How to Free Up Disk Space on Mac (2026 Guide)

Quick summary: To free up disk space on Mac: (1) run a visual disk scan with FreeUpDisk to find what's largest, (2) optimize iCloud Photos to "Optimize Mac Storage" (can recover 30–150 GB), (3) clear ~/Library/Caches, (4) delete old iOS device backups. First-time cleanup typically recovers 30–100 GB.

Your Mac says storage is almost full. You've deleted a few things but the bar barely moved. This guide shows you where all that space actually went - and how to get it back without accidentally removing something important.

Why your Mac storage fills up without obvious files

Macs are good at hiding where space is going. The culprits are usually:

• iCloud downloads - when iCloud is set to "Download Originals," your full photo library lives on your Mac, not just in the cloud
• App caches - Slack, Chrome, Dropbox, and Xcode cache data locally. Slack alone can store 5–20 GB. Xcode's simulator cache can hit 40+ GB
• Old iOS backups - iTunes/Finder keeps full iPhone backups on your Mac, often 10–50 GB each
• Large files you forgot about - screen recordings, video exports, downloaded movies
• node_modules (developers) - each project directory can have 500 MB–2 GB of dependencies

The problem is Mac Finder shows you folders, not a ranked view of what's actually biggest. Clicking through folders one by one can take an hour and still miss the real space hogs.

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Step 1: Use a visual disk analyzer (fastest method)

The quickest way to find what's eating your Mac's storage is a tool that shows your entire drive as a visual map.

FreeUpDisk is a free disk space analyzer for Mac. It scans your drive in under 30 seconds and shows a treemap - every file is a rectangle, and bigger rectangles mean bigger files. You instantly see what's large without clicking through dozens of folders.

Once you've seen the full picture, everything else in this guide is easier because you know exactly what to target.

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Step 2: Empty the Trash

This one sounds obvious, but files you've deleted are still taking up space until you empty the Trash.

• Cmd + Shift + Delete to empty Trash, or
• Right-click the Trash icon in the Dock → Empty Trash

If you haven't done this in a while, you might reclaim a few GB right here.

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Step 3: Clear your Downloads folder

Downloads is where files go and never leave. Sort it by size and you'll usually find old .dmg installers, .zip archives, video files, and disk images you downloaded once and forgot about.

1. Open Finder → Downloads
2. View → as List, then click the Size column to sort largest first
3. Delete everything you've already used - installers, zip files, .dmg files

This alone typically frees 5–15 GB.

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Step 4: Remove apps you don't use

1. Open Finder → Applications
2. Right-click → Get Info on any app to see its size
3. Drag unused apps to the Trash

For a cleaner uninstall (removes preference files and caches too), use a third-party uninstaller. But dragging to Trash is fine for most apps.

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Step 5: Clear app caches

Mac apps store cache data in ~/Library/Caches. Most of this is safe to delete - apps will just rebuild their caches when they next run.

1. Open Finder → Go → Go to Folder
2. Type ~/Library/Caches and press Enter
3. You can safely delete the contents of most folders here (not the folders themselves)

Caches to specifically target:

• com.google.Chrome - browser cache, can be several GB
• com.tinyspeck.slackmacgap - Slack cache, often 5–15 GB
• com.apple.dt.Xcode - Xcode caches, can be 20+ GB

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Step 6: Delete old iPhone/iPad backups

Every time you back up your iPhone or iPad to your Mac, it stores a full backup - often 10–50 GB per device.

1. Open Finder
2. Connect your device, or go to Finder → [Your iPhone] in the sidebar
3. Under Manage Backups, you can see and delete old backups

Alternatively: ~/Library/Application Support/MobileSync/Backup/ - this folder contains all your device backups.

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Step 7: Manage iCloud settings

If you use iCloud Photos with "Download Originals," your entire photo library is stored locally. If your library is 100 GB, that's 100 GB on your Mac.

Switch to Optimize Mac Storage:

1. Open System Settings → Apple ID → iCloud → Photos
2. Select Optimize Mac Storage

macOS will keep lower-res versions locally and store originals in iCloud, freeing significant space.

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Step 8: Clear Xcode caches (developers)

If you use Xcode, its derived data and simulator caches can quietly consume 20–50 GB.

• Derived data: ~/Library/Developer/Xcode/DerivedData - delete the contents
• iOS Simulators: ~/Library/Developer/CoreSimulator/Devices - you can delete simulators you don't use from Xcode → Preferences → Components
• Archives: ~/Library/Developer/Xcode/Archives - old app archives you no longer need

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Step 9: Find and remove duplicate files

Photos imported multiple times, documents backed up to multiple locations, and project files copied before editing - duplicates are common and often overlooked.

Run FreeUpDisk to see a full size-sorted view of your drive. Duplicates show up as identically-sized files in different locations, making them easy to spot and clean up.

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How much space can you recover on Mac?

What you clean	Typical space recovered
Downloads folder	5–20 GB
App caches (Slack, Chrome, etc.)	3–20 GB
Xcode caches (developers)	10–50 GB
Old iPhone backups	10–50 GB per backup
Duplicate photos/videos	10–50 GB
Unused apps	1–10 GB

First-time cleanup on a Mac that's been used for a year or two typically recovers 30–100 GB.

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Mac's built-in storage manager vs. FreeUpDisk

Apple includes a basic storage manager (Apple menu → About This Mac → Storage → Manage). It shows high-level categories like Documents, Apps, and System Data - but it doesn't show individual file sizes or let you compare folders visually.

FreeUpDisk gives you the file-level view: a treemap where you can see at a glance that one folder is 40 GB and another is 200 MB, without having to click through each one manually.

Both are useful, but when you need to actually find and remove the space hogs, the visual overview of FreeUpDisk is much faster.

Get FreeUpDisk free →

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Summary

Step	What it clears	Time
Empty Trash	Deleted files	30 seconds
Clean Downloads	Installers, archives	5 minutes
Clear app caches	Chrome, Slack, etc.	5 minutes
Delete old backups	iOS device backups	2 minutes
Optimize iCloud	Photo library	2 minutes
Visual disk scan	Everything else	2 minutes

Start with the visual scan so you know what you're actually dealing with. Everything else follows naturally from there.