Merge Duplicate Photos
Your Photos library is bloated with duplicates — the same sunset five times, screenshots saved twice, imports that doubled everything. macOS has a built-in duplicate finder that groups exact copies and merges them safely, keeping the best version and combining the metadata. The bloat shrinks without the risk.
TL;DR / Quick Fix
Quick fix: open Photos, scroll the sidebar to Utilities, and open Duplicates — macOS lists every detected pair. Review and tap Merge for each group; the best copy survives with combined metadata. Back up the library first anyway; merging is safe, but backups are sacred.
Follow these steps
- Open the Duplicates album. Photos app, sidebar, Utilities, Duplicates. macOS scans automatically — the after-import duplicates note explains why imports breed them.
- Review before merging. Skim each group — the detection is good, not infallible. Near-identical bursts are the edge case; keep the sharpest deliberately.
- Merge the groups. Tap Merge; Photos keeps the highest-quality copy and combines captions, keywords, and favorites. One photo, all the metadata — the safe kind of deletion.
- Check the Recently Deleted. Merged originals land in Recently Deleted for 30 days. The space frees when they expire — or empty the album to reclaim it now.
- Prevent future doubles. Import once, from one place. The import duplication pattern — phone plus cable plus cloud — is how libraries double themselves.
- Back up before big merges. Time Machine or a library copy first. Merging is safe; bulk operations deserve a safety net regardless.
What NOT to do
- Do not merge blindly at 2 a.m. A quick review catches the false positives — near-duplicates you wanted to keep.
- Do not delete the Recently Deleted immediately in panic. Let it sit; the safety window is the point.
- Do not use third-party duplicate cleaners first. The built-in merger is free, safe, and surprisingly good.
- Do not forget iCloud syncs the merge. Merged on Mac means merged everywhere — which is what you want, once sure.
Frequently asked questions
Does merging delete photos?
It removes the redundant copies, keeping the best one with combined metadata. The losers sit in Recently Deleted for 30 days.
Why do I have so many duplicates?
Multiple imports of the same photos — cable, cloud, and shared albums each adding their own copies.
Can I undo a merge?
Within 30 days, recover from Recently Deleted. After that, the merge is permanent — hence the backup.