What cache is and why you might clear it

Cache is temporary data that 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 download them again the next time you visit. Your Mac also caches data for apps, system files, and cloud services. Over time, this cache can take up gigabytes of storage space or occasionally cause an app to behave oddly if the cached data becomes corrupted.

Clearing cache won't harm your Mac or delete anything important. The worst that happens is websites take a few seconds longer to load the first time you visit them after clearing. Most people clear cache to free up storage space, fix a misbehaving app or website, or remove browsing history they don't want stored locally.

Key Takeaways

  • Browser cache clears through each browser's own settings — Safari, Chrome, and Firefox each have different menus to access this.
  • System cache on your Mac can be cleared through Finder by navigating to Library folders, though most users don't need to do this.
  • Clearing cache in Safari takes about 30 seconds and removes website data from the past week, month, or all time depending on what you choose.
  • Third-party cleaning apps can clear multiple types of cache at once, but built-in browser and system tools are sufficient for most people.

Clearing cache in Safari

Open Safari and click Safari in the menu bar at the top of your screen. Select Clear History from the dropdown menu. A window will appear asking how far back you want to clear — choose all history to remove everything, or pick a specific time range like the last hour or today.

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 clear the cache immediately, and you'll notice the button disappear once it's done.

Clearing cache in Chrome

Open Chrome and click the three vertical dots in the top right corner. Select Settings from the menu. On the left side, click Privacy and security, then click Clear browsing data.

A window will open with several options. At the top, use the dropdown menu to select your time range — All time will clear everything. Make sure Cookies and other site data and Cached images and files are both checked. Click Clear data to finish. Chrome clears the cache in a few seconds.

Clearing cache in Firefox

Open Firefox and click the hamburger menu (three horizontal lines) in the top right corner. Select Settings. On the left, click Privacy & Security. Scroll down to the Cookies and Site Data section and click Clear Data.

A popup will appear. Make sure both Cookies and Site Data and Cached Web Content are checked. Click Clear to remove the cache. If you want to clear only cached files without removing cookies, uncheck the cookies option before clicking clear.

Clearing system cache on your Mac

System cache is different from browser cache — it's temporary data your Mac creates for apps and system processes. Most of this clears automatically, and you rarely need to clear it manually. If you want to, open Finder and press Command + Shift + G to open the "Go to Folder" dialog. Type ~/Library/Caches and press Enter.

You'll see folders for individual apps and services. You can delete specific app caches by dragging them to the Trash, but do not delete system folders you don't recognize. Empty the Trash afterward. If an app is running, close it first before deleting its cache folder, or the app may recreate it immediately.

A simpler alternative is to restart your Mac, which clears much of the temporary cache automatically. If an app is behaving strangely, restarting often fixes the problem without you having to manually delete anything.

Using third-party cleaning apps

Apps like CleanMyMac, AppCleaner, and Disk Diag can clear cache across multiple apps and browsers at once. These tools scan your Mac, identify cache and temporary files, and delete them with a single click. They're useful if you want to clear cache from many sources without opening each app's settings individually.

Most cleaning apps are free or cost between $10 and $40. The trade-off is that they require you to grant them permission to access your files, and some include extra features you may not need. For most people, clearing browser cache through Safari, Chrome, or Firefox settings is enough — you only need a third-party app if you regularly clear cache from many different sources.

When to clear cache and how often

Clear browser cache when a website isn't loading correctly, when you want to remove your browsing history, or when you need to free up storage space on your Mac. There's no set schedule — some people clear it weekly, others only when they notice a problem. If your Mac is running slowly or storage is nearly full, clearing cache is a quick way to reclaim space without losing important files.

If you share your Mac with other people and want to remove your browsing history, clearing cache also removes cookies that store login information and preferences. Keep in mind that clearing cache will log you out of most websites, so you'll need to sign back in the next time you visit them.

Frequently Asked Questions

Will clearing cache delete my saved passwords?

No. Passwords are stored separately from cache in your browser's password manager. Clearing cache removes temporary website data, cookies, and browsing history, but not passwords. You'll stay logged into most sites unless you specifically clear cookies and site data.

How much storage space does cache usually take up?

Browser cache typically ranges from 100 megabytes to several gigabytes depending on how much you browse and how long it's been since you last cleared it. System cache is usually smaller, between 100 megabytes and 1 gigabyte. If your Mac is low on storage, clearing cache can free up meaningful space.

Can I clear cache automatically on a schedule?

Safari, Chrome, and Firefox all have settings to clear cache automatically when you close the browser. In Safari, go to Preferences and check "Remove history items" set to "after one day" or another interval. Chrome and Firefox have similar options in their privacy settings.

What's the difference between clearing cache and clearing cookies?

Cache stores files like images and scripts to make websites load faster. Cookies store information about your preferences, login status, and browsing behavior. Clearing both removes temporary data and resets your browsing state, but you can clear one without the other if you prefer.