Running low on disk space and not sure where it all went? You don't need to open Terminal or learn a single command to find the biggest files on Mac. macOS has built-in tools that get you surprisingly far, and a handful of third-party apps can show you the full picture in seconds. Here's a practical, GUI-only walkthrough — plus honest guidance on what's safe to remove and what to leave alone.
Start Here: macOS Built-In Tools
About This Mac → Storage
The quickest first look lives inside macOS itself.
- Click the Apple menu () in the top-left corner.
- Choose System Settings (macOS 13 Ventura and later) or System Preferences (macOS 12 Monterey).
- Go to General → Storage (Ventura+) or click Storage in the toolbar.
- Wait a moment for the bar chart to populate. You'll see broad categories: Applications, Documents, System Data, and more.
This view is useful for a high-level overview but it doesn't let you drill into individual folders or sort files by size. "System Data" in particular can be frustratingly opaque — it often includes caches, Time Machine local snapshots, and purgeable space that macOS hasn't reclaimed yet.
Finder's Built-In Sort by Size
Finder can sort files by size, which is handy for flat folders but not for finding large items buried inside nested directories.
- Open a Finder window and navigate to the folder you want to inspect (your home folder
~is a good starting point). - Switch to List view (⌘2).
- Click the Size column header to sort descending.
- Right-click the column header bar and make sure Calculate all sizes is checked — without this, folders show a dash instead of their true size.
The major limitation: Finder only shows the size of items directly inside the current folder. A folder full of large video files buried three levels deep won't stand out until you navigate into it. For a true ranked view across your whole drive you need something that recurses.
The Fastest GUI Option: Crumb's Visualize View
If you want to see every file and folder ranked by size — including items deep inside ~/Library — without writing a single command, Crumb handles this well. Its Visualize tab produces a disk treemap and a sorted largest-items list that covers your whole Mac. Each item includes a note on whether removing it is safe, risky, or something to leave to the OS. That last part matters: blindly deleting things inside /System or your app support folders can break software in ways that aren't immediately obvious.
You can download Crumb and run one full scan on the free tier to see where your gigabytes are hiding before deciding whether to clean anything.
Common Culprits: Where Big Files Actually Hide on Mac
Once you have a tool that can recurse into directories, these are the locations that tend to surprise people:
- ~/Library/Caches — Per-app cache files. Usually safe to delete for apps you're not currently running, but apps will regenerate them. Size here varies wildly; some developers are more aggressive than others.
- ~/Library/Application Support — App data, game saves, local databases. Do not bulk-delete this folder. Inspect individual subfolders and only remove data for apps you've already uninstalled.
- ~/Library/Developer — Xcode simulators, derived data, and archives. If you use Xcode, this folder can easily reach 30–50 GB. Derived data is safe to delete; it will be rebuilt on the next build.
- ~/Movies, ~/Downloads, ~/Desktop — User-created or downloaded files. Entirely your call, but large video projects are a common surprise here.
- /Library/Logs and ~/Library/Logs — System and app logs. Safe to delete; macOS and apps will create new ones.
- Time Machine local snapshots — Stored inside
/.MobileBackupsor handled by APFS. macOS reclaims these automatically when disk pressure rises, so you generally don't need to force-delete them. - Trash — Don't overlook it. Files in the Trash still occupy disk space until you empty it.
What Is "System Data" on Mac and Can You Shrink It?
"System Data" in the Storage overview is a catch-all for anything macOS can't neatly categorize. It typically contains:
- APFS purgeable space (local Time Machine snapshots macOS will free under pressure)
- System caches in
/Library/Caches - Temporary files in
/private/var/folders - Virtual memory swap files in
/private/var/vm
Swap files and APFS snapshots should be left to macOS to manage — deleting swap files while the system is running is dangerous. Caches and temp files in the locations above are generally safe to clear, but the OS will recreate them as needed.
Method Comparison
| Method | Recurses into subfolders | Shows removal risk | Requires Terminal |
|---|---|---|---|
| About This Mac → Storage | No (categories only) | No | No |
| Finder list view (sorted by size) | One level at a time | No | No |
du -sh * | sort -rh in Terminal |
Yes | No | Yes |
| Crumb Visualize | Yes (whole Mac) | Yes, per item | No |
A Note on Safe vs. Unsafe Deletion
Disk cleanup is permanent. Unlike moving a file to Trash, many cleaning operations bypass the Trash entirely. A few firm rules:
- Never delete anything inside
/System,/usr, or/private/etcunless a specific, trusted guide tells you to. - Be cautious with
~/Library/Application Support. Removing the wrong subfolder can wipe saved game progress, app preferences, or local databases. - Caches are the safest target. The folders
~/Library/Cachesand/Library/Cachesare designed to be expendable. Apps rebuild them automatically. - Test before bulk-removing. If you're unsure about a folder, search its name online or use an 'Is this safe to delete?' feature before committing.
If you're about to free up a significant amount of space, make sure you have a Time Machine backup or another backup current before you start.
Quick Reference: Folders to Inspect First
~/Library/Caches— Start here; low risk.~/Library/Developer/Xcode— Only if you use Xcode; can be very large.~/Downloads— Old installers and archives accumulate here.~/Library/Application Support— Inspect per-app, never bulk-delete.- Trash — Empty it if you haven't recently.
Conclusion
Finding the biggest files and folders on your Mac doesn't require Terminal expertise. The built-in Storage overview gives you a starting point, Finder's sort-by-size covers individual folders, and a disk visualization tool fills in the full recursive picture when you need it. Wherever you look, take a moment to understand what a folder is before removing it — the space savings are only worthwhile if nothing breaks afterward.