects photos you take from now on. Existing photos in your library stay in whatever format they were saved in.
| Format | Typical file size | Notes |
|---|---|---|
| JPEG | 3–6 MB per photo | Opens everywhere |
| HEIF | 1.5–3 MB per photo | iOS, macOS, recent Windows |
| H.264 video (4K/30fps) | ~350 MB/min | Opens everywhere |
| HEVC video (4K/30fps) | ~170 MB/min | iOS, macOS, recent Windows |
The video row is worth paying attention to. A 10-minute 4K clip in H.264 is about 3.5 GB. Same recording in HEVC: under 2 GB. If you shoot much video at all, this matters.
Live Photos Are Quietly Doubling Your File Sizes
Every Live Photo is a still image plus a three-second video clip bundled together. It sounds minor. It isn't — each Live Photo is roughly double the file size of a standard photo, and unless you've deliberately turned it off at some point, it's been on for every shot you've ever taken.
Honestly, this is close to a design flaw. Live Photos are genuinely nice for the right moment. But having them on constantly means you're storing a micro-video for every photo of a receipt, a whiteboard, a price tag, or a package barcode. That's most of what people photograph.
In the Camera app, tap the Live Photo icon (the concentric circles at the top) to turn it off. It stays off until you explicitly enable it. Save it for moments that actually move.
The Hidden Culprit: Near-Duplicates and Burst Photos
Here's where most of the mystery storage is hiding.
You held the shutter button down trying to catch a fast-moving subject and generated 30 frames in three seconds. You took the same shot twice because you weren't sure the first one was in focus. iOS has a built-in Duplicates album (in Photos under Utilities) that finds exact matches — same file. It doesn't find near-matches: the burst of almost-identical frames, the two shots of the same thing with slightly different framing.
EverClean AI (free to download on the App Store) runs an on-device scan that groups visually similar photos together and shows you the clusters. You pick the one you want to keep and delete the rest. For most people who've never done this, the savings are somewhere between 3 and 8 GB.
For burst photos specifically: tap a burst in the Photos app, tap Select, choose one frame, and delete everything else. If you've ever held the shutter for more than a second or two, you have bursts in your library. Most are several hundred megabytes of storage sitting there doing nothing.
More on this in How to Delete Duplicate Photos on iPhone.
What iCloud Optimize Storage Actually Does
Settings → [Your Name] → iCloud → Photos → Optimize iPhone Storage.
This replaces full-resolution photos on your device with smaller previews. The originals stay in iCloud. When you open a photo, the original downloads on demand — usually quickly enough that you don't notice.
The tradeoff is real: no internet access means you see previews instead of originals. For people who primarily view photos at home or have reliable data, that's acceptable. For people who regularly look through their library while traveling somewhere remote, it might not be.
What to Do Right Now
The format change helps going forward. For the library you already have:
- Run EverClean AI and review the duplicate and similar photo groups it finds
- Open the Photos Duplicates album and merge any obvious exact matches
- Go through your burst photos (look for the stack icon) and delete all but the best frame
- Empty Recently Deleted — those photos count toward your storage until you do
For large video files specifically, see How to Find and Delete Large Files on iPhone — videos are almost always the biggest individual items and worth auditing separately.
Switching to High Efficiency cuts ongoing storage growth by around 40–50%. A cleanup of near-duplicates and burst sequences on top of that typically recovers 5–10 GB for people who've been shooting for a few years without pruning. The 22 GB problem is very solvable.