A photo cleanup can have two very different goals: removing unwanted photographs from the library, or using less space on a device while keeping the library. Decide which one you mean. The first changes the collection; the second should begin with storage and download settings.
Check whether the library is synchronized
Open the device’s iCloud Photos settings and inspect the library status in Photos. The exact placement varies by software version. If iCloud Photos is enabled, edits and deletions can propagate to other devices using the same library.
Do not treat an old iPad as an archive merely because it shows the same pictures. If it reconnects and synchronizes, it can receive the same deletions. An archive needs to be independent of that shared state.
Begin with an easy-to-review group
Choose a narrow set: accidental screenshots from one task, obviously blurred shots from one outing or duplicate exports from a completed project. Review a small batch rather than swiping through the entire library while distracted.
Duplicates tools, where available, can help identify candidates, but review what the system proposes. Similar photographs are not always interchangeable. One may contain a different expression, crop or moment that matters to you.
Preserve the version you actually want
If you edited a photograph, decide whether your independent copy should contain the original, the edited result or both. A project may need the edited image, while future editing may benefit from the original. A single generic “export” instruction does not answer that choice.
Open exported files outside Photos and inspect a few at full size. Include an edited image and a video if those are part of the batch. A folder full of filenames is not proof that all the expected media copied successfully.
Use optimization for a local-space goal
If you want to keep the whole library, examine Optimize iPhone Storage rather than deleting library items. The full-resolution originals remain in iCloud while local storage is managed. You still need sufficient iCloud capacity and completed synchronization.
Optimization does not promise an immediate exact saving. Give it suitable connectivity and time, and use the device’s storage display to observe the result. Keep room for the work you expect to do offline; retrieving an original may require a network connection.
Leave a recovery margin
Recently Deleted gives a limited opportunity to recover deleted items under Apple’s documented behavior. Do not empty it just to make the storage chart change faster unless you are certain about the selection and your independent copies.
If an important image disappears unexpectedly, stop deleting. Check the correct library, account, filters and Recently Deleted before making further changes. A photograph can be hard to find without having been permanently lost.
Use a 20-item review rather than a blind purge
Create a temporary album for a small selection you want to review. An album organizes references within the library; adding an item to it does not create an independent duplicate. Select twenty obvious cleanup candidates, inspect each at a useful size and remove only the ones you deliberately decide to delete from the library.
Keep two different actions distinct: removing an item from an album can leave it in the library, while deleting it from the library affects the actual collection. Read the confirmation wording before proceeding. If your goal is only to reorganize albums, do not choose a library-wide deletion action.
After this small batch, revisit the library and Recently Deleted using the controls available in your version of Photos. Check one item you intended to keep and one you intended to remove. Only continue when the observed result matches your goal. This limited first batch reduces the impact of misunderstanding the menu.
A workable monthly habit
After a trip or project, review that event as a bounded collection. Keep the images you value, export irreplaceable originals if needed and remove obvious mistakes. This is easier to verify than a yearly purge of thousands of files.
The measure of success is not the smallest library. It is a collection you can navigate and a storage arrangement whose consequences you understand. If you cannot explain where an image will remain after deletion, postpone the deletion.
Sources & further reading
Apple’s documentation supports the feature details. The scenarios and decision sequences above are CJVV’s editorial guidance.