Hunting the giants: finding the files that ate your Mac's disk

Q: Can Finder show me total folder sizes?

Yes — right-click a folder and choose Get Info, or in list view open View → Show View Options → check Calculate all sizes. It can be slow on large directories.

Updated September 2026 · 7 min read

Your disk is almost full, but you have no idea what's taking up space. You've already emptied the Trash and deleted old downloads. Now what?

Before installing anything, try the tools your Mac already has. There are three built-in methods to find large files — each shows a different angle, and together they'll reveal where your gigabytes went.

Method 1: Storage settings breakdown

The fastest way to get an overview.

Open System Settings → General → Storage.
Wait for the bar to load — it can take a minute on a full disk.
You'll see categories: Apps, Documents, Photos, System Data, and more.
Click the ⓘ button next to any category to drill down.

The Documents section is particularly useful: it has tabs for Large Files, Downloads, and File Browser. The Large Files tab shows the biggest individual files on your disk, sorted by size. This alone often reveals forgotten downloads, old disk images (.dmg), or video files you didn't know were still around.

Tip: The "Large Files" tab doesn't search inside app libraries (Photos, iMovie, etc.) — those appear as single package files. For what's inside them, check the relevant category instead.

Method 2: Finder search with size filter

For more control than Storage settings offer.

Open a new Finder window and make sure you're searching This Mac (not a specific folder).
Press Cmd + F to open the search bar.
Click the + button to add a search criterion.
Change the first dropdown to File Size, set the operator to is greater than, and type a threshold — start with 500 MB or 1 GB.
Sort results by Size (click the column header).

This finds every file above your threshold, including ones inside your user Library that Storage settings may not show clearly. You can add more criteria — file type, date modified — to narrow things down.

Method 3: Terminal — when you want precision

If you're comfortable with Terminal, one command shows the biggest directories on your disk:

du -sh ~/* | sort -rh | head -20

This lists the 20 largest folders in your home directory, sorted by size. You can drill deeper into any folder:

du -sh ~/Library/* | sort -rh | head -20

The Library folder is where most hidden storage hogs live — caches, app support data, mail downloads.

For a detailed breakdown of what's inside Library and what's safe to clean, see our System Data guide.

What to do once you find them

Finding large files is the easy part. The hard part is deciding what to do with each one:

Old .dmg installer files — safe to delete. You can re-download apps if needed.
Videos and movies — only you know if you need them. Move to an external drive if unsure.
.zip and .tar archives — if you already extracted them, the archive is a duplicate of the contents. Safe to remove.
iOS backups — found in ~/Library/Application Support/MobileSync/Backup. If you use iCloud Backup on your iPhone, these local backups may be outdated.
Virtual machine files (.vmdk, .vdi) — each one is 20–100 GB. If you don't use the VM anymore, this is a huge win.

The golden rule: if you don't know what a file is, don't delete it. Move it to an external drive first. Wait a month. If nothing breaks and you never needed it, then delete the backup. This is especially important for anything in the Library folder.

What the built-in tools miss

These methods are great for individual files but less helpful for understanding patterns — like "how much total space do all my node_modules folders use?" or "which app's cache is the biggest?" For that kind of analysis, you need something that understands app-level context, not just file sizes.

Finding junk is tedious. Explaining it shouldn't be.

Gigatidy scans your Mac and tells you — in plain language — what's safe to remove and why. No digging through Library folders, no guessing whether a file matters.

Meet Gigatidy →

FAQ

Why does my disk say it's full but I can't find the big files?

The most common culprit is System Data — caches, Time Machine local snapshots, and app support files that don't show up as regular documents. Check System Settings → General → Storage for the category breakdown, and look at the System Data category specifically.

Is it safe to delete files from the Library folder?

It depends on the subfolder. Caches (~/Library/Caches) are generally safe — apps rebuild them. But Application Support, Preferences, and Containers hold app data you might need. When in doubt, move the file to an external drive instead of deleting it permanently.

Can Finder show me total folder sizes?

Yes — right-click a folder and choose Get Info to see its total size. For a list view with sizes, open Finder → View → Show View Options → check "Calculate all sizes." This makes Finder calculate folder sizes inline, though it can be slow on large directories.