How to Free Up Space on a Mac, Safely
When your Mac warns you that the disk is almost full, the fix is rarely to delete things at random. Start with the safe, reversible cleanups, then hunt down the large files you actually forgot about, and leave the system files alone.
Follow these steps
- Check what is actually using the space. Click the Apple menu, then About This Mac, then More Info, then Storage Settings. The breakdown shows whether apps, documents, photos, or system data are eating the disk, so you clean the right thing first.
- Use the built-in storage recommendations. In the same Storage Settings screen, use the recommendations to empty the Trash automatically, review large files, and store files in iCloud only if you understand that they will need the internet to open. Read each option before turning it on.
- Empty the Trash and Downloads on purpose. Open the Trash and empty it, then sort Downloads by size and delete installers, duplicates, and files you already saved elsewhere. The Trash still counts against your disk until it is emptied.
- Find your largest files. In Storage Settings, open Documents and sort by size, or use Finder to search and sort a folder by size. A few old videos, disk images, or installers often free more space than hundreds of small documents.
- Remove apps you no longer use. Drag unused apps from Applications to the Trash, then empty it. Check for apps you installed for one job and never opened again, and keep only the ones you actually use.
- Let macOS handle purgeable space. Space marked as purgeable is space macOS can free on its own when you need it, for example cached files and local snapshots. You do not need to chase it with a cleaner app; freeing real files matters more.
- Move big media to an external drive, then verify it. Copy large photo or video libraries to an external drive, open them from the drive to confirm they work, and only then delete the originals. Never delete the only copy of anything you care about.
What NOT to do
- Never delete files inside the System folder or Library folders you do not recognise. macOS needs them, and guessing can break your Mac.
- Do not install a random cleaner app that promises to free gigabytes. Many bundle unwanted software and delete caches your Mac will just rebuild.
- Do not empty the Trash before checking that nothing in it is the only copy of a file you need.
- Do not delete everything in Downloads in one sweep. Installers and documents often live there alongside junk.
If you freed a comfortable amount of space, keep an eye on it and repeat the Downloads and Trash sweep now and then. If the disk fills again quickly, the largest-files check will show you what keeps growing.