Photos Library Taking Up Space on a Mac: What to Do
The Photos library is usually the single largest personal item on a Mac. The honest fixes: turn on iCloud Photos with Optimise Mac Storage (full-res in the cloud, lighter copies locally), move the library to an external SSD, and remove duplicates. Don't delete inside the .photoslibrary package by hand — manage it through Photos. Photo caches can be cleared separately.
Why it's the biggest thing on your Mac
Years of high-res photos and 4K video add up fast — a Photos library of 50–200GB is common. It's personal data, so the goal isn't to delete it, it's to store it smarter.
The right ways to shrink its footprint
- iCloud Photos + Optimise Mac Storage (Photos → Settings → iCloud) — keeps originals in the cloud and lightweight versions locally. The biggest, safest win.
- Move the library to an external SSD — hold Option when opening Photos to pick its location.
- Remove duplicates — Photos → Duplicates album merges them.
.photoslibrary package in Finder — you can corrupt the library. Always manage photos through the Photos app.The part a cleaner can safely help with
MacCleaner doesn't manage your photos — that's Photos' job — but it shows the library's footprint in context and safely clears the caches Photos builds, plus everything else rebuildable on your Mac. For the library itself, use iCloud and offloading above; see also finding large files.
Frequently asked questions
Why is my Photos library so big on my Mac?
High-res photos and 4K video accumulate over years, easily reaching 50–200GB. Use iCloud Photos with Optimise Mac Storage or move the library to an external SSD to shrink the local footprint.
Can I delete files inside the Photos library to save space?
No — never edit the .photoslibrary package in Finder; it can corrupt your library. Manage photos through the Photos app, and use iCloud/offloading to reduce the local size.
How do I move my Photos library to an external drive?
Quit Photos, copy the .photoslibrary to the external SSD, then hold Option while opening Photos and choose the library in its new location.
Reclaim the space in two taps
MacCleaner scans read-only, shows every file before anything is touched, marks the safe groups, and lets you choose Trash or permanent. Free for up to 500 MB of cleanup a day.
Download for Mac