What cache is and why clearing it helps

Cache is temporary data your computer stores to load things faster next time. When you visit a website, Windows saves images and files so the page opens quicker on your next visit. Your browser does the same thing. Over time, this cache builds up and takes up disk space — sometimes gigabytes of it — which can slow your computer down, especially if your hard drive is already crowded.

Clearing cache does not delete anything important. It only removes copies of things your computer can read again if it needs them. The original files stay where they are. After you clear cache, websites and programs may load slightly slower the first time you visit them again, but then they speed back up as new cache builds.

There are three main places cache lives on Windows: your browser, your Windows system files, and temporary files Windows creates while running. You can clear all three, and each one takes a different path.

Key Takeaways

  • Browser cache lives in your web browser settings and can be cleared in a few clicks without affecting your passwords or bookmarks.
  • Windows system cache can be cleared through Disk Cleanup, a built-in Windows tool that removes temporary files safely.
  • Clearing cache frees up disk space and can improve performance, especially if your hard drive is nearly full.
  • You can set your browser to clear cache automatically every time you close it, so you do not have to remember to do it manually.

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

Your web browser stores the most cache, and it is the easiest to clear. The steps are nearly identical across Chrome, Firefox, and Microsoft Edge.

In Chrome: Click the three vertical dots in the top right corner. Select "Settings." Click "Privacy and security" on the left side. Click "Clear browsing data." A window will pop up. Make sure "Cached images and files" is checked. At the top, choose the time range — "All time" clears everything, or pick a specific range like "Last 7 days." Click "Clear data."

In Firefox: Click the three horizontal lines in the top right. Select "Settings." Click "Privacy & Security" on the left. Scroll down to "Cookies and Site Data." Click "Clear Data." Check "Cached Web Content." Click "Clear."

In Microsoft Edge: Click the three dots in the top right. Select "Settings." Click "Privacy, search, and services" on the left. Under "Clear browsing data," click "Choose what to clear." Check "Cached images and files." Click "Clear now."

Using Windows Disk Cleanup to remove system cache

Windows itself stores cache in temporary files that pile up over time. The safest way to clear this is Disk Cleanup, a tool built into Windows that knows which files are safe to delete.

Open File Explorer and right-click on your C: drive (or whichever drive Windows is installed on). Select "Properties." Click "Disk Cleanup." Windows will scan and show you a list of file types it can delete. Check the boxes next to "Temporary files," "Recycle Bin," and "Temporary internet files." Do not check boxes for things you are unsure about. Click "OK," then "Delete Files" to confirm.

This usually frees up several hundred megabytes to a few gigabytes, depending on how long it has been since you last cleared cache. The process takes a few minutes.

Clearing cache through Windows Settings

Windows 10 and 11 also have a cache-clearing option built into Settings. Open Settings by pressing the Windows key and typing "Settings," then press Enter. Click "System" on the left. Click "Storage." Scroll down and click "Temporary files." Windows will show you what it found. Check the boxes next to items you want to delete — "Temporary files," "Recycle Bin," and "Downloads" are usually safe. Click "Remove files."

This method is simpler than Disk Cleanup but shows you less detail about what is being deleted. Both methods are safe and will not harm your system.

Setting your browser to clear cache automatically

You can tell your browser to clear cache every time you close it, so you never have to think about it again.

In Chrome: Go to Settings, then "Privacy and security." Click "Clear browsing data." Check the box that says "Clear cookies and other site data when you quit Chrome." From now on, cache clears automatically when you close the browser.

In Firefox: Go to Settings, then "Privacy & Security." Scroll to "Cookies and Site Data." Check the box that says "Delete cookies and site data when Firefox is closed."

In Microsoft Edge: Go to Settings, then "Privacy, search, and services." Scroll down to "Clear browsing data." Toggle on "Choose what to clear every time you close the browser." Then click "Choose what to clear every time you close the browser" and check "Cached images and files."

Turning this on means your browser will not remember your login information between sessions unless you tell it to. Most people find this a fair trade for the automatic cleanup.

What cache clearing will and will not do

Clearing cache will free up disk space and may speed up your computer if your hard drive is very full. It will not delete your passwords, bookmarks, browsing history, or any files you created. Those are stored separately from cache.

If your computer is still slow after clearing cache, the problem is likely something else — too many programs running at startup, a hard drive that is failing, or malware. Clearing cache is one step in keeping your computer running smoothly, but it is not a cure-all.

Cache will start building up again when ready after you clear it. This is normal and expected. You do not need to clear it more than once a month unless you are running very low on disk space.

Frequently Asked Questions

Will clearing cache delete my passwords?

No. Passwords are stored separately from cache. If you want to keep your passwords but clear cache, make sure "Cookies and other site data" is unchecked when you clear browsing data. Cache and cookies are different things, though browsers often let you clear them together.

How much space will clearing cache free up?

It depends on how much you browse and how long it has been since you last cleared cache. Most people see 500 megabytes to 2 gigabytes freed up. If you have not cleared cache in years, it could be more. Check the Disk Cleanup preview before you delete to see the exact amount.

Is it safe to clear cache?

Yes. Cache is temporary data that your computer can recreate. Clearing it will not break anything. The only downside is that websites may load slightly slower the first time you visit them after clearing, because your browser has to read the files again.

Do I need to clear cache if I do not notice my computer is slow?

Not necessarily. If your computer is running fine and you have plenty of free disk space, clearing cache is optional. It is most useful if your hard drive is nearly full or if you have not cleared it in a long time.

What is the difference between cache and cookies?

Cache stores images, videos, and files to make websites load faster. Cookies store information about you — like login details and preferences — so websites remember you. You can clear them separately, though most browsers let you clear both at once.