What cookies are and why clearing them helps

Cookies are small files that websites store on your device to remember information about you — your login details, what you put in a shopping cart, sites you've visited. Most cookies are harmless, but some track your behavior across the internet to build a profile of your interests. Data brokers and advertisers buy this profile information to sell to other companies. Clearing your cookies regularly breaks some of these tracking chains and removes stored data that could be sold.

Clearing cookies won't make you invisible online, and it won't stop all tracking. But it does delete the record of where you've been and what you've done on individual websites. It's one part of a larger effort to reduce the personal information floating around about you.

Key Takeaways

  • Cookies are files websites store on your device; some track your behavior for advertisers and data brokers.
  • Clearing cookies removes stored browsing history and login information from your device, but does not affect what data brokers already collected.
  • The steps differ depending on whether you use Chrome, Firefox, Safari, or Edge, and whether you're on a computer or phone.
  • Clearing cookies regularly is more effective than clearing them once; setting your browser to clear them automatically when you close it is the simplest approach.

How to clear cookies in Chrome

On a computer, open Chrome and click the three vertical dots in the top right corner. Select "Settings," then click "Privacy and security" on the left side. Choose "Clear browsing data." A window will open with options for what to delete. Make sure "Cookies and other site data" is checked. At the top, select the time range — "All time" will clear everything, or you can choose "Last hour," "Last 24 hours," or "Last 7 days" if you want to keep some cookies. Click "Clear data."

On an Android phone, open Chrome and tap the three dots in the bottom right corner. Tap "Settings," then "Privacy and security," then "Clear browsing data." Check "Cookies and site data" and choose your time range. Tap "Clear data." On an iPhone, Chrome uses Apple's system settings, so you'll need to go to Settings > Chrome > Clear Browsing Data, check "Cookies, Site Data," and tap "Clear Browsing Data."

How to clear cookies in Firefox

On a computer, click the three horizontal lines in the top right corner and select "Settings." Click "Privacy & Security" on the left. Under "Cookies and Site Data," click "Clear Data." A box will appear — make sure "Cookies and Site Data" is checked and click "Clear." This clears all cookies at once.

On an Android phone, tap the three dots at the bottom right, go to "Settings," then "Delete browsing data." Check "Cookies" and tap "Delete." On an iPhone, go to Settings > Firefox > Clear Private Data, check "Cookies," and tap "Clear Private Data."

How to clear cookies in Safari

On a Mac, click "Safari" in the top menu and select "Settings." Go to the "Privacy" tab. Click "Manage Website Data" to see all stored cookies and site data. You can select individual websites and click "Remove," or click "Remove All" to clear everything at once.

On an iPhone or iPad, go to Settings > Safari > Clear History and Website Data. Choose the time period you want to clear — "the last hour," "today," "today and yesterday," or "all time." Tap "Clear History and Data." This removes cookies along with your browsing history.

How to clear cookies in Microsoft Edge

On a computer, click the three dots in the top right corner and select "Settings." Click "Privacy, search, and services" on the left. Under "Clear browsing data," click "Choose what to clear." A window will open — check "Cookies and other site data" and select your time range. Click "Clear now."

On an Android phone, tap the three dots at the bottom right, go to "Settings," then "Privacy." Tap "Clear browsing data," check "Cookies and site data," and tap "Clear data." On an iPhone, go to Settings > Edge > Clear Browsing Data, check "Cookies," and tap "Clear Browsing Data."

Setting your browser to clear cookies automatically

Instead of clearing cookies manually each time, you can set your browser to delete them automatically when you close it. In Chrome, go to Settings > Privacy and security > Cookies and other site data. Toggle on "Clear cookies and site data when you quit Chrome." In Firefox, go to Settings > Privacy & Security > Cookies and Site Data and check "Delete cookies and site data when Firefox is closed." In Safari, go to Settings > Privacy and uncheck "Prevent cross-site tracking" if you want stricter privacy, though this is separate from automatic cookie deletion — Safari doesn't have a built-in automatic clear-on-close option. In Edge, go to Settings > Privacy > Clear browsing data and toggle on "Choose what to clear every time you close the browser."

Automatic clearing is simpler than remembering to do it manually, but it means you'll be logged out of websites each time you close your browser. If that's inconvenient, clearing cookies weekly or monthly is a reasonable middle ground.

What clearing cookies does and doesn't do

Clearing cookies removes the record of your browsing from your device and stops websites from using stored cookies to track you going forward. It also deletes login information, so you'll need to sign back into accounts. However, clearing cookies does not erase information that data brokers already collected and stored on their own servers. If a data broker tracked your activity before you cleared your cookies, that historical data remains in their database.

Clearing cookies also doesn't prevent new tracking from starting. Once you clear them, websites and advertisers can begin collecting new cookies the moment you visit them again. For stronger privacy, consider using a browser extension that blocks tracking cookies, or use your browser's private or incognito mode, which doesn't store cookies after you close the window.

Frequently Asked Questions

Will clearing cookies log me out of everything?

Yes. Clearing cookies removes the login tokens websites use to keep you signed in. You'll need to log back into email, social media, banking, and other accounts. If you set your browser to clear cookies automatically when you close it, you'll be logged out every time you restart your browser.

Do I need to clear cache and browsing history too?

Cache and browsing history are separate from cookies. Cache stores images and files to load websites faster; browsing history is a list of sites you've visited. Clearing all three together removes more traces of your activity, but cookies are the main tool advertisers use to track you. You can clear them separately depending on what you want to remove.

Does clearing cookies stop data brokers from tracking me?

No. Clearing cookies stops websites from using stored cookies to recognize you, but data brokers use other methods too — your IP address, device fingerprinting, and information you enter directly. Clearing cookies is one step, but it doesn't stop all tracking. To reduce what data brokers collect, you'd also need to contact them directly to request removal of your information.

Is it safe to clear all cookies at once?

Yes, it's completely safe. Cookies are just small files; deleting them won't damage your device or browser. The main inconvenience is that you'll lose login information and websites may load slightly slower the first time you visit them after clearing, since they have to reload images and files from scratch.

What's the difference between clearing cookies and using private browsing?

Private or incognito mode prevents your browser from storing cookies, history, and cache while you're using it, but deletes everything when you close the window. Clearing cookies manually removes what's already stored. Private mode is useful for one-time browsing; clearing cookies regularly is better for ongoing privacy if you want to stay logged into some sites.