The quick version: User caches in ~/Library/Caches and browser caches are safe to clear and commonly free 3 to 10 GB on a Mac that’s been running a year or more. System caches, protected by System Integrity Protection, should be left alone entirely. Clear user caches by deleting the contents of each app’s subfolder, clear browser caches from each browser’s own settings, then empty the Trash. CleanMyMac handles the identification step automatically if you’d rather skip the manual sorting.
The one rule that matters: user caches yes, system caches no
Nearly every cache-clearing question on a Mac comes down to one distinction. User caches, stored in ~/Library/Caches, belong to apps running under your account and rebuild themselves automatically. These are fair game. System caches, stored in /System/Library/Caches, are protected by System Integrity Protection and are essential to macOS functioning correctly. Never touch that folder manually. If you remember only one thing from this guide, it’s that distinction.
What a cache actually is
A cache is simply saved data an app keeps around so it doesn’t have to redo work. Your browser caches images so pages load faster the second visit. Apps cache thumbnails, previews, and downloaded assets. macOS itself caches fonts, icons, and system data. Deleting a cache is reversible in the sense that the app just rebuilds what it needs next time, though that also means you rarely reclaim as much lasting space as you might expect from a one-time clear.
Clearing user app caches safely
Quit any app whose cache you’re about to clear, since a running app may actively be using those files. In Finder, use Go, then Go to Folder, or press Shift-Command-G, and type ~/Library/Caches. The tilde matters here, it points to your personal Library rather than the system one. Inside, you’ll see folders named after individual apps and developers.
Open a folder and delete the files inside it, but leave the subfolder itself intact rather than deleting the whole parent folder. Apps that generate especially heavy caches include Adobe Creative Cloud tools, video editing software, AI chat apps, messaging apps like WhatsApp, and streaming or video conferencing tools, so those folders are often worth checking first if you’re hunting for the biggest wins.
Clearing browser cache the right way
Browser caches live inside each browser’s own data structure rather than in a simple Library folder, so clear these through the browser’s own settings rather than by digging through Finder. Every major browser has a Clear Browsing Data or Privacy settings screen for exactly this. Browser cache is also the lowest-risk category on this entire list, since it’s never essential to your Mac’s core stability.
What to leave completely alone
Beyond the protected system cache folder, be cautious about clearing cache for an app that’s currently open or actively syncing something, since interrupting that process mid-task can occasionally cause small glitches. If you’re ever unsure whether a folder is safe, a reasonable middle ground is moving it to a temporary location like your Desktop rather than deleting it outright, then confirming everything still works normally for a day before emptying the Trash for good.
Finish by emptying the Trash
Deleted cache files still occupy disk space until the Trash is emptied. Once you’re confident nothing broke, empty it to actually reclaim the space you just cleared.
Why this feels like it needs repeating every few months
Because it does. Caches exist specifically to speed up things you do repeatedly, so any app you keep using will simply rebuild its cache over time. Clearing it periodically is routine maintenance rather than a permanent fix, similar to how emptying a recycling bin doesn’t stop you from generating more recycling.
If sorting through folders by hand isn’t for you
Manually identifying which cache folders are worth clearing, and confirming you’re not touching anything protected, takes real attention to detail. CleanMyMac’s Cleanup module identifies safe user caches automatically as part of its scan, distinguishing them from system files it won’t touch, and shows you the full list before removing anything. In testing, it correctly separated genuinely stale caches from active app data without requiring any manual folder-hunting. You can download CleanMyMac and run a free scan to see exactly how much cache is safely reclaimable on your own Mac.
Frequently asked questions
Is it safe to clear the cache on a Mac?
User caches in ~/Library/Caches and browser caches are safe to clear, since apps and browsers rebuild them automatically. System caches in /System/Library/Caches are protected and should never be touched manually.
How much space does clearing cache actually free up?
On a Mac used for a year or more, cached files commonly account for 3 to 10 GB, sometimes more for heavy browser users or developers.
Will clearing cache break my apps?
No, as long as you stick to user caches and delete subfolder contents rather than system-level files. Apps simply rebuild their cache next time they run.
Why does an app’s cache keep growing back?
That’s expected. Caches speed up repeated tasks, so any app you keep using will rebuild its cache over time. Clearing it periodically is normal maintenance.
