First, see what’s actually using your storage
Open Settings › General › iPhone Storage. The colored bar at the top breaks your usage down by category — Photos, Apps, Media, Messages, System Data — and iOS lists personalized recommendations right underneath it. On most phones Photos is the single biggest slice, often by a wide margin.
Don’t start deleting in a panic. Knowing whether the real weight is photos, video, apps or “System Data” tells you where the gigabytes actually live. Tap the Photos row and you’ll see how much it holds; tap an app and iOS shows its app size versus its “Documents & Data.” Deleting three small apps won’t rescue a phone where 40 GB is video.
What iOS recommends — and what to skip
The recommendations list is genuinely useful, but not every item is worth tapping. Here’s how the common ones stack up:
| Recommendation | What it does | Worth it? |
|---|---|---|
| Review Personal Videos | Lists your largest videos so you can delete the heaviest first | Yes — fastest GB per tap |
| Review Large Attachments | Surfaces big photos & videos sent in Messages | Yes — easy wins |
| Offload Unused Apps | Removes the app but keeps its data, reinstalls on demand | Sometimes — reversible |
| Optimize iPhone Storage (Photos) | Keeps full-res in iCloud, lighter copies on device | Buys room, not real cleanup |
Treat the list as a map, not a to-do. The video and attachment reviews are the quickest gigabytes you’ll ever reclaim; the photo library itself usually needs a proper pass, which is the rest of this guide.
Clear photos the safe way
In Photos, anything you delete moves to Photos › Albums › Recently Deleted, where it stays recoverable for 30 days before iOS removes it for good. That means deleting is reversible — but it also means the space isn’t freed until those 30 days pass or you empty Recently Deleted yourself.
So the order matters. First, mark the shots you love as Favorites so you can never trash them by accident. Then delete the obvious waste. Finally, when you’re confident, open Recently Deleted, tap Select › Delete All, and the space comes back immediately. Don’t rush that last step — those 30 days are your safety net.
Tackle the heavy stuff first, in this order
Deleting 500 small photos frees less space than deleting two 4K videos. Work biggest-bang-first instead of scrolling chronologically:
1. Long videos and screen recordings. A few minutes of 4K can be a gigabyte each. These are almost always your single biggest win, and the “Review Personal Videos” list hands them to you sorted by size.
2. Photos saved from other apps. Memes, receipts, forwarded screenshots and download folders quietly add up to gigabytes you’ll never look at again. Large Messages attachments fall here too.
3. Screenshots. Most people accumulate hundreds. The Photos app has a Screenshots album (Albums › Media Types) so you can review them in one place.
4. Near-duplicate bursts. You took nine versions of the same shot to get one good one. Keep the best, drop the rest — this is where a surprising amount of space hides.
5. Blurry and accidental shots. Pocket photos, motion-blur misses and the occasional black frame. Small individually, but easy to clear in bulk.
iOS 16 and later also has a built-in Duplicates finder under Photos › Albums › Utilities. It catches exact and near-identical copies and offers to merge them, keeping the highest quality version. It’s free and worth running — just know it only catches true duplicates, not the messy bursts and lookalikes that make up most of a real backlog.
Use iCloud and Optimize Storage wisely
Turning on iCloud Photos with Optimize iPhone Storage keeps full-resolution originals in iCloud and lighter versions on the phone. It buys breathing room, but it’s storage management, not cleanup — your library still grows, and you may end up paying for more iCloud over time.
Important: with iCloud Photos on, deleting a photo on your iPhone deletes it everywhere. Recently Deleted still protects you for 30 days across the account, but treat each sync as real. Review before you confirm, especially when you’re clearing in bulk.
“Storage Almost Full” when the numbers don’t add up
Sometimes the category bar doesn’t seem to total your capacity, and a big purple System Data block (formerly “Other”) eats space you can’t obviously reclaim. That bucket holds caches, logs, Siri voices, streamed media and temporary files. You can’t delete it directly, and you shouldn’t obsess over it — iOS trims it automatically when the disk gets tight.
If System Data looks bloated, the reliable fixes are mundane: clear Safari history and website data, delete and reinstall a heavy app whose cache has ballooned, and restart the phone so iOS can flush temporary files. None of that touches your photos, which is where the recoverable gigabytes really are.
Do the math before you scroll
It’s easy to spend an hour deleting and free almost nothing, because effort and space saved aren’t the same thing. A quick sense of scale keeps you honest:
| What you delete | Rough space freed |
|---|---|
| One minute of 4K video | ~350 MB |
| A 30-second screen recording | ~60 MB |
| One photo (HEIC) | ~2–4 MB |
| One screenshot | ~0.5–3 MB |
The lesson is blunt: a single long video can outweigh a thousand screenshots. Start at the top of that table and work down, and you’ll feel the storage number move within minutes instead of grinding through your whole library.
Stop the camera roll from filling so fast
Cleaning up matters most when new clutter slows down. A few one-time settings help. In Settings › Camera › Formats, choose High Efficiency so photos save as HEIC and video as HEVC — roughly half the size of JPEG and H.264 at the same quality. If you shoot 4K, dropping to 1080p at 30 fps for everyday clips saves enormous space, and most people can’t tell the difference on a phone screen.
Live Photos are worth a thought too: each one stores a short video alongside the still, so it’s heavier than a normal photo. You don’t have to turn them off, but the motion clip is the first thing to drop on a shot you only want for the frame. And if you use burst mode, remember every press can save ten or more frames at once — the camera is generous, so the cleanup has to be deliberate.
Why a focused tool speeds this up
Cleaning by hand is free and always will be — but reviewing a library of tens of thousands one by one takes hours, and tired eyes make mistakes. The real bottleneck isn’t the deleting, it’s the deciding: which of these nine burst frames is best, is this shot blurry or just soft, will I ever rewatch this clip?
Kept pulls those decisions to the front. It scans your library on-device, shows each category with the space it would free, and lines up lookalikes and bursts side by side so you just confirm. It learns as you correct its guesses, so over time you hand-sort less. Clean by person gathers every photo of one person in one place — faces matched on-device, nothing leaving the phone — so you can review them together. Nothing is ever deleted without your confirmation.
Make it a habit, not a once-a-year panic
A camera roll fills up constantly, so a single heroic cleanup never lasts. A few minutes every week or two beats a dreaded annual purge — and it’s far less likely to end in a delete you regret. Catch the bursts and screenshots while there are dozens, not thousands.
This is exactly what Kept is built for. It scans your library entirely on your iPhone — nothing is uploaded, there’s no account or login — and pre-judges each photo (“keep — best of 9” / “trash — blurry duplicate”). You confirm with a swipe, it learns your taste as you go, and every delete routes through Recently Deleted, so it’s reversible for 30 days. Cleaning by hand is free forever; Pro is optional, the price is shown on the App Store first, and there’s no trial that quietly auto-bills.