What cache is and why you might clear it

Cache is temporary data your Mac stores to speed things up. When you visit a website, your browser saves images, scripts, and page layouts so the next time you visit, the page loads faster instead of downloading everything again. Your Mac also caches application data, system files, and temporary files from programs you use daily.

Over time, cache can accumulate and take up disk space — sometimes several gigabytes worth. Clearing cache won't break anything; your Mac will simply rebuild it as you use applications and browse. People clear cache to free up storage, troubleshoot a program that's misbehaving, or remove data from websites you no longer want stored locally.

Key Takeaways

  • Browser cache lives in your web browser's settings and can be cleared in a few clicks without affecting your bookmarks or passwords.
  • Application cache is stored in the Library folder, which is hidden by default but can be accessed through Finder with a keyboard shortcut.
  • System cache in macOS accumulates in specific folders and can be safely deleted, though your Mac will rebuild it automatically.
  • Clearing cache frees up disk space and can fix problems like slow loading or outdated content, but does not delete your browsing history or saved passwords unless you choose to.

Clear cache in Safari, Chrome, or Firefox

Each browser stores cache differently, but all three let you clear it from their settings menu. In Safari, go to History in the menu bar, select "Clear History," choose how far back you want to clear (the dropdown offers options like "the last hour" or "all history"), and click Clear History. Safari will ask whether you want to remove history, cookies, and cache — select all three if you want a complete wipe.

In Google Chrome, click the three-dot menu in the top right, select Settings, go to Privacy and Security, click "Clear Browsing Data," and choose your time range at the top. Make sure "Cookies and other site data" and "Cached images and files" are checked, then click Clear Data. In Firefox, click the menu button (three horizontal lines), select Settings, go to Privacy & Security, scroll to Cookies and Site Data, and click "Clear Data." Check both boxes and click Clear.

None of these steps will delete your saved passwords, bookmarks, or browsing history unless you specifically check those boxes. If you only want to clear cache and not cookies, uncheck the cookies option before clicking Clear.

Clear application cache from the Library folder

Applications store their own cache in a hidden folder called Library. To access it, open Finder, click the Go menu at the top, hold down the Option key on your keyboard, and Library will appear in the dropdown. Click it. You are now in your user Library folder.

Navigate to Library > Caches. This folder contains cache files for every application on your Mac. You can delete the entire Caches folder if you want, or delete cache for specific apps — for example, the folder named com.google.Chrome contains Chrome's cache. Select what you want to delete, press Command+Delete, and move it to Trash. Empty your Trash afterward to permanently remove the files.

If an application is running when you try to delete its cache, close the application first. Some cache files may be locked or in use, and your Mac will skip those — that is normal and safe.

Clear temporary files and system cache

Your Mac also stores temporary files in /var/tmp and /var/folders. These accumulate over time and can be safely deleted. Open Finder, click Go, hold Option, and select Library again. Navigate to Library > Caches and delete the entire folder if you want a thorough cleanup. You can also go to Library > Logs and delete old log files, though these take up less space.

A faster way to handle system cache is to use a third-party tool like CleanMyMac X or Disk Diag, which scan for cache and temporary files and let you delete them in one click. These tools are not required — you can always delete manually — but they save time if you clear cache regularly.

After clearing cache, your Mac may run slightly slower for a few minutes as applications rebuild their cache files. This is temporary and normal. Restart your Mac if you want to speed up the process.

When to clear cache and what to expect

Clear browser cache if a website is showing outdated content, a page is loading slowly, or you want to free up disk space. Clear application cache if a program is crashing, freezing, or behaving strangely. Clear system cache if your Mac is running low on storage or if you have not cleared cache in several months.

After clearing cache, websites will load slightly slower the first time you visit them because your browser has to download all the files again. Subsequent visits will be fast again as new cache builds up. Applications may also take a moment longer to launch the first time after clearing their cache. This slowdown lasts only a few seconds and is not permanent.

Clearing cache does not delete your browsing history, saved passwords, autofill information, or any files you created. It only removes temporary data that your Mac and applications stored to speed things up.

Frequently Asked Questions

Will clearing cache delete my passwords or bookmarks?

No. Cache is separate from passwords and bookmarks. If you want to keep your passwords and bookmarks but clear cache, uncheck the "Cookies and site data" and "Passwords" boxes in your browser's clear data menu. Only check "Cached images and files."

How much space does cache usually take up?

Browser cache typically ranges from 100 MB to 2 GB depending on how much you browse. Application cache varies widely — some apps store very little, others store several hundred megabytes. System cache can be several gigabytes on a Mac that has not been cleared in a year or more.

Is it safe to delete everything in the Library Caches folder?

Yes. The Caches folder contains only temporary data that your Mac will rebuild automatically. Deleting the entire folder is safe and will not damage your system or applications. Close all applications first to avoid conflicts.

Do I need to clear cache regularly?

Not necessarily. Clearing cache is optional and only needed if you are low on storage, troubleshooting a problem, or concerned about privacy. If your Mac has plenty of free space and everything is working normally, you can leave cache alone.

What is the difference between cache and cookies?

Cache stores images, scripts, and page layouts to speed up loading. Cookies store login information, preferences, and tracking data. Both are temporary, but cookies contain more personal information. You can clear one without clearing the other.