Nobody plans to have 20,000 photos. It just happens, one burst and one screenshot at a time, until the day your iPhone refuses to record a video because storage is full.
The Photos app technically supports bulk deletion. In practice, it fights you the whole way. Here's what actually works.
The built-in way (fine for hundreds, painful for thousands)
In Photos, tap Select in the top right, then drag your finger across the grid instead of tapping photos one by one. The drag-select is the single most underused feature in the app: swipe across a row, then down, and you select entire screens at once.
The problems appear at scale. Thumbnails are small, so you'll select keepers by accident. There's no undo for a deselection mistake. And the grid gives you no context: was that blurry photo the only shot of that dinner, or one of nine?
The sort-by-size trick nobody uses
Videos are where your storage actually went. One minute of 4K video weighs more than a hundred photos. In recent iOS versions, open Photos, search for "videos", and review the longest ones first. Deleting three forgotten screen recordings often frees more space than an afternoon of photo triage.
The swipe method
The reason swipe-based cleaners exist is that a full-screen photo with a binary choice is the fastest review interface humans have found. You see one photo, large. Left means bin, right means keep. No checkbox, no zooming into thumbnails, no fear of a stray tap deleting something you never saw.
The good ones add three safety layers: every decision is reversible with undo, everything you binned waits in a review pile you check before anything is deleted, and the actual deletion happens as one batch with one confirmation, not two hundred popups.
That's the model Sweep follows, with one addition the others skip: after you delete, it walks you through emptying Recently Deleted and then measures your real free space, because photos you "delete" on iPhone keep using storage for 30 days unless you finish the job.
A realistic strategy for a 20,000-photo library
- Videos first, longest first. Biggest wins, fewest decisions.
- Screenshots second. Hundreds of them, almost all safe to bin, review takes minutes.
- Bursts and rapid sequences. Twelve near-identical shots of the same sunset: keep one.
- Then by month, oldest first, ten minutes at a time. Progress you can feel, without the burnout.