How to Free Up Disk Space on Mac: 12 Safe Ways (2026)
"Your disk is almost full." Few Mac messages are more annoying, especially on a MacBook Air with a 256 GB drive, or right before a macOS update that needs gigabytes of free space.
Most guides answer with "install this cleaner app". But the biggest wins usually come from finding a few large files you forgot about, not from deleting cache files. This guide starts with the free tools already built into macOS, then shows where apps like Magic Disk Cleaner and DaisyDisk actually help, and which folders you should never touch.
Quick Answer
Check what's using space: Go to System Settings → General → Storage.
Turn on the built-in recommendations: Store in iCloud, Optimize Storage and Empty Trash Automatically.
Delete the big stuff: old downloads, large videos, iPhone/iPad backups and unused apps.
Find hidden space hogs with a disk analyzer like DaisyDisk or DiskMap.
Clear caches safely with Magic Disk Cleaner ($0.99 on the Mac App Store).
Empty the Trash. Deleted files don't free space until you do.
Step 1: Check What's Using Your Mac's Storage
Before deleting anything, see where the space went.
Open Apple menu → System Settings.
Click General → Storage.
Wait for the colored bar to finish calculating.
You'll see categories like Applications, Documents, Photos, iCloud Drive, macOS and System Data. Click the (info) button next to a category to see the files inside it and delete them directly. This is especially useful for Applications, Documents, Messages, Music Creation, Podcasts, TV and Trash.
What Is "System Data" on Mac?
System Data (called Other on older macOS versions) is a catch-all category. It covers any Apple or third-party files that don't fit a more specific category, such as caches, logs, Time Machine local snapshots, virtual machines, app support files and developer data.
It can grow very large, but you shouldn't try to delete it blindly. The methods below, especially disk analyzers, show what's actually inside it.
Step 2: Use macOS's Built-In Storage Recommendations
In System Settings → General → Storage, macOS offers a few recommendations:
RecommendationWhat it doesGood for
Store in iCloud Keeps full-resolution photos and older documents in iCloud, and downloads them only when needed Users with iCloud+ storage
Optimize Storage Removes Apple TV movies and shows you've already watched (you can download them again) TV and movie watchers
Empty Trash Automatically Deletes items that have been in the Trash for 30 days Everyone
Note: Storing files in iCloud uses your iCloud storage plan. Apple's paid iCloud+ plans start at 50 GB for $0.99 a month in the US.
Step 3: Delete the Biggest Space Wasters First
These usually free up the most space, and they're completely safe.
1. Clean Out Your Downloads Folder
Open Finder → Go → Downloads. Sort by Size, via View → Show View Options or by clicking the Size column in List view. Old installers, ZIP files and videos pile up here quickly.
2. Delete Old iPhone and iPad Backups
Local device backups can take tens of gigabytes. In System Settings → General → Storage, click the next to iOS Files, or manage backups from Finder when your device is connected. Only delete backups you no longer need.
3. Uninstall Apps You Don't Use
In Storage → Applications, sort by size and look at Last Accessed. Delete apps you haven't opened in months. Large games and creative apps often take many gigabytes each.
4. Move Your Photos or Video Library to an External Drive
Photo and video libraries are usually the largest folders on a Mac. Apple supports moving the Photos library and iMovie library to an external drive, which is a great option for Macs with small internal SSDs.
5. Remove Downloaded Media
Delete downloaded music, movies and podcasts you can stream or download again later.
6. Clear Mail Junk and Deleted Items
In the Mail app, choose Mailbox → Erase Junk Mail and Mailbox → Erase Deleted Items.
7. Empty the Trash
Files you delete stay on your disk until you empty the Trash. Right-click the Trash in the Dock and choose Empty Trash.
Step 4: Find Hidden Large Files With a Disk Analyzer
macOS's Storage view is helpful, but it doesn't show everything, especially inside System Data. A disk space analyzer scans your whole drive and shows exactly which folders and files are biggest.
DaisyDisk: Best Visual Disk Analyzer
DaisyDisk shows your disk as an interactive, colour-coded ring map. You click into the biggest segments to find what's taking space.
Price: $9.99 one-time lifetime license, for up to 5 personal Macs. A free trial is available.
Compatibility: macOS 10.13 or newer, on Apple Silicon and Intel
Standout features:
Scan as administrator to reveal restricted folders
Break down "System Data" and "Other"
Find and purge Time Machine local snapshots
Scan cloud drives (Dropbox, Google Drive, OneDrive, Box)
Press the spacebar to preview files
Protects system files automatically, and you decide what gets deleted
Privacy: The developer says it doesn't collect or transmit any data.
DiskMap: Find Large Files Fast
DiskMap is another visual analyzer focused on quickly finding large files and folders.
Duplicate Finder and Cleaner
Photos, downloads and project files often exist in multiple copies. Duplicate Finder and Cleaner finds identical files so you can keep one copy.
Tip: Disk analyzers usually recover far more space than cache cleaners, because they point you to the large files that actually fill your drive.
Step 5: Clear Caches Safely With Magic Disk Cleaner
Caches are temporary files that apps and macOS create to load things faster. Browsers, chat apps and developer tools can build up gigabytes of cache over time. Deleting them is generally safe because apps recreate what they need, although the first launch afterwards may be slightly slower.
Magic Disk Cleaner by independent developer Sascha Simon is a small, focused cache cleaner from the Mac App Store. It does one job and does it transparently.
Key Features
28 cleaning modules ("finders") in one scan, covering:
Browsers: Safari, Firefox, Chrome, Edge, Brave
Messaging: Discord, Signal, Slack, Teams, WhatsApp, Messages, FaceTime
Mail: Mail, Thunderbird
Media: Music, TV, Maps, Spotify
Developer tools: Xcode, VS Code, Homebrew, CocoaPods, npm, pip, Gradle, Maven, Cargo
macOS: system caches, logs, crash reports and saved application states
Automatic scan that starts as soon as you open the app
Nothing is deleted automatically. Expand any category to see every file with its full path and size, and choose exactly what goes.
Trash or permanent: send cleaned files to the Trash so you can restore them, or delete them immediately
Search and sort results by name, path or size
Individual modules can be switched off in Settings (added in version 5.3)
Cancel scanning or cleaning at any time
Only touches caches and temporary data, according to the developer. Your documents, settings and libraries aren't included.
How to Use Magic Disk Cleaner
Install Magic Disk Cleaner from the Mac App Store.
Open it. The scan starts automatically.
Review the summary: the total space you can reclaim, and which categories hold the most.
Expand categories and untick anything you want to keep.
In Settings, choose Move to Trash if you want to be able to undo.
Click Clean, then empty the Trash when you're sure.
Pros
Very cheap and very small
Transparent, with every file shown before deletion
The Trash option makes cleaning reversible
Strong coverage of developer caches
No data collection
Cons
Only cleans caches and temporary files. It won't find your large forgotten videos.
Requires macOS 15.6 or later
Caches grow back over time, which is normal
Important: Newer versions of Magic Disk Cleaner can also find local iOS device backups. Before deleting these, make sure you have another backup of your iPhone or iPad, for example in iCloud.
Which should you choose?
Most space, fastest: DaisyDisk, to find the big files
Cheap, focused cache cleanup: Magic Disk Cleaner
One app for several maintenance tasks: BuhoCleaner
Developers: Magic Disk Cleaner's developer modules, or Cleaner for Xcode
Step 6: Extra Space Savers for Specific Users
For Developers
Xcode DerivedData, simulators and archives can use tens of gigabytes. Use Magic Disk Cleaner's Xcode module or Cleaner for Xcode.
Package manager caches (Homebrew, npm, pip, Cargo, Gradle) grow constantly. Magic Disk Cleaner covers these too.
Docker images and virtual machines are often the biggest hidden files. Check them with a disk analyzer.
For Creators
Old video project caches, render files and proxy media can be huge. Clear them from inside your editing app.
Archive finished projects to an external drive.
For MacBook Air Owners With 256 GB
Turn on Store in iCloud.
Keep your Photos library on an external SSD.
Stream music and video instead of downloading.
Run a disk analyzer every few months.
Compress Files You Want to Keep
If you want to keep old files but rarely open them, compress them. Right-click → Compress creates a ZIP. For better compression, see our guide on opening and creating archives on Mac.
Step 7: Temporarily Free Up Space (For macOS Updates)
If you need space for a macOS update, Apple suggests starting your Mac in Safe Mode. It clears certain system caches, which may give you enough room to finish the update. The caches are recreated afterwards. Restart normally to leave Safe Mode.
What Is "Purgeable" Space?
Purgeable space is data macOS can remove automatically when space runs low, such as local snapshots, cached iCloud files and some caches. macOS manages it on its own, so you generally don't need to delete it manually.
What You Should NEVER Delete on a Mac
System and Library system folders, unless you know exactly what a file is
Files inside the macOS storage category
App support files for apps you still use Keychain files
Photos library internals. Always manage photos from inside the Photos app, never by opening the library package.
Your only backup of an iPhone or iPad
Rule of thumb: If you don't recognise a file and it isn't inside your own Downloads, Documents, Desktop or Movies folders, leave it alone or check it with a disk analyzer first.
Do You Really Need a Mac Cleaner App?
Honestly, not always. macOS manages many caches and purgeable files by itself. Cleaner apps are most useful when:
You want to see what's taking space, as with disk analyzers
You use many browsers, chat apps or developer tools that build up large caches
You're short on space right now and need a quick, transparent cleanup
Be cautious with any app that promises to make your Mac "run faster" with one magic button, or shows scary warnings to push you into buying. Choose apps that show every file before deleting, like Magic Disk Cleaner and DaisyDisk do, and only download from the Mac App Store or the official developer site.
Deleted something by mistake? Check the Trash first, or restore from Time Machine. For files already removed from the Trash, a recovery tool like Disk Drill may help, but recovery is never guaranteed, especially on SSDs.
Frequently Asked Questions
How do I free up disk space on my Mac quickly?
Open System Settings → General → Storage and turn on the recommendations. Then delete large items in Downloads, remove old iPhone backups and unused apps, and empty the Trash. A disk analyzer like DaisyDisk finds the biggest files in minutes.
Is Magic Disk Cleaner safe?
Magic Disk Cleaner is sold on the Mac App Store and only targets caches and temporary data. It never deletes anything without your confirmation, and it can move cleaned files to the Trash so you can restore them.
Is Magic Disk Cleaner free?
No. It costs $0.99 on the Mac App Store (US price). It supports Family Sharing.
What macOS version does Magic Disk Cleaner need?
Version 5.3.0 requires macOS 15.6 or later and runs on Apple Silicon and Intel Macs.
How do I clear System Data on Mac?
System Data is a mix of caches, logs, snapshots and app data. Use a disk analyzer like DaisyDisk to see what's inside, clear caches with Magic Disk Cleaner, delete old iOS backups, and let macOS remove local snapshots automatically. Don't delete system folders by hand.
Is it safe to delete cache files on Mac?
Generally yes, since apps recreate caches as needed. Expect slightly slower first launches afterwards. Avoid deleting caches while apps are open.
Why is my Mac storage full when I haven't saved much?
Common causes are iPhone/iPad backups, Photos libraries, Time Machine local snapshots, large downloads, Mail and Messages attachments, virtual machines and developer caches.
What's the difference between a disk cleaner and a disk analyzer?
A cleaner, like Magic Disk Cleaner, removes predefined temporary files. An analyzer, like DaisyDisk, shows everything on your drive so you can find and delete large files yourself. Analyzers usually free up more space.
How much free space should a Mac have?
There's no official number. Keeping around 10–15% free is a widely used guideline, and macOS updates need extra room during installation.
Conclusion
The safest way to free up disk space on a Mac follows a simple order:
Look first: System Settings → General → Storage
Use Apple's recommendations: iCloud, Optimize Storage, automatic Trash emptying
Delete big, obvious files: downloads, backups, unused apps, media
Find hidden space hogs with DaisyDisk or DiskMap
Clear caches transparently with Magic Disk Cleaner
Explore Magic Disk Cleaner, DaisyDisk and more storage tools in our Mac utility software collection.
Last updated: September 2026. App details verified from the Mac App Store and official developer websites.
