DiskLens › How to free up space on Mac
How to Free Up Space on Mac
The internet's usual advice is a laundry list. This is an order of operations: start at the top where the gigabytes are, work down only if you still need more.
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1. Old installers in ~/Downloads (5–15 GB)
Every .dmg and .pkg you ever downloaded is still there. The app you installed doesn't need it — delete every installer older than a month and you'll likely clear more space than everything else on this page combined.
2. Developer caches (5–50 GB if you write code)
node_modules in every project, Xcode DerivedData, Gradle caches, Python virtualenvs — all regenerable, all huge. A single old Xcode project can hold 10 GB of build output. Delete freely; the tools rebuild what they need.
3. Empty the Trash and check iOS backups (2–10 GB)
Trashed files still count against your disk until you empty it. Then check System Settings → Storage → iOS Backups: backups of devices you no longer own are pure reclaim.
4. Duplicate videos and projects (3–30 GB)
"Grand Canyon.mov" and "Grand Canyon copy.mov". The duplicate finder flags same-name-same-size groups instantly — keep one of each.
5. Old device and archive backups (10–50 GB)
That 2023 macbook backup tar and last year's iPhone zip in ~/Backups belong on an external drive or cloud, not your working disk. Move, don't delete — see the AI plan's "back up first" list.
6. Browser caches and logs (1–5 GB)
Chrome can cache gigabytes per profile. Clearing app caches is safe; apps rebuild them slowly, so expect slightly slower first loads after.
7. Photos: offload, don't delete
4K video is ~350 MB per minute. If Photos is your biggest folder, the answer is iCloud/external storage, not deletion — this is a back-up problem disguised as a cleanup problem.
8. Leave System Data alone
macOS manages it and reclaims under pressure. If it's huge, our System Data guide covers the few safe levers (local snapshots, old backups, per-app caches).
Do it in one pass
Every category above lives in folders you can scan in one go: map your home folder with DiskLens, work the biggest red blocks first, export a reviewed cleanup script, and you're done in fifteen minutes instead of an afternoon.
Frequently asked questions
How do I free up space on my Mac fast?
Delete old installers and developer caches first — regenerable, huge, zero risk. One scan with DiskLens names them all.
Is it safe to delete caches on a Mac?
App caches and build output are designed to be rebuilt. Never touch /System or /Library system folders.
How much space can I free?
First cleanup on a never-cleaned Mac: typically 10–40 GB across installers, caches, duplicates and old backups.