If you’re wondering how to free up storage space on a Mac, start with one screen: Apple menu > System Settings > General > Storage. It shows what’s eating your startup disk, and most of the space comes back from four places — the Trash, your Downloads folder, apps you stopped using, and duplicates parked in iCloud or old iPhone backups.
The whole job takes 30 to 60 minutes for most people. You don’t need a cleaner app or a reinstall, and nothing here requires you to touch system files. Start with the quick list, then work down the seven steps in order.
Quick ways to free up space right now
- Empty the Trash. Deleted files still sit there taking up room until you do.
- Clean out Downloads. Installers, .zip archives, and screenshots pile up fastest here.
- Remove unused apps. Drag them to the Trash instead of just leaving them installed.
- Turn on Optimize Storage for Photos and Store in iCloud for documents.
- Delete old iPhone backups — a single backup of a 256 GB phone can run 10–20 GB.
More below, including what never to delete.
Table of Contents
- What You Need
- Step-by-Step: How to Free Up Storage Space on a Mac
- Common Mistakes
- Tips for Keeping Your Mac From Filling Up Again
- Frequently Asked Questions
- Why is my storage full but I can’t delete anything?
- Why is System Data taking up so much space on my Mac?
- How do I check how much storage is left on my Mac?
- How much storage space does a Mac need to install a macOS update?
- How can I free up 20 GB of storage on a Mac?
- Is it safe to empty the Trash on Mac?
- Conclusion
What You Need
A few things make this much safer. Have a recent backup first — Time Machine on an external drive, or a signed-in iCloud account with iCloud Drive covering your Desktop and Documents.
You’ll also want administrator access, since removing apps and some caches needs it. Grab an external drive formatted as APFS if you have years of video, project files, or an old photo library to move rather than delete.
Finally, know which macOS you’re on. Apple menu > About This Mac shows the version. It matters in a few places: macOS 26 (Tahoe) removed Launchpad, so there’s no Launchpad grid to uninstall from, and Reduce Clutter was last seen in macOS 12 Monterey. Every path in this guide works on current macOS, with older-version notes where they differ.
Step-by-Step: How to Free Up Storage Space on a Mac
Here’s roughly what each fix tends to reclaim. Actual numbers vary a lot depending on your drive and habits, so treat these as expectations, not promises.
| What you clean up | Typical space reclaimed | Difficulty |
|---|---|---|
| Unused applications | 5–30 GB | Easy |
| Old iPhone and iPad backups | 10–20 GB each | Easy |
| Downloads folder | 2–5 GB | Easy |
| Trash, including per-app trash | 2–5 GB | Easy |
| Caches and logs | 1–5 GB | Easy |
| Local Time Machine snapshots | Varies, sometimes 10 GB+ | Medium |
1. Check Your Mac’s Storage Overview
Open Apple menu > System Settings > General > Storage. Give it a few seconds — the bar graph builds as it scans, and it’s an estimate, not exact accounting.
The categories are worth understanding before you delete anything. Applications is your installed apps. Documents and Desktop are your files. Photos and Mail are the libraries. macOS is the system itself and shouldn’t shrink much on its own.
System Data is the catch-all: anything Apple or a third-party app created that doesn’t fit a neater category. Called “Other” before macOS Monterey, it’s where local Time Machine snapshots, iPhone backups, log files, Mail attachments, and app support folders land. It’s also the number that balloons and drives people up the wall.
How to tell it worked: the bar graph shrinks, and the free space figure at the top rises. Take a mental note of the free number now so you have a before and after.
2. Review and Clear Unneeded Downloads
Open Finder and click Downloads in the sidebar, or Go > Downloads from the menu bar. Sort by Date Added, oldest first — that’s where the accumulation shows.
Look for .dmg and .pkg installers you already used, .zip archives that got extracted and never deleted, duplicate screenshots, and PDFs you read once. Drag keepers to Desktop or Documents if you want them somewhere you actually look, and delete the rest.
The step people miss: emptying the Trash. Until you do, none of that space comes back. Click the Trash icon in the Dock, then Empty Trash.
How to tell it worked: the Downloads folder is short and the free space figure in System Settings > General > Storage is higher than it was before you started.
3. Delete Large or Unused Applications
Find your biggest apps first. In Finder, switch to List View, then View > Show View Options and tick Calculate all sizes. Now the Size column is real.
Sort descending by Size and look at the Applications folder. Anything you haven’t opened in a year is a candidate. Quit the app completely first — check the Dock for a dot under the icon or use Force Quit from Apple menu > Force Quit.
On current macOS, drag the app to the Trash. No installer script runs that way, but macOS handles most apps cleanly. Apps with an Uninstaller — many security tools and creative suites ship one — should use it instead so preferences and helpers go with them.
How to tell it worked: the Applications size in Storage drops, and after a restart the app no longer appears in your recent items.
4. Remove Old Files from Documents and Desktop
Documents and Desktop are where finished work goes to die. Open Finder, click Documents, and use the search field with This Mac selected, then filter by Size and set it to Larger than 1 GB.
If that feels slow, switch to List View and press Cmd + Shift + Period to reveal hidden files. Sorting by Size then exposes things like stray disk images, old project archives, and leftover .zip folders. Click the disclosure triangles next to a folder name to drill into it — that’s the same technique Mac users recommend on r/mac for finding space hogs without installing anything.
Move files you want to keep to an APFS external drive, then open one and confirm it plays before you disconnect. Deleting after that is safe.
How to tell it worked: the Documents and Desktop bars shrink and the folder feels empty again.
5. Optimize Photos, Videos, and Email Storage
Open Photos, go to the Photos menu > Settings, and choose Optimize Mac Storage. Full-resolution originals stay in iCloud and lightweight versions live on your Mac. Turn on Show Duplicates in the same window to see near-identical shots in one place.
Then handle Recently Deleted. Photos keeps deleted items for about 40 days, and they keep taking space the whole time. Select them, choose Delete, and confirm permanently this time.
For Mail, open Mail > Mailboxes > Junk and Mail > Mailboxes > Deleted, then use the Erase buttons in each window. Large attachments and old conversations sit there indefinitely otherwise. Search Mail for messages over a certain size with the size filter, since one 2 GB video attachment can undo an afternoon’s work.
How to tell it worked: the Photos bar shrinks after Optimize Mac Storage kicks in, and Recently Deleted is empty.
6. Manage iCloud Drive, Time Machine, and Mail Storage
iPhone backups are the single biggest surprise for most people. Open Finder, Go > Go to Folder, and paste this path:
~/Library/Application Support/MobileSync/Backup
Each folder there is one device, named by UDID. Old ones are safe to delete as long as you don’t need that restore point. To do it with a menu instead, connect the iPhone and open Finder > the device > Manage Backups.
Local Time Machine snapshots are invisible in Finder entirely. Open Terminal and run tmutil listlocalsnapshots / to list them, and tmutil deletelocalsnapshots 2026-01-05-101010 with a name from that list to remove one. macOS prunes these on its own; deleting them just gets you there sooner.
On shared Macs, unused user accounts hold onto data in /Users. Remove an account from System Settings > Users & Groups only after confirming nobody needs the files.
How to tell it worked: System Data usually drops noticeably right after a restart, because macOS recalculates its estimate.
7. Clear Safe Caches and Restart
Some apps rebuild their caches automatically. In Safari, Safari > Settings > Advanced > Show Advanced Settings > Show Develop menu, then Develop > Empty Caches. In Chrome, the path is Settings > Privacy and security > Clear browsing data > Cached images and files.
On Finder, press Cmd + Shift + G and paste ~/Library/Caches. Delete the contents, never the Caches folder itself — apps recreate it, and removing the folder can break permissions. Leave /Library/Caches alone unless you know what you’re doing.
If you’re trying to install a macOS update and it refuses, you need roughly 25 GB free. Running the steps above usually gets there. If not, restart into Safe Mode — hold Shift while restarting — which clears far more system cache than a normal restart, install the update, then restart normally.
How to tell it worked: a restart. Startup gets noticeably faster when the drive has real headroom, and macOS regenerates the storage graph on a more accurate pass.
Common Mistakes
Deleting things inside the wrong folders. Never touch /System, /Library/Keychains, or ~/Library/Preferences. Those hold things like your saved passwords, login credentials, and Wi-Fi details. If a folder is under /System, assume it stays.
Emptying the Trash without looking first. That is where “deleted” files go to wait. Check it, then empty it.
Removing shared components. Deleting a single file out of /Applications or /System/Library breaks every app that depends on it. Uninstall apps whole, or not at all.
Skipping the backup. Ten minutes with Time Machine before a big purge costs nothing. A wrong drag at 2 a.m. costs the afternoon.
Treating the storage bar as exact. It’s an estimate that lags reality by a restart or two. Finder’s Calculate All Sizes gives real numbers, and it’s the only method that shows what System Data actually contains.
Tips for Keeping Your Mac From Filling Up Again
A Mac runs best with roughly 15 to 20 percent of its drive free. Check that number in System Settings > General > Storage a couple of times a year, and treat it like a range, not a line.
Turn on Empty Trash Automatically after 30 days in Storage settings. It costs you a safety net you rarely use, and it stops deleted media from silently accumulating.
Keep one external drive formatted as APFS for archives, and move finished projects there rather than deleting them. It’s the difference between freeing space and losing work.
Finally, watch for quiet space eaters. Apple TV and iTunes series auto-download new episodes, group chats collect video, and voice memos from your phone sync over. Turning off auto-downloads in TV is the fix most people never find on their own.
Frequently Asked Questions
Why is my storage full but I can’t delete anything?
Most often the data isn’t gone yet. Deleted files sit in the Trash, and Photos keeps items in Recently Deleted for about 40 days, while Mail holds junk and deleted messages until you erase them. Local Time Machine snapshots also count toward System Data and are invisible in Finder. Empty the Trash, clear Recently Deleted permanently, and restart to force macOS to recalculate.
Why is System Data taking up so much space on my Mac?
System Data is a catch-all category for files that don’t fit elsewhere: local Time Machine snapshots, iPhone backups, log files, Mail attachments, app support folders and virtual machine images. It grew large partly because it was called Other before macOS Monterey, and it is recalculated lazily. Restart the Mac, then use Finder’s Calculate All Sizes to see what sits inside.
How do I check how much storage is left on my Mac?
Open Apple menu, then System Settings, then General, then Storage. The top of that pane shows your startup disk and how much space is available, with a bar graph breaking usage into Applications, Documents, Desktop, Photos, Mail, System Data and macOS. For exact folder sizes, use Finder in List View with Calculate All Sizes enabled instead of the bar graph.
How much storage space does a Mac need to install a macOS update?
Apple generally asks for around 25 GB of free space to complete a macOS update, and more on newer releases with extra features. If you are short, clear Downloads, remove unused apps, delete old iPhone backups, then restart into Safe Mode, which clears additional system cache. Install the update from Safe Mode and restart normally afterwards.
How can I free up 20 GB of storage on a Mac?
The biggest wins usually come from unused apps, which can total 5 to 30 GB, and old iPhone backups at 10 to 20 GB each. Add a Downloads sweep of 2 to 5 GB, an empty Trash worth another 2 to 5 GB, and 1 to 5 GB from caches. Enable Optimize Mac Storage for Photos and Store in iCloud for Documents, then verify against the number in Storage settings.
Is it safe to empty the Trash on Mac?
Emptying the Trash is permanent. Files in it aren’t recoverable through Finder unless you have Time Machine or another backup covering them, so open the Trash and look before you commit. Turning on Empty Trash Automatically after 30 days in Storage settings gives you a month to change your mind. That setting applies to the Finder Trash only, not Photos Recently Deleted or Mail junk.
Conclusion
If you need to know how to free up storage space on a Mac, the order matters. Open Storage first so you’re deleting with real numbers instead of a guess, back up, then work through Downloads, apps, backups, Photos, Mail, and caches — emptying the Trash after each pass.
Skip the third-party cleaner apps. Every fix above uses tools already in macOS. Run through Storage again after a restart, keep your free space above 15 to 20 percent, and the problem stays away.