What clearing your cache does and why you might do it

Cache is temporary data your browser and operating system store to load websites and programs faster. When you visit a website, your browser saves images, scripts, and page layouts so the next time you visit, it doesn't have to read everything again. Your computer's system cache works the same way for programs and files you use often.

Clearing cache frees up disk space, can speed up a sluggish browser, and removes data from websites you've visited. Some people clear it for privacy — deleted cache means fewer traces of where you've been. Others do it because a website isn't loading correctly and a fresh cache forces it to reload from scratch. You don't need to clear cache often; most people do it once every few months or when they notice their browser is slow.

Key Takeaways

  • Browser cache clears in your browser settings under History or Privacy, usually in under a minute, and you can choose to clear just the last hour or all time.
  • Windows users can clear system cache through Disk Cleanup or by deleting the Temp folder, which is safe and recovers gigabytes of space on older computers.
  • Mac users can clear cache through Safari settings or use the Library folder, though the process differs slightly from Windows.
  • Clearing cache does not delete your passwords, bookmarks, or saved login information unless you specifically check those boxes.
  • If a website looks broken after clearing cache, refresh the page once or twice to let it rebuild the cache from the live site.

Clearing browser cache in Chrome, Firefox, and Edge

The fastest way to clear cache is through your browser. In Chrome, click the three vertical dots in the top right, select Settings, then go to Privacy and Security on the left. Click Clear Browsing Data. A window opens with options: choose the time range (Last hour, Last 24 hours, Last 7 days, Last 4 weeks, or All time), check the box next to Cached Images and Files, and click Clear Data. The whole process takes about 30 seconds.

In Firefox, click the menu button (three horizontal lines) in the top right, select Settings, then Privacy and Security on the left. Scroll down to Cookies and Site Data and click Clear Data. Check Cached Web Content, make sure Cookies and Site Data is also checked if you want a thorough clear, and click Clear. In Microsoft Edge, click the three dots in the top right, select Settings, then Privacy, Search, and Services on the left. Under Clear Browsing Data, click Choose What to Clear, select your time range, check Cached Images and Files, and click Clear Now.

None of these steps delete your saved passwords or bookmarks unless you check those boxes. If you want to keep your login information but clear everything else, leave those boxes unchecked.

Clearing system cache on Windows

Windows stores temporary files in a folder called Temp that you can safely delete. Press the Windows key and R together to open the Run dialog, type %temp%, and press Enter. A folder window opens showing temporary files. Select all (Ctrl+A), delete them (Delete key), and confirm. Some files may be locked by programs running right now — Windows will skip those, which is fine. You can also close this folder and try again later if you want to delete locked files.

For a larger cleanup, use Disk Cleanup. Press the Windows key, type Disk Cleanup, and open it. Select your C: drive (or whichever drive your Windows is on), click OK, and wait for it to scan. A window shows what it found: check the boxes next to Temporary Files, Recycle Bin, and Temporary Internet Files, then click Delete Files. Disk Cleanup is safer than manual deletion because it only targets files Windows knows are safe to remove.

On older computers with a full hard drive, clearing these folders can recover several gigabytes of space and noticeably speed things up. On newer computers with plenty of free space, the speed difference is usually not noticeable.

Clearing cache on Mac

In Safari, click Safari in the menu bar at the top, select Settings, go to the Privacy tab, and click Manage Website Data. Select all the websites listed (or select specific ones), click Remove, and confirm. This clears Safari's cache. You can also go to History in the menu bar and click Clear History, then choose how far back to clear (Last hour, Today, Today and Yesterday, or All history).

For system-level cache on Mac, open Finder, click Go in the menu bar, hold Option, and click Library (it only appears when you hold Option). Navigate to Caches, and you'll see folders for individual programs. You can delete entire folders here, but only delete cache for programs you recognize. If you're not sure what a folder is, leave it alone — deleting the wrong cache can cause programs to behave oddly until they rebuild it.

A simpler approach for most Mac users is to restart your computer, which clears temporary cache automatically. If a program is running slowly, a restart often fixes it without needing to dig into the Library folder.

What happens after you clear cache

After clearing browser cache, websites will load slightly slower the first time you visit them because your browser has to read everything fresh. The second and third visits will be normal speed as the cache rebuilds. If a website looks broken or won't load after clearing cache, refresh the page (Ctrl+R on Windows, Command+R on Mac) once or twice — this forces the site to reload completely and usually fixes the problem.

Your passwords, bookmarks, and browsing history remain unless you specifically checked those boxes during the clear. If you only checked Cached Images and Files, nothing else changes. If you're concerned you deleted something important, most browsers let you recover recently closed tabs or restore your history from the previous day.

When to clear cache and when not to

Clear cache if your browser is slow, a website isn't displaying correctly, you want to free up disk space, or you're concerned about privacy. You don't need to clear it on a schedule — once every few months is typical. If you clear cache and a website when ready stops working, it's usually because the site relies on cached data to function, which is rare and usually a problem with the website, not your computer.

Do not clear cache if you're about to lose internet connection and want to keep websites available offline, or if you rely on cached data for a program you use. For most people, clearing cache is harmless and can solve common slowness problems without any downside.

Frequently Asked Questions

Will clearing cache delete my passwords and saved logins?

No, unless you check the box for Passwords or Saved Passwords during the clear. If you only clear Cached Images and Files, your passwords stay. If you accidentally cleared passwords, most browsers can restore them from your last backup or sync.

How much space does clearing cache usually free up?

Browser cache is usually 100 megabytes to 1 gigabyte depending on how long you've been using the browser. System cache on Windows can be several gigabytes on older computers. On newer computers with solid-state drives, the space savings are smaller but the speed improvement can still be noticeable.

Is it safe to delete files in the Temp folder on Windows?

Yes. The Temp folder is designed to hold temporary files that programs no longer need. Windows will not let you delete files that are currently in use, so you cannot break anything by trying. Some files may be locked, and that's fine — Windows skips them.

Do I need to clear cache before selling or giving away my computer?

Clearing browser cache removes some traces of websites you visited, but it does not fully erase your data. If you're selling the computer, use your operating system's full reset or wipe tool instead, which erases everything and reinstalls Windows or macOS fresh.

Why is my browser still slow after clearing cache?

Cache is one cause of slowness, but not the only one. If clearing cache doesn't help, try closing unused tabs, disabling browser extensions you don't use, or restarting your browser. If the whole computer is slow, restart it — that clears system cache and stops background programs that may be running.