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What Is an Opt-out Cookie? | All About Cookies

Are you concerned about websites tracking your online activity through cookies? Opt-out cookies allow you to avoid some types of tracking, but they have limitations. In this guide, I‘ll explain exactly what opt-out cookies are, how they work, the pros and cons of using them, and more effective ways to take control of your privacy.

What Are Cookies and How Are They Used for Tracking?

First, let‘s start with a quick overview of what cookies are. Cookies are small text files stored on your computer that remember information about your browsing history and preferences. They are created by websites you visit.

Cookies can be used to personalize your web experience by saving login info, items in your shopping cart, or website settings. However, third-party companies also use cookies to track your activity across multiple sites for advertising and profiling purposes.

According to a 2021 Statista survey, over 25% of internet users worldwide are concerned about the amount of data collected about them online without consent. This is where opt-out cookies come in.

How Do Opt-Out Cookies Prevent Tracking?

Opt-out cookies work by signaling to a website that you don‘t want additional tracking cookies installed by third parties:
diagram showing how opt-out cookies work
When you visit a website, it will usually ask if you consent to opt-out cookies. If you agree, the website places a small opt-out cookie in your browser settings. This cookie tells the website not to allow third-party advertisers and data brokers to place their own tracking cookies or use other methods like browser fingerprinting to monitor your activity.

So in summary, opt-out cookies restrict that particular website from sharing data about your browsing habits with outside companies. But there are also downsides.

The Pros of Opt-Out Cookies

There are some advantages to using opt-out cookies on a site-by-site basis:

  • They prevent third-party tracking cookies and similar practices on that specific website.
  • You have more control over data collection by ad networks.
  • Easy to enable for frequently visited sites where you value privacy.
  • Major platforms like Facebook and Google allow opt-out cookies.

The Cons of Opt-Out Cookies

However, opt-out cookies also come with significant limitations:

  • They are site-specific – opting out on one site does nothing for other sites you visit.
  • You have to repeatedly enable opt-out cookies across each individual website.
  • Over time, opt-out cookies expire and need to be renewed.
  • Opt-out cookies don‘t block more advanced tracking methods like fingerprinting.

For comprehensive protection, opt-out cookies are inefficient compared to other options.

How to Completely Block Cookies

To stop tracking across all websites rather than just individual ones, you have two main options:

1. Use an Ad Blocker

Ad blocker extensions like uBlock Origin prevent all third-party advertising and tracking cookies from loading in your browser. This gives you blanket protection without having to manually opt out over and over.

Some top ad blockers include:

  • uBlock Origin – Open source, blocks trackers and ads with little resource usage
  • AdGuard – Blocks ads plus provides anti-phishing and anti-malware security
  • Ghostery – Shows all trackers on a site and lets you block individually or all

2. Use a VPN with Ad and Tracker Blocking

A virtual private network (VPN) encrypts all of your internet traffic for privacy and security. Leading VPNs like NordVPN and Surfshark also offer ad and tracker blocking. This prevents tracking scripts and cookies from loading no matter what network you‘re on.

So while opt-out cookies have a narrow benefit, ad blockers and VPNs are vastly more effective at protecting your online privacy across the web.

Should You Use Opt-Out Cookies?

Opt-out cookies give you limited control over tracking by third-party advertisers on individual websites. However, constantly managing opt-out settings on every site is extremely time consuming compared to comprehensive solutions like ad blockers and VPNs.

Here are some best practices based on your priorities:

  • If you value privacy above all, use a VPN along with an ad blocker for full protection.
  • If you visit a few specific sites often, take 2 minutes to enable opt-out cookies there as an extra layer of protection.
  • Don‘t rely solely on opt-out cookies to protect your privacy across the web – the limitations are too great.
  • Research sites and browser extensions that offer a simple one-stop opt-out for multiple ad networks.

Taking control of your online privacy doesn‘t have to be difficult. With the right approach, you can browse the modern web freely without being tracked every step of the way.


Streamr Go

StreamrGo is always about privacy, specifically protecting your privacy online by increasing security and better standard privacy practices.