Is there a faster way to remove duplicate photos in Photos on macOS Monterey?

My Photos library on macOS Monterey has started getting pretty cluttered, and I’ve noticed a lot of duplicate pictures showing up over time.
Before I spend hours going through everything manually, I wanted to ask if there’s an easier way to find and remove duplicates in the Photos app on Mac. Does Monterey have any built-in option for this, or is manual cleanup basically the only choice?

Monterey doesn’t include the built-in “Duplicates” feature that Apple added in later versions of macOS, so Photos won’t automatically group duplicates for you there. That’s why a lot of people end up managing them manually or using another method.

If your library isn’t huge, sorting photos by date imported can help a lot. Duplicates usually end up close together, especially after bulk imports from phones or external drives.

Since Monterey doesn’t have native duplicate detection in Photos, I ended up using iBoysoft Cleaner to speed things up.
What I did was:

  1. Install and open the app on my Mac.
  2. Choose the duplicate scanning option.
  3. Select the Photos Library or folders where my images were stored.
  4. Let it scan and group duplicate photos automatically.
  5. Review the matches and remove the extra copies in batches.
    It saved a lot of time compared to checking thousands of photos manually, especially for older libraries that had been imported multiple times.