Running out of disk space on a Mac causes real trouble: updates fail, apps slow down and you cannot save new files. If you need to free up storage on Mac, the good news is that macOS shows you exactly what is using your space and gives you several one-click tools to clean it up. This guide walks you through checking your storage, using Apple’s built-in recommendations, and removing the biggest space hogs safely, step by step.
Step 1: Check what is using your Mac’s storage
- Click the Apple menu and open System Settings.
- Click General in the sidebar, then Storage.
- Wait a few seconds while your Mac calculates the colored bar.
You will see categories such as Applications, Documents, Photos, Mail, macOS and System Data, plus a list of Recommendations. Click the small info (i) button next to a category to see more details and delete items directly. This quick look shows where to start, so you do not waste time cleaning the wrong things.
Step 2: Use the built-in storage recommendations
Apple includes simple tools at the top of the Storage screen. Depending on your macOS version, you may see some or all of these:
- Store in iCloud. Moves files from Desktop and Documents, and photos, to iCloud and keeps recent ones on your Mac. Check your iCloud plan first, because it has limited space.
- Optimize Storage. Removes some watched TV shows and movies and keeps only recent email attachments on the Mac.
- Empty Trash Automatically. Permanently deletes items that have been in the Trash for 30 days.
- Reduce Clutter. Helps you find large files and old documents.
Turning on Empty Trash Automatically is helpful, but remember it makes deleted files harder to recover later. If you delete something by mistake, read our guide to recovering deleted files on a Mac as soon as possible.
Step 3: Empty the Trash
Files you delete still use space until you empty the Trash. Right-click the Trash icon in the Dock and choose Empty Trash. Before you do, take a quick look to make sure nothing important is inside, because this step cannot be undone.
Step 4: Delete large files you no longer need
Use the Documents view
In System Settings > General > Storage, click the info button next to Documents. Choose Large Files to see your biggest items sorted by size, then look for old videos, disk images and project files. Select a file and click Delete.
Check your Downloads folder
Open Finder, click Downloads in the sidebar, and sort by Size. Installers (.dmg and .pkg files), zip archives and old PDFs pile up there. Once you have installed an app, you rarely need the installer file.
Look at your Desktop
Many people save everything on the Desktop. Sort the items by size, move what you need to a proper folder, and delete the rest.
Step 5: Remove apps you no longer use
- Open Finder and click Applications.
- Switch to list view and sort by Size.
- Drag unused apps to the Trash, or use Launchpad and press-and-hold on an app to delete it.
- Empty the Trash.
Big apps such as video editors, games and design programs can use many gigabytes. Some apps also leave extra files behind, so use the uninstaller from the developer, if one exists.
Step 6: Clean up Photos, Music and iOS backups
- Photos: The Photos library is often the biggest folder on a Mac. If you use iCloud Photos, enable Optimize Mac Storage in Photos > Settings > iCloud. Also empty Recently Deleted in the Photos app.
- Music and TV downloads: Remove downloaded songs, movies and shows you have finished watching.
- Old iPhone and iPad backups: Connect your device, open it in Finder, click Manage Backups, and delete backups you no longer need. These files can be many gigabytes.
- Mail downloads: Attachments saved by the Mail app can add up. Removing old ones can free space.
Step 7: Understand “System Data” and “Purgeable” space
System Data includes caches, logs, plugins and other files macOS manages. You cannot delete it manually from the Storage screen. It usually shrinks after you restart your Mac and install updates. Many Macs also show purgeable space, which macOS removes automatically when it needs room, so it is not a problem on its own.
If System Data becomes very large and your Mac slows down, our article on a Mac running slow after an update has troubleshooting steps that may help.
Step 8: Move big files to an external drive
If you have large files you want to keep but rarely use, such as video projects or old photo libraries, move them to an external drive. Back them up first. A good rule is to keep two copies of anything valuable. To set this up properly, follow our guide to backing up your Mac with Time Machine.
What you should not delete
- System folders such as /System, /Library and /usr, unless you know exactly what you are doing.
- Files you do not recognize inside your user Library folder, because apps depend on them.
- The only copy of anything important. Always back up first.
- Apps from “cleaner” tools you do not trust. Some programs promise miracles and delete more than they should. If you are tempted, read our article on CleanMyMac before installing anything.
Quick reference: what to clean first
| Location | What to look for | Risk |
|---|---|---|
| Downloads folder | Installers, zip files, old PDFs | Low |
| Large Files list | Old videos and disk images | Low |
| Applications | Apps you no longer use | Low |
| Photos library | Duplicates, Recently Deleted | Medium, back up first |
| iPhone backups | Old device backups | Low if the device is backed up elsewhere |
| Library folder | Unknown system files | High, avoid |
How much free space does a Mac need?
Apple does not publish one exact number, but as a general rule you should keep at least 10 to 15 percent of the drive free. macOS needs room for temporary files, updates and virtual memory. If your Mac is almost full, performance drops and big updates may fail. For official guidance on your Mac, visit Apple Support.
Find large files with a Finder search
Another good way to find space hogs is a Finder search. Open a Finder window, press Command + F, and set the first drop-down to This Mac. Click the Kind drop-down, choose Other, and add File Size, then set it to is greater than and enter a size such as 500 MB. Finder lists every file above that size, so you can sort by size and review the biggest ones. Always make sure a file is not part of an app or system folder before you delete it.
Common mistakes when cleaning a Mac
- Deleting files from system folders. Stay in Documents, Downloads, Desktop and Applications.
- Cleaning without a backup. Take a backup first, then delete.
- Forgetting to empty the Trash. Nothing is freed until the Trash is emptied.
- Turning on every iCloud option without checking the plan. A full iCloud account creates new sync problems.
- Installing several cleaner apps at once. They overlap and may slow your Mac down.
Tips if your Mac has a small drive
Macs with 128 GB or 256 GB of storage fill up quickly. If that is your situation, make cleanup a routine and not a rescue. Keep your photo library and large projects on an external drive, use cloud storage for documents you rarely open, and avoid installing big apps you will only use once. Check Storage once a month, and remember that macOS needs free room to work properly, so do not push the drive to its limit.
Frequently Asked Questions
Why is my Mac storage full when I have few files?
Hidden categories such as System Data, photo libraries, iPhone backups and local snapshots can use a lot of space. Check the colored bar in Storage to see which one is largest.
Is it safe to delete System Data on Mac?
You cannot and should not delete System Data by hand. Restart the Mac and install updates, which often reduces it automatically.
Does emptying the Trash free up space?
Yes. Files in the Trash still take space until you empty it.
Will Store in iCloud delete my files?
It moves files to iCloud and keeps recent ones on your Mac. Check that you have enough iCloud storage, and remember that files stay available only if they sync correctly.
How often should I clean my Mac?
A quick check every month is enough for most people. Look at the Storage screen, empty the Trash and clear your Downloads folder.
Conclusion
To free up storage on Mac, start with System Settings > General > Storage, apply the recommendations, empty the Trash, and delete large files, unused apps and old backups. Move rarely used files to an external drive, and always keep a backup before you delete anything important. A few minutes of cleaning each month keeps your Mac fast and avoids the dreaded “disk almost full” warning.
