Disclosure: I'm Pankaj Kholiya, and I make the app mentioned near the end of this post, Strata Mac Cleaner. The method below works with built-in tools first.
A full disk usually isn't one big problem. It's five or six medium ones stacked up. The good news is that you can find them in about fifteen minutes, and you don't need to hand your Mac over to a tool that deletes things on its own.
Step 1: Look at the built-in breakdown
Open System Settings → General → Storage. You'll see a coloured bar: Applications, Documents, Photos, System Data and so on. Treat it as a rough hint, not a verdict. The labels are broad, and the biggest "mystery" is almost always System Data.
Step 2: Sort Finder by size, not by name
In Finder, open your home folder, switch to List view, and press Cmd+J to show view options. Tick "Calculate all sizes", then click the Size column. Folders now sort by their real total. Start with the top three and drill down. Most people find one folder they had forgotten about: a video project, an old download pile, a virtual machine image.
Step 3: Check the usual hiding places
These are the places I look first, in this order:
- Downloads. Disk images and installers you already ran.
- iPhone and iPad backups. Old devices can leave several gigabytes each.
- Mail attachments. Mail keeps local copies of files people sent you.
- Messages. Photos and videos in long chats add up.
- Time Machine local snapshots. macOS can keep these on the disk itself, and they count toward System Data.
- The Trash. Emptied rarely, full often.
Step 4: Delete the safe stuff first
A simple rule: remove things you can recognise, and move them to the Trash rather than erasing them straight away. Wait a day. If nothing complains, empty it. Skip any guide that asks you to delete folders from system locations by hand. The saving is small and the risk isn't.
Step 5: Know when a tool helps
Doing steps 2 and 3 by hand is fine, but it's tedious. That's why I built a small app for it.
Strata Mac Cleaner draws a map of every folder at its real size, so the big ones are obvious at a glance. It only clears junk through the Trash, so you can put things back. There's no account, and nothing is uploaded from your Mac.
Version 1.0.19 added a System Data room that breaks that bucket into pieces: iPhone and iPad backups by device and age, Mail attachment copies, Messages, Time Machine local snapshots and the Trash.
Practical details:
- Needs macOS 13 or later, and it's a universal build.
- 11 MB download, 43 MB once installed.
- The trial gives you every feature free for 14 days and can remove up to 40 GB, with no account or card.
- Pro is a one-time $5 for the first 200 buyers, then $9.99, with a 14-day refund.
What I'd do in your place
Run steps 1 to 3 first. If you find the culprit, you're done and you paid nothing. If the picture is still muddy, try any disk-mapping tool, mine included, and judge it by whether it shows you the facts without deleting anything behind your back.
I'm Pankaj, based in Dehradun, India, and I build this under Kapybara LLC. Questions and criticism are welcome in the comments.
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