How to Find and Merge Duplicate Photos in Apple Photos on Mac

Over years of importing camera rolls, saving messaging attachments, and synchronising via iCloud, image libraries inevitably accumulate redundant duplicate photographs and video clips. These duplicates waste valuable solid-state storage and clutter photo albums. The native Photos application in macOS features an integrated Duplicates detection album powered by on-device computer vision that automatically identifies identical and near-identical media, allowing you to merge them into a single high-resolution file while combining their metadata.

How Duplicate Merging Operates in Apple Photos

The native merging mechanism in macOS does not simply delete one photo at random. Instead, it intelligently amalgamates the best attributes of both files:

• Lossless Quality Preservation: The algorithm identifies and retains the version with the highest resolution, highest bit depth, dynamic range, and overall visual quality.
• Metadata Consolidation: Captions, keywords, star ratings, face tags, favourite statuses, and location coordinates from all duplicate copies are merged into the single retained master file.
• Smart Album Updates: If one copy was assigned to Album X and another to Album Y, the final merged photograph will properly appear in both albums.
• Reversible Deletion: Redundant lower-quality copies are safely moved to the Recently Deleted album, where they remain recoverable for 30 days before permanent purging.

Step 1: Locate the Duplicates Album in Photos

To inspect duplicates detected by macOS on your Mac:

1. Launch the Photos application on your Mac.
2. In the left-hand navigation sidebar, look under the Photos or Library section.
3. Click on Duplicates.
4. Note: If you recently upgraded macOS or imported a massive batch of thousands of photos, the Duplicates album may take some time to appear. Photos scans for duplicate media in the background while your Mac is connected to power and locked or idle.

Step 2: Review and Merge Individual Duplicate Pairs

For fine-grained control over specific images:

1. Browse through the Duplicates view. Each group shows thumbnail previews of matching items alongside their file formats, dates, and file sizes.
2. Select a duplicate set to inspect the details.
3. Click the Merge [X] Items button located in the upper-right corner above the thumbnails.
4. In the confirmation prompt, click Merge [X] Exact Copies (or Merge [X] Items).
5. Photos will instantly synthesize the metadata, keep the highest quality master image, and move the redundant copies to Recently Deleted.

Step 3: Batch Merge All Duplicate Photos at Once

If you have hundreds of duplicate sets and wish to reclaim storage immediately without reviewing every individual match:

1. Inside the Duplicates album, select all duplicate groups by pressing Command + A.
2. Notice that the top-right button now reads Merge [Total] Items.
3. Click the Merge Items button.
4. A dialogue box will ask for confirmation:
   • If all items are byte-for-byte identical, click Merge Exact Copies.
   • If the selection contains slight variations (such as cropped copies or edited versions alongside originals), click Merge [X] Items to retain the highest-resolution versions and consolidate all metadata tags.

Step 4: Permanently Free Up Disk Space

Merged duplicates are initially held in the Recently Deleted container:

1. Click Recently Deleted in the left sidebar.
2. Authenticate with Touch ID or your Mac login password if prompted.
3. Review the deleted files. If satisfied, click Delete All in the top-right corner to permanently wipe the files and reclaim physical drive storage immediately.

Regularly reviewing the Duplicates album in Apple Photos keeps your personal and professional media libraries organised, streamlined, and free of wasted gigabytes.