To find large hidden files on a Mac, press Command + Shift + . (period) in Finder to reveal hidden items, open your User Library, and sort ~/Library/Caches and ~/Library/Application Support by size. macOS hides thousands of system and app files by default, and when caches or logs grow out of control, that hidden layer is usually where the missing gigabytes have gone.
TL;DR
- Press Command + Shift + . in Finder to toggle hidden files on and off.
- Most hidden bloat lives in the User Library (
~/Library), not the system Library. - The two heaviest folders are usually Caches (safe to empty contents) and Application Support (safe only for uninstalled apps).
- If Library is small but storage is still full, the cause is local Time Machine snapshots or purgeable iCloud caches, not hidden files.
- Never delete Library items you do not recognize — they are live app state.
How do I show hidden files on a Mac?
Hidden files on macOS are files and folders whose names start with a dot (like .DS_Store) plus protected system and Library locations that Finder keeps out of view. The fastest way to reveal them is the built-in Finder shortcut, no app required:
- open Finder
- go to your Home folder or Macintosh HD
- press Command + Shift + .
Hidden files and folders appear as faded, semi-transparent items. Press the same shortcut again to hide them. Then switch Finder to List view (Command + 2) and click the Size column header to sort the heaviest items to the top.
Where do large hidden files actually live on a Mac?
Most hidden bloat on a Mac lives inside your User Library (~/Library), not the system library. To open it, click Go in the Finder menu bar, hold Option, then click the Library item that appears — the path is Macintosh HD › Users › [you] › Library.
| Hidden folder | What it holds | Safe to clear? |
|---|---|---|
~/Library/Caches |
Temporary files apps can rebuild | Yes — empty the contents, keep the folder |
~/Library/Application Support |
Per-app data and settings | Only for apps you have uninstalled |
~/Library/Logs |
Diagnostic logs | Yes — usually safe to clear |
~/Library/Containers |
Sandboxed app data | No — deleting can corrupt app state |
Emptying the contents of Caches is safe because apps regenerate them; deleting the Caches folder itself is not. For Application Support, a large folder left behind by an app you removed is usually safe to delete.
Is it safe to delete hidden files on Mac?
Clearing the contents of ~/Library/Caches and ~/Library/Logs is safe — macOS and your apps rebuild those files automatically, and your documents, photos, and account logins are untouched. What is not safe is deleting random items you do not recognize inside Library, especially in Containers or the system /Library. Those are real, live app state, and guessing wrong can stop an app from launching. The rule: empty caches and logs freely, remove leftover folders only for apps you have actually uninstalled, and leave everything else alone.
What if the missing space is not in Library?
If your User Library is small but your Mac still reports huge "System Data" (formerly "Other") usage, the cause is usually not hidden files at all. The two most common culprits are local Time Machine snapshots, which macOS keeps on the internal drive until space is needed, and purgeable iCloud caches from Optimize Mac Storage. Both are managed by macOS and will not show up cleanly as files you can delete in Finder. Open Apple menu › System Settings › General › Storage to see the breakdown before assuming a hidden file is to blame.
FAQ
What is the keyboard shortcut to show hidden files on Mac?
In Finder, press Command + Shift + . (period) to reveal hidden files and folders; press the same combination again to hide them. It works in any Finder window and on the Desktop.
Is it safe to delete the Library Caches folder on Mac?
It is safe to delete the contents of ~/Library/Caches because apps rebuild cache files automatically, but do not delete the Caches folder itself. Your documents, photos, and logins are not stored there.
Why is my Mac storage full when I cannot find large files?
The space is usually held by hidden caches, local Time Machine snapshots, or purgeable iCloud files counted as "System Data." Reveal hidden files first, then check System Settings › General › Storage for snapshot and purgeable usage.
What does ~/Library/Application Support do?
~/Library/Application Support stores per-app data such as settings, plugins, and saved state. Deleting a folder there for an app you still use can reset or break it; deleting leftovers from uninstalled apps is generally safe.
The same hidden-clutter problem hits phones even harder, where caches and forgotten downloads quietly eat storage. If your iPhone or Android is the device that is actually full, see why your iPhone storage is full or what is taking up space on Android, learn why cached files take up space, and check what's using iPhone storage. For a full mobile cleanup workflow, start at the clean up phone storage hub, and to reclaim space automatically without hunting through folders, try Cleanor for iPhone.