What cache is and why clearing it helps

Cache is temporary data your computer stores to load programs and websites faster the next time you use them. Your browser saves images and page layouts. Windows saves recently used files. Applications store settings and temporary work files. Over time, this cache builds up and takes up disk space, which can slow your system down.

Clearing cache regularly frees up storage and can improve performance, especially if your hard drive is nearly full. It also removes outdated data that programs no longer need. You do not lose any permanent files when you clear cache — only temporary copies that your computer can rebuild if needed.

Key Takeaways

  • Browser cache lives in your user folder and can be cleared through your browser settings in under a minute.
  • Windows temporary files accumulate in the Temp folder and can be deleted through Disk Cleanup or manually.
  • Each process may store its own cache in hidden folders, but clearing browser and system cache handles most of the buildup.
  • You can set your browser to clear cache automatically when you close it, so you do not have to do it manually.
  • Clearing cache is safe and will not delete your passwords, bookmarks, or any files you created yourself.

Clear cache in Chrome, Firefox, Edge, or Safari

Your web browser stores the most cache on your system. In Chrome, click the three-dot menu in the top right, select Settings, then Privacy and Security. Click Clear Browsing Data. A window opens with options for what to delete — select Cached Images and Files, choose the time range (All Time clears everything), and click Clear Data.

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

In Microsoft Edge, click the three-dot menu, select Settings, then Privacy, Search, and Services. Under Clear Browsing Data, click Choose What to Clear. Select Cached Images and Files and click Clear Now.

In Safari on Mac, click Safari in the menu bar, select Empty Cache, and confirm. On iPhone or iPad, go to Settings, scroll to Safari, tap Clear History and Website Data, and choose the time range.

Delete Windows temporary files

Windows stores temporary files in a folder that accumulates junk over time. The fastest way to clear these is through Disk Cleanup. Press the Windows key, type Disk Cleanup, and open the tool. Select your main drive (usually C:) and click OK. The tool scans and shows you what can be deleted.

Check the boxes next to Temporary Files, Recycle Bin, and Temporary Internet Files. You can also select Downloaded Program Files and other items if you recognize them. Click Delete Files to remove them. This usually frees up several hundred megabytes to a few gigabytes, depending on how long it has been since you last cleaned.

If Disk Cleanup does not appear or you want more control, you can delete files manually. Press Windows key + R, type %temp%, and press Enter. A folder opens showing temporary files. Select all (Ctrl + A), delete them (Delete key), and confirm. Some files may be locked by running programs — skip those and delete what you can.

Set your browser to clear cache automatically

Rather than clearing cache manually every few weeks, you can tell your browser to do it when you close it. In Chrome, go to Settings > Privacy and Security > Clear Cookies and Other Site Data When You Quit and toggle it on. You can choose what gets cleared by clicking Manage Exceptions.

In Firefox, go to Settings > Privacy & Security, scroll to Cookies and Site Data, and check Delete Cookies and Site Data When Firefox Is Closed. In Edge, go to Settings > Privacy > Clear Browsing Data and toggle Clear Browsing Data When Closing the Browser on.

This approach keeps your cache from building up without requiring you to remember to clear it. The tradeoff is that websites will load slightly slower the first time you visit them after closing your browser, because the cache is gone. For most users, the performance gain from less clutter outweighs this small slowdown.

Clear cache in specific applications

Beyond your browser and Windows, individual programs store their own cache. Spotify stores downloaded songs and artwork. Steam stores game files and updates. Microsoft Office stores recent documents and formatting data. Most applications have a cache-clearing option buried in Settings or Preferences.

In Spotify, go to Settings > Storage and click Delete Cache. In Steam, go to Settings > Downloads > Clear read Cache. In Microsoft Office, go to File > Account > Sign Out, then sign back in — this clears the local cache. For other programs, check the Help menu or search the program name plus "clear cache" to find the exact steps.

You do not need to clear process cache as often as browser cache, since most programs manage their own storage better. Focus on browser and Windows cache first, then tackle individual applications only if you are running low on disk space.

How much space you can expect to free up

Browser cache typically takes up 100 megabytes to 2 gigabytes, depending on how much you browse and how long since you last cleared it. Windows temporary files can range from 500 megabytes to several gigabytes. process cache varies widely — Steam can hold 10 to 50 gigabytes of game data, while Spotify might hold 1 to 5 gigabytes of music.

If your hard drive has less than 10 percent free space, clearing cache can noticeably improve performance. If you have 20 percent or more free, the speed improvement will be smaller but still worth doing as part of regular maintenance. Check how much space you have free by right-clicking your main drive, selecting Properties, and looking at the Free Space number.

What not to delete when clearing cache

When you clear cache, be careful not to delete things you actually need. In your browser's clear data window, do not check Cookies and Site Data unless you want to log out of every website — cache and cookies are different, and cookies store your login information. Do not check Passwords unless you want to forget saved passwords.

In Windows Temp folder, avoid deleting files that are currently in use by running programs. If a file is locked, Windows will not let you delete it anyway, so just skip it and move on. Do not delete anything from Program Files or Windows System folders — only delete from the Temp folder and your browser cache.

Clearing cache is safe because it only removes temporary copies. Your actual files, photos, documents, and settings stay intact. The worst that happens is a program loads slightly slower the next time you use it while it rebuilds its cache.

Frequently Asked Questions

Will clearing cache delete my passwords and bookmarks?

No. Passwords and bookmarks are stored separately from cache. When you clear cache in your browser, uncheck Cookies and Site Data to keep passwords. Bookmarks are never affected by cache clearing. If you want to keep everything except cached images and files, select only that option in the clear data window.

How often should I clear my cache?

If you browse heavily or your drive is nearly full, clear cache monthly. If you have plenty of free space and browse lightly, clearing every few months is fine. The easiest approach is to set your browser to clear cache automatically when you close it, so you never have to think about it.

Can clearing cache fix a slow computer?

It can help if your drive is nearly full, since cache takes up space. If you have plenty of free storage, clearing cache alone will not make a huge difference. Clearing cache works best as part of a broader maintenance routine that also includes removing unused programs and checking for malware.

What if I cannot delete files in the Temp folder?

Files locked by running programs cannot be deleted. Close any open programs and try again. If a file still will not delete, restart your computer and try when ready after startup, before programs have time to lock files. You can also use Disk Cleanup, which handles locked files better than manual deletion.

Is it safe to clear cache on my phone?

Yes. On iPhone, go to Settings > Safari > Clear History and Website Data. On Android, open your browser, go to Settings > Privacy, and select Clear Cache. Like on a computer, this removes temporary data but keeps your passwords and bookmarks intact.