How to delete duplicate photos?

On macOS 13 Ventura you can let the Photos.app merge duplicates, see: Remove duplicate photos in Photos on Mac - Apple Support (BH)

"You can easily remove duplicate photos and videos from your library. Duplicates appear automatically in the Duplicates album in the sidebar. 

• • In the Photos app  on your Mac, click Duplicates in the sidebar.
  • Select the duplicates you want to merge.

• • Click Merge [number] Duplicates. 
  • One original source photo or video appears where the duplicates were located."

If the photos are having different metadata - titles, descriptions, keyword, I would not use the "Merge" option, but do it like Barney described and merge the metadata myself into the photo I want to keep and then delete the other one manually.

Duplicate photos cannot be merged at this time.

this message keeps coming up when I try to merge more than just a few duplicates...

photos found 13,000 duplicates, but only mergers 50 or so at a time... sometimes more, sometimes less

In the Duplicates, you can select one of the duplicates and delete it like any other photo.

Hi Happy2,

I am also having this problem. Were you ever able to find out why the system was 'unable' to merge?

Appreciated