~/Library is Where Your Mac Storage Goes to Hide

There's a folder on your Mac that Apple hides by default. It's called ~/Library, and it's often where 50-100GB of your "missing" storage actually lives.

We've helped clean up many Macs over the years. The story is usually the same: the user has 20GB of documents, 30GB of apps, and somehow their 256GB drive is full. The answer is almost always in ~/Library.

How to Find the Hidden Library

In Finder, click Go in the menu bar, then hold the Option (⌥) key. A "Library" option appears. Click it.

Or use Cmd + Shift + G and type ~/Library.

The Three Cache Folders That Matter Most

1. ~/Library/Caches

This is the big one. Every app on your Mac dumps temporary files here. Chrome, Slack, Spotify, Discord—they all cache aggressively and rarely clean up after themselves.

This folder can easily grow to 20GB+ on a Mac that's been in use for a year.

Can you delete the contents? Yes. Select everything inside the Caches folder (not the folder itself) and move to trash. Apps will rebuild what they need. You might see slightly slower load times for a day.

2. ~/Library/Application Support

This is where apps store their settings and data. You can't safely delete everything here, but it's worth checking for leftovers.

What to look for: Folders for apps you've already uninstalled. macOS doesn't always clean these up. Common examples:

• MobileSync/Backup – iPhone backups (can be 50GB+ each)
• Steam – downloaded games
• Folders from apps you deleted months ago

3. ~/Library/Group Containers

This is where sandboxed apps share data. Microsoft Office lives here (UBF8T346G9.Office), along with Outlook's email database.

If you don't use Outlook anymore but it's still installed, this folder might hold a large database you don't need.

The Problem with Manual Hunting

Honestly, poking through ~/Library in Finder is tedious. There are dozens of subfolders with cryptic names. You click into one, see some files, back out, try another. It takes a long time.

This is exactly why we built DissectMac.

Instead of clicking through folders one by one, you see the entire ~/Library as a visual map. The biggest block is the biggest folder. Click it, see the path, reveal in Finder.

What NOT to Delete

If you see a folder in ~/Library and don't recognize the name, look it up first. Some things that look like junk are actually important:

• Anything with com.apple.* – system data, leave it alone
• Containers – sandboxed app data, may cause issues if deleted
• Any folder for apps you're actively using

When in doubt, move to Trash but don't empty it immediately. Use your Mac for a day. If nothing breaks, empty the trash.

Pro Tip

The fastest safe cleanup: delete the contents of ~/Library/Caches, restart your Mac, and see how much space you recovered. For most people, that's 5-15GB right there with minimal risk.

Map Your ~/Library with DissectMac →