What cache is and why you might want to clear it

Cache is temporary data your Mac stores to make things load faster. When you visit a website, your browser saves images, scripts, and other files so it doesn't have to read them again the next time you visit. Your Mac also caches data for apps, system processes, and cloud services. Over time, this cache can take up gigabytes of storage space, slow down your computer, or cause websites to display outdated versions of pages.

Clearing cache won't break anything — your Mac will straightforward re-read what it needs the next time you use an app or visit a website. The main reasons to clear cache are to free up storage space, fix a website or app that's behaving strangely, or remove data from your browser for privacy reasons.

Key Takeaways

  • Browser cache lives in your web browser's settings and can be cleared in a few clicks without affecting your passwords or bookmarks.
  • System cache on your Mac accumulates in hidden folders and can be cleared using the Finder or a third-party tool, though most users don't need to do this often.
  • Clearing cache frees up storage space and can fix websites or apps that load incorrectly, but your Mac will work normally afterward — nothing is permanently deleted that you need.
  • Different browsers store cache in different locations, so you'll need to clear it separately in Safari, Chrome, Firefox, or Edge if you use more than one.

How to clear browser cache in Safari

Safari is the default browser on Mac, and clearing its cache takes about 30 seconds. Open Safari, then click Safari in the menu bar at the top of the screen. Select Clear History from the dropdown menu. A window will appear asking how far back you want to clear — choose All History to clear everything, or pick a specific time range like The last hour or Today.

By default, Safari clears history, cookies, and cache all at once when you use this menu. If you want more control over what gets deleted, you can go to Safari > Settings > Privacy instead and click Manage Website Data to see individual websites and remove only the ones you want.

How to clear browser cache in Chrome, Firefox, and Edge

Chrome, Firefox, and Microsoft Edge all use similar steps. Open the browser, then use the keyboard shortcut Command + Shift + Delete to open the cache-clearing window directly. If that doesn't work, you can also go to the browser menu (the three dots or lines in the top corner), find Settings, then look for Privacy or Clear Browsing Data.

In the window that opens, you'll see a time range dropdown at the top — select All Time to clear everything, or choose a specific range. Make sure the box next to Cached Images and Files is checked. You can also check Cookies and Other Site Data if you want to clear those too, though this will log you out of most websites. Click the button to clear, and you're done.

How to clear system cache on your Mac

System cache is different from browser cache — it's temporary data your Mac creates for apps, system processes, and cloud services. This cache lives in hidden folders that aren't visible in Finder by default. Most users don't need to clear system cache regularly, but if your Mac is running slowly or you're running out of storage space, clearing it can help.

The safest way to clear system cache is to use Finder. Open Finder, then press Command + Shift + G to open the "Go to Folder" dialog. Type ~/Library/Caches and press Enter. This folder contains cache files for most of your apps. You can look through the folders inside and delete cache for specific apps, or select all and delete everything. Your Mac will recreate this cache as needed.

If you're not comfortable navigating hidden folders, you can also use a third-party app like CleanMyMac X or AppCleaner, which have graphical interfaces that make it easier to see what you're deleting. These apps are not free, but they show you exactly what cache they're removing before you confirm.

What happens after you clear cache

After you clear cache, websites and apps will work normally — they'll just take slightly longer to load the first time you use them after clearing, because your Mac has to re-read the cached files. This slowdown is temporary and usually not noticeable. Your passwords, bookmarks, and saved form data are not affected by clearing cache, so you won't be logged out of most sites unless you specifically cleared cookies at the same time.

If you cleared cache because a website or app was behaving strangely, you should see the problem fixed the next time you use it. If the problem persists, the issue is likely something else — try restarting your Mac or the app itself.

When you should and shouldn't clear cache

Clear your browser cache if you're selling or giving away your Mac and want to remove browsing history, if a website is displaying an old version of a page, or if you're running low on storage space. You can also clear cache regularly for privacy — some people clear it weekly or monthly to limit what data websites can track about them.

You don't need to clear cache constantly. Clearing it every few months is fine for most people. If you clear cache too often, you'll actually slow down your browsing because your Mac has to re-read the same files repeatedly. System cache also doesn't usually need clearing unless your Mac is running very slowly or you're critically low on storage space.

Frequently Asked Questions

Will clearing cache delete my passwords or bookmarks?

No. Cache is separate from passwords and bookmarks. Clearing cache only removes temporary files. If you want to remove passwords or bookmarks, you have to delete those separately in your browser settings. Some cache-clearing tools ask whether you want to clear cookies at the same time — if you say yes to that, you'll be logged out of websites, but your saved passwords usually stay.

How much storage space does cache actually take up?

Browser cache typically ranges from 100 MB to several gigabytes, depending on how many websites you visit and how long it's been since you cleared it. System cache can be larger. If you're running low on storage, clearing cache can free up 1 to 5 GB or more, though the exact amount varies by how much cache has accumulated.

Is it safe to delete everything in the Caches folder?

Yes, it's safe. Your Mac will recreate any cache files it needs. The only downside is that apps will run slightly slower the first time you use them after clearing, while they rebuild their cache. Some apps might need to re-read large files, but nothing will break.

Do I need to clear cache on a new Mac?

No. A new Mac has very little cache. You only need to clear cache if you've been using your Mac for a while and want to free up space, or if something isn't working right. New Macs don't accumulate cache fast enough to cause problems in the first few weeks.

Can I set my browser to clear cache automatically?

Yes. In Safari, go to Settings > Privacy and look for an option to remove history automatically. In Chrome, Firefox, and Edge, go to Settings > Privacy and find the option to clear cache on exit. This way, your cache is cleared every time you close the browser without you having to do it manually.