Optimize iPhone Storage Savings Calculator

What Optimize iPhone Storage does to your photos

The setting sits in Settings, then Photos, and it does nothing unless iCloud Photos is on. Apple's own description: full-resolution photos and videos live in iCloud, and "when needed", space-saving copies are kept on your device. Tap a photo, the original downloads on demand.

Two phrases in there do most of the work. "When needed" means iOS offloads when it feels like it: under storage pressure, on Wi-Fi, on power. The free space shows up over hours or days, not the second you flip the toggle. And "stored in iCloud" means the full-resolution library never gets any smaller. Optimizing is a device storage feature and nothing else. Your iCloud usage and your bill do not move.

Nothing gets deleted along the way, and nothing is lost if you turn it off. Switch back to Download and Keep Originals and iOS starts pulling the originals down again, which means finding room for the whole library on the phone.

How much space it typically frees

Apple publishes no percentage, so every number on this page comes from third-party measurements. They cluster in a wide band, 50 to 90%, and the spread is mostly about video. An optimized preview of a 1.5 GB 4K clip can come down to 50 to 100 MB, a cut of 93% or more, while a still photo shrinks nowhere near as hard. So video-heavy libraries optimize best, which is the same thing the Video Storage Calculator shows from the other side.

The 80% default sits in the middle of the credible range. Reported cases include a 50 GB library settling at 5 to 10 GB resident, and a 140 GB video-heavy library at roughly 5 GB. Any single figure here is an estimate with a wide error bar, which is why the sensitivity table further up shows three rates instead of one.

The iCloud+ bill nobody mentions

Optimizing needs the whole library sitting in iCloud, so it can quietly hand you a subscription you did not have before. Once backups, Drive and Mail are counted, almost any library over about 5 GB blows past the free tier. From there the ladder looks like this at 2026 US pricing:

Apple bills monthly only, so the yearly figure is twelve times the monthly one. Watch the step from 200 GB to 2 TB: capacity goes up about ten times while the price goes up 3.3 times, so staying under the 200 GB ceiling is worth $84 a year. The upgrade verdict above is just the smallest tier that covers your library plus your other iCloud data, checked against the plan you are on now.

Optimize or clean up: which one you need

The decision is easier than it looks. Device full, iCloud fine? Optimize. iCloud full, or the bill climbing? Optimizing will not help at all, because the full-resolution library is what is filling the plan. Both at once? Optimize for the quick device win, then delete for the cloud side. Deleting is the only move that shrinks both.

What comes out is almost always the same stuff: near-identical burst runs, screenshots of things you dealt with months ago, videos nobody has watched twice. Dead weight on the phone, and dead weight on the bill.

That is the job Swipe44 does. You swipe through the camera roll, right to keep and left to delete, working from Recents, Random or one month at a time so it never turns into a single giant chore. Duplicates get hashed on the phone and grouped for review. Everything you mark piles up and goes in one batch behind one system confirmation, with a tally of the space you got back. It reads thumbnails and never pulls down iCloud-offloaded originals, which matters if Optimize is already on.

If the goal is still out of reach after both, the honest answer might be more storage on the next phone. The iPhone Storage Size Calculator and the Phone Storage Planner price that path out.