What is the fastest way to free up space on a Mac?

Delete or move a few large files: old downloads, videos and installers. Storage settings → Documents → Large Files lists them in seconds.

How much free space should a Mac have?

Aim to keep at least 15–20% of the disk free. macOS needs room for virtual memory, temporary files and updates; major macOS upgrades need tens of gigabytes.

Does cleaning the hard drive make a Mac faster?

It helps when the disk is nearly full, because macOS slows down without room for swap and caches. Beyond that, free space doesn’t make an SSD faster.

Is it safe to use a Mac cleaner app?

Yes, if it shows you everything before deleting, moves files to the Trash and skips system files — MacDiskCleaner does all three.

How to Clean Up Your Mac Hard Drive: A 10-Step Checklist

A safe 10-step checklist to clean up a Mac hard drive or SSD, biggest wins first — with a free method for every step.

This checklist is ordered by how much space each step usually recovers, so you can stop as soon as you have enough. Every step uses the Trash, so nothing is permanent until the very end.

1. Check what’s using space

Open System Settings → General → Storage and wait for the bar to load. Note your free space so you can measure the result, and apply any Recommendations that suit you (Store in iCloud, Optimise Storage, Empty Trash Automatically).

2. Remove large files

Click the ⓘ next to Documents → Large Files, or search in Finder by size (⌘ F → File Size → is greater than 1 GB). Full methods: how to find large files.

3. Clear out Downloads

Sort ~/Downloads by size. Installers, disk images and zip files are safe to delete once you’ve used them.

4. Delete duplicate files

Duplicates pile up from repeated downloads, copied folders and photo imports. Use the Photos Duplicates album for your library and a hash-based duplicate finder for everything else — see duplicate photos and files.

5. Clear caches and logs

Quit your apps, then move app folders in ~/Library/Caches and old files in ~/Library/Logs to the Trash. Details: how to clear cache on Mac.

Do it in one scan with MacDiskCleaner

Finds junk, duplicates and large files across your Mac, shows everything for free, and moves what you choose to the Trash first — so nothing is lost by mistake.

Version 1.1.2 · 4.8 MB · macOS 14 or later · Apple Silicon & Intel

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6. Uninstall apps properly

Dragging an app to the Trash leaves settings and caches behind. After removing an app, check ~/Library/Application Support, ~/Library/Caches and ~/Library/Containers for folders with its name — or use an uninstaller that finds them for you.

7. Delete old iPhone and iPad backups

Connect your device, select it in Finder and click Manage Backups, or open ~/Library/Application Support/MobileSync/Backup. Each old backup can be tens of gigabytes.

8. Clean up System Data

Time Machine local snapshots, Xcode data and virtual machines all count as System Data. Our System Data guide has the exact commands.

9. Archive old projects to an external drive

Photos, video projects and finished work you rarely open don’t need to live on your internal SSD. Copy them to an external drive, check the copy, then remove the originals.

10. Empty the Trash and restart

Press ⇧ ⌘ ⌫ to empty the Trash, then restart to clear temporary files. Check Storage again.

Do all ten steps in one scan

MacDiskCleaner covers steps 2 to 8 in one pass: large and old files, downloads, duplicates, caches and logs, developer data and app leftovers, each with its size and location. You choose what goes and everything is moved to the Trash first. Scanning is free, and so is the first 2 GB of cleanup.

How much space can you expect to recover?

It depends entirely on how the Mac has been used. Macs with years of downloads, device backups or developer tools often have tens of gigabytes to reclaim; a new Mac may have very little. A free scan tells you before you spend any time.