Your Mac Photos library is too big — here's how to trim it
A bloated Photos library eats your disk and iCloud quota. Here's how to find the bulk and remove duplicates safely.
Photos libraries grow until they swallow your free space. A few iPhones’ worth of HEICs and 4K videos pushes most libraries past 200 GB, and if you’ve been a photographer for any length of time, multiples of that. Before you buy a bigger SSD, see what’s actually in there.
What’s making it big
Right-click your Photos library (usually in ~/Pictures/Photos Library.photoslibrary), choose Get Info, and note the size. Then:
- Open Photos.
- View > Show Sidebar (if hidden).
- Under Media Types in the sidebar, look at Videos, Live Photos, Bursts, and Selfies. Videos are usually the single biggest category by size.
- Under Utilities, click Duplicates if it’s present. This shows duplicates Photos detected within the library itself.
- Merge duplicates Photos has flagged.
Step 4 catches obvious in-library dupes. It misses photos and videos that exist outside the library but should have been merged in (loose folders of iPhone dumps, AirDrop receipts, Image Capture exports).
Trim duplicates outside the library
A lot of “Photos library is too big” problems are actually “duplicates of library photos exist in other folders, and now I’m storing each shot twice.”
- Install Dupe and open it.
- Click “Add Folder” and add both the Photos library (Dupe scans inside the bundle) and any other folders where photos and videos live — Desktop, Downloads, old iPhone dump folders, external drives.
- Click “Scan.”
- Review duplicate groups. Photos with paths inside the Photos library bundle should be kept; copies in random Finder folders are usually safe to remove.
- Move external copies to the Trash.
Other things that help
- Turn on iCloud Photos with “Optimize Mac Storage.” macOS will keep originals in iCloud and store lightweight versions locally. Your library directory shrinks dramatically.
- Delete videos individually inside Photos. A handful of 4K clips often dominates library size.
- Run the in-Photos Duplicates album under Utilities.
Safety
- Dupe moves files to the Trash only. 30 days to recover.
- The Photos.app system database files are excluded automatically. Dupe won’t touch the index that Photos relies on.
- Byte-identical matching means an original RAW and an edited JPEG are not lumped together.
- Hidden folders are skipped.
Trimming external duplicates plus running the in-Photos Duplicates album typically gets a bloated library down by 30–50%.
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