What cache is and why clearing it helps

Cache is temporary data your MacBook stores to make things load faster. When you visit a website, your browser saves images and code so the next time you visit, it doesn't have to read everything again. Your Mac also caches data for apps, system processes, and cloud services. Over time, this cache can grow to several gigabytes and sometimes contains outdated or corrupted files that slow things down or cause apps to behave oddly.

Clearing cache won't delete your actual files, photos, or documents — only these temporary copies. It's safe to do regularly, and many people find their Mac runs noticeably faster afterward. The tradeoff is that websites and apps will take slightly longer to load the first time you use them after clearing cache, because your Mac has to read fresh copies.

Key Takeaways

  • Browser cache lives inside Safari, Chrome, or Firefox and is the fastest type to clear — it takes under a minute and won't affect your files.
  • System cache in the Library folder requires you to show hidden files, but clearing it can free up several gigabytes of space.
  • App cache is stored separately for each process and can be cleared without uninstalling the app itself.
  • Restarting your Mac after clearing cache helps it rebuild only the cache it actually needs.

Clearing cache in Safari

Open Safari and click Safari in the menu bar at the top left. Select Clear History from the dropdown menu. A window will appear asking how far back to clear — choose All History to remove everything, or pick a specific timeframe like "the last day" or "the last week" if you want to keep some recent cache.

Make sure the checkbox next to Cookies and other website data is checked. This removes the cached files that websites store on your Mac. Click Clear History to finish. Safari will close and reopen, and your cache is now cleared.

Clearing cache in Chrome or Firefox

In Chrome, click the three vertical dots in the top right corner, then select Settings. On the left sidebar, click Privacy and security, then Clear browsing data. A window opens showing what will be deleted. Make sure Cached images and files is checked, set the time range to All time, and click Clear data.

In Firefox, click the menu button (three horizontal lines) in the top right, select Settings, then Privacy & Security on the left. Scroll down to Cookies and Site Data and click Clear Data. Check both Cookies and Site Data and Cached Web Content, then click Clear.

Clearing system cache from the Library folder

Your Mac's system cache is hidden by default. Open Finder and click Finder in the menu bar, then select Settings. Click the Advanced tab and check the box next to Show hidden files and folders. Close the settings window.

Now open Finder again and press Command + Shift + G to open the "Go to Folder" dialog. Type ~/Library/Caches and press Enter. You'll see folders for each app and system service. You can safely delete the contents of this folder — select all files by pressing Command + A, then press Command + Delete to move them to Trash. Empty your Trash afterward to free up the space.

If you want to clear cache for a specific app instead of everything, navigate to the same Caches folder and delete only the folder with that app's name. For example, delete the "Google Chrome" folder to clear only Chrome's cache, or the "Firefox" folder for Firefox.

Clearing cache for individual apps

Some apps store cache in their own settings rather than the Library folder. Open the app and look for Preferences, Settings, or Storage in the menu bar or app menu. Look for an option like Clear Cache, Clear Data, or Storage. Click it and confirm. This method varies by app, so if you don't see an obvious option, check the app's help menu or website.

For cloud services like Dropbox, Google Drive, or OneDrive, clearing cache usually means signing out and signing back in. Open the app, find your account settings, and look for a Sign Out or Log Out option. When you sign back in, the app will read a fresh copy of its cache.

What to do after clearing cache

Restart your MacBook after clearing cache. This gives your Mac a clean start and lets it rebuild only the cache it actually needs as you use apps and visit websites. You don't have to restart, but doing so often results in noticeably faster performance.

After restarting, open your most-used apps and websites. They may load slightly slower the first time because your Mac is downloading fresh cache, but subsequent visits will be fast again. This is normal and temporary.

When to clear cache and how often

Clear cache when your Mac feels slow, when an app is behaving strangely, or when you want to free up storage space. If you check your storage regularly, cache can account for 2 to 5 gigabytes or more, especially if you use many apps or browse frequently. Clearing it once a month is reasonable for most people; heavy users might do it every two weeks.

You can also clear cache automatically in some browsers. In Safari, go to Settings > Privacy and look for Remove history — set it to After one day or After one week to have Safari clear cache on its own schedule. Chrome and Firefox have similar options in their settings under Privacy or History.

Frequently Asked Questions

Will clearing cache delete my passwords or saved logins?

Not if you uncheck that option. When you clear cache in most browsers, you'll see checkboxes for different types of data. Leave Passwords and Autofill information unchecked if you want to keep them. Only check Cookies and Cached images and files to clear cache without losing login information.

Can I clear cache without restarting my Mac?

Yes, restarting is optional. Clearing cache works when ready whether you restart or not. Restarting just tends to make the performance improvement more noticeable because it gives your Mac a completely fresh start. If you're in the middle of work, clear cache and keep going — you don't have to restart.

What's the difference between clearing cache and emptying Trash?

Clearing cache removes temporary files your Mac and apps created automatically. Emptying Trash removes files you manually deleted. They're separate actions. You can clear cache without emptying Trash, and vice versa. Emptying Trash is what actually frees up space after you delete files.

Is it safe to delete everything in the Caches folder?

Yes, it's completely safe. Cache is designed to be deleted. Your Mac will recreate whatever cache it needs the next time you use an app or visit a website. The only downside is that things will load slightly slower the first time after clearing, until new cache builds up again.

How much space will clearing cache free up?

It varies depending on how much you use your Mac and how long it's been since you last cleared cache. Clearing browser cache typically frees 500 megabytes to 2 gigabytes. Clearing system cache can free 1 to 5 gigabytes or more. Check your storage before and after to see the actual difference on your machine.