What tracking cookies are and why they follow you
Tracking cookies are small files that websites and advertisers place on your computer to record what you do online. Unlike regular cookies that help a website remember your login or shopping cart, tracking cookies exist to build a profile of your browsing habits — what you search for, what you buy, what you read, how long you stay on a page. That profile gets sold to advertisers, data brokers, and marketing companies.
When you delete tracking cookies, you remove the record that links your browsing activity to your identity on that particular device and browser. This stops the most direct way advertisers follow you from site to site. It does not stop all tracking — companies also use pixels, fingerprinting, and login data — but it removes one of the easiest tools they use.
Deleting cookies is different from clearing your browsing history. History is what you visited; cookies are what companies stored on your machine to identify you. You can delete one without the other, though most people do both.
Key Takeaways
- Tracking cookies are files advertisers place on your computer to follow your browsing across different websites and sell that data to other companies.
- You can delete all cookies at once through your browser settings, or delete only tracking cookies by adjusting your privacy settings before you browse.
- Deleting cookies removes the record linking your activity to you on that device, but does not stop all forms of tracking like pixels or login-based tracking.
- Cookies return the moment you visit a new website, so deleting them is a one-time action unless you change your browser settings to block them going forward.
- The most effective long-term approach is to block third-party cookies in your browser settings rather than delete them repeatedly.
How to delete cookies in Chrome, Firefox, Safari, and Edge
The steps are similar across all major browsers. Open your browser, go to Settings or Preferences, find the Privacy or History section, and select the option to clear cookies. The exact names and locations differ slightly.
In Chrome: Click the three-dot menu in the top right, select Settings, then Privacy and Security, then Clear Browsing Data. A window appears with options for what to delete. Check the box next to Cookies and Other Site Data. At the top, choose the time range — select All Time to delete every cookie on your machine. Click Clear Data.
In Firefox: Click the menu button (three horizontal lines) in the top right, select Settings, then Privacy and Security. Scroll to Cookies and Site Data and click Clear Data. A window appears. Check both boxes: Cookies and Site Data and Cached Web Content. Click Clear.
In Safari: Click Safari in the menu bar at the top of the screen, then Settings. Go to the Privacy tab. Click Manage Website Data. Select all entries or select specific sites, then click Remove or Remove All. Click Done.
In Edge: Click the three-dot menu in the top right, select Settings, then Privacy, Search, and Services. Under Clear Browsing Data, click Choose What to Clear. Check Cookies and Other Site Data, set the time range to All Time, and click Clear Now.
The difference between deleting cookies and blocking them
Deleting cookies removes what is already on your computer. Blocking cookies stops new ones from being created in the first place. Blocking is more effective long-term because you do not have to remember to delete them repeatedly — they never accumulate.
Most browsers let you block third-party cookies, which are the ones advertisers use to track you across multiple websites. First-party cookies, which websites use to remember your login or preferences on their own site, are usually left alone because blocking them breaks website functionality.
In Chrome: Go to Settings, then Privacy and Security, then Cookies and Other Site Data. Select Block Third-Party Cookies. This is the default setting in newer versions of Chrome.
In Firefox: Go to Settings, then Privacy and Security. Under Enhanced Tracking Protection, select Strict. This blocks most tracking cookies by default.
In Safari: Go to Settings, then Privacy. Check the box next to Prevent Cross-Site Tracking. Safari also has an option to block all cookies, but this breaks many websites.
In Edge: Go to Settings, then Privacy, Search, and Services. Under Tracking Prevention, select Strict. This blocks third-party cookies and other tracking methods.
What happens after you delete cookies
Websites and advertisers can when ready start placing new tracking cookies on your computer the moment you visit them again. If you visit Facebook, Facebook places a cookie. If you visit a news site with an ad network, that ad network places a cookie. The deletion is a one-time action unless you change your settings to block them going forward.
Some websites may also ask you to log in again after you delete cookies, because the cookie that kept you logged in is gone. This is normal and expected. You can log back in, and the website will place a new cookie.
Deleting cookies does not affect your account passwords, saved payment methods, or other information stored on the website's servers. It only removes the files on your computer.
Why blocking is more practical than deleting
If you delete cookies once a month but do not block them, advertisers still collect 30 days of tracking data before you delete. If you block third-party cookies in your settings, that data is never collected in the first place. Blocking requires one change to your browser settings; deleting requires you to remember to do it repeatedly.
The tradeoff is that blocking third-party cookies can occasionally break website features — some sites use third-party cookies for legitimate purposes like embedded videos or live chat. If a site stops working after you block cookies, you can add that site to an exception list in your browser settings, allowing it to use cookies while blocking them everywhere else.
For most people, blocking third-party cookies in your browser settings is the most practical approach. It stops the majority of tracking without requiring ongoing action.
Other tracking methods cookies do not stop
Deleting or blocking cookies stops one tracking method, but companies use others. Pixels are invisible images embedded in websites and emails that report back to an advertiser when you view them. Fingerprinting identifies you based on your browser type, screen resolution, installed fonts, and other technical details — no cookie needed. Login-based tracking happens when you sign into Facebook, Google, or another service; those companies track you across the web even without cookies because you are logged in.
Blocking cookies is a useful step, but it is not a complete solution. For more comprehensive privacy, consider using a VPN to hide your IP address, using a privacy-focused search engine like DuckDuckGo instead of Google, and logging out of social media accounts when you are not actively using them.
Frequently Asked Questions
Do I need to delete cookies if I already block third-party cookies?
No. If you have blocked third-party cookies in your browser settings, new tracking cookies cannot be created. Deleting existing cookies is optional — it removes old data but does not prevent new tracking. Most people who block cookies do not need to delete them.
Will deleting cookies log me out of websites?
Yes, deleting all cookies will log you out of most websites because the cookie that keeps you logged in is deleted. You can log back in when ready, and the website will place a new login cookie. If you want to stay logged in, delete only third-party cookies instead of all cookies, though most browsers do not offer this option directly.
Can I delete cookies from just one website instead of all of them?
Yes. In Chrome, Firefox, Safari, and Edge, you can click the lock icon or site information icon next to the website address in the address bar, then find the option to clear cookies for that site only. This is useful if you want to remove tracking from one company without logging out of everywhere else.
Do private or incognito browsing modes prevent tracking cookies?
Private browsing modes delete all cookies when you close the window, but they do not prevent cookies from being created while you browse. Advertisers still track you during your session. Blocking third-party cookies in your regular browser settings is more effective because it stops tracking from happening at all.
If I delete cookies, will advertisers stop showing me targeted ads?
Deleting cookies removes one source of data about you, but advertisers use many other methods to target ads — your login data, your IP address, your email address if you have signed up for their service, and fingerprinting. Blocking cookies helps, but targeted ads will not stop completely unless you also log out of social media and use other privacy tools.