What can I safely delete on my Mac? Safe, risky and never

You can remove inspected files you no longer need and old installers. For caches, prefer app controls; only manually clear verified rebuildable contents of known third-party apps after protecting wanted offline or unsynced data and quitting the app. Skip Apple and unknown cache folders. You should be careful with app data in ~/Library. You should never delete system folders or your Photos library by hand.

That is the short version. The rest of this guide gives each common item a label, explains what breaks if it goes, and links to a deeper guide for the folders people ask about most.

How to read the labels

• Safe. The contents are confirmed unwanted or rebuildable, and any wanted offline or unsynced data is preserved. Meet the row’s conditions before removal.
• Risky. The file may hold settings, downloads or work that cannot be rebuilt. Look first, and keep a backup.
• Never. Deleting it can stop macOS or an app from working, or lose data for good. Leave it alone.

Before removing anything in the Risky group, identify its consumers, inspect retained data and verify wanted exports/backups. Move reviewed items to the Trash as an extra recovery option. Restore them if a problem appears; a quiet period does not prove archived work is unnecessary. The Trash guide explains why this does not free space until the Trash is emptied.

The Safe / Risky / Never box

Safe: what to clear first

The Trash. Look through it once, then empty it. This is the step that returns the space.

Old downloads and installers. Open your Downloads folder and sort by size. A disk image you installed from months ago has done its job.

Caches. Prefer the app’s own cache-control option. For manual removal, identify a known third-party owner, skip Apple (com.apple.*) and unknown folders, and verify the contents are rebuildable. Save and sync work, export or back up wanted offline or unsynced data and verify recovery, then quit the app. The details, including the few cases that need care, are in Is it safe to delete ~/Library/Caches? and How to clear cache on Mac.

Logs. Logs are plain records of what apps did. Deleting old ones does not affect how an app runs. There is a separate guide on log files.

Risky: look before you remove

App support folders. ~/Library/Application Support holds the settings, databases and saved items of your apps. An uninstall alone does not make it disposable. Identify all apps, extensions and services that use it, confirm none still needs it, and inspect retained work. Confirm data is unwanted or export/back up wanted data and verify recovery before removal. See Can I delete the Application Support folder?.

Containers. Apps from the App Store, and many others, keep their data in ~/Library/Containers and ~/Library/Group Containers. This is real data, not a cache. Identify all consumers and inspect retained data; confirm it is unwanted or preserve wanted exports and verified backups. Skip group containers unless all consumers are identified and removed. See Containers and Group Containers.

Developer data. Xcode and similar tools keep large build and device folders. Most of it rebuilds, but a rebuild can take a long time. See the Xcode cleanup guide.

Never: leave these alone

/private/var/folders. macOS and your running apps use it for temporary files. Deleting inside it while apps run can crash them. See Can I delete /private/var/folders?.

System folders. Anything under /System is on a sealed, read-only volume. You cannot change it in a normal way, and you should not try.

Language files. It looks like a clever way to save space, but it can break an app’s signature. See Deleting language files on Mac.

The Photos library. It is one package that holds your photos, edits and database. Manage it from inside the Photos app only.

Find out what is big first

Do not guess. Check which folders are large, and start there. This lists the biggest items in your user caches, smallest first:

du -sh ~/Library/Caches/* | sort -h

To see how much free space you have on the startup disk:

df -h /

Both commands only read. They change nothing.

Common mistakes

• Deleting by folder name alone. A name like “Cache” can hide real data in a few apps. Look at what is inside.
• Using Terminal to remove things in system folders. A typing error cannot be undone.
• Skipping the backup. Time Machine or a copy to another drive takes a few minutes and covers the Risky group.
• Forgetting that the Trash holds the space. Nothing is freed until you empty it.

A way to see it

DiskJoy is our product. It is a Mac app that scans your disk and shows how much space each category could free, without changing anything. Cleanup is not available yet, so today it is a read-only look at where your space went. You can try the scan to see which of the folders above are large on your Mac.

Quick checklist

1. Empty the Trash after a quick look.
2. Delete old installers and downloads you recognise.
3. Prefer app cache controls. For manual clearing, identify a known third-party owner, skip Apple and unknown folders, protect wanted offline/unsynced data, quit the app and clear only verified rebuildable contents.
4. For support folders and containers, follow the detailed guides: identify all consumers, inspect retained data and preserve wanted exports/verified backups. Skip uncertain group containers; leave /private/var alone.
5. Before emptying the Trash, verify wanted data remains recoverable. Waiting alone is not proof that retained data is unnecessary.