delete duplicate photos automatically
What is the best way to delete duplicate photos automatically?
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There are no facilities in photos to automate this, so either
* manually,
* or using an app designed to work with the photos library (Ie one that marks the photos or puts them in an album, and lets you review and then delete them, rather than doing the delete itself.
Do NOT use a general file duplicate finder not designed to work with the photos library. They will damage your photos library and likely cause loss of your photos.
I personally use PowerPhotos (I also use this for copying images and data between libraries) https://www.fatcatsoftware.com/powerphotos/
Another suitable app recommended by experts here is PhotoSweeper (I have no personal experience of this one)
Both are paid apps.