Cookies are small files that websites store in your browser to remember information about you. Some cookies are essential for websites to work properly, while others are used to track your activity for analytics, advertising, and profiling. If you’re wondering whether cookies pose a privacy risk, the short answer is: some do, some don’t.
This guide explains how cookies work, the difference between first-party and third-party cookies, what recent browser changes mean for your privacy, and the practical steps you can take to reduce online tracking.
Most websites use cookies for legitimate purposes, such as keeping you signed in and storing shopping cart contents.
However, some cookies are also used to monitor your browsing habits and build advertising profiles. If you want to reduce your exposure to these tracking cookies:
- Use Firefox or Safari, which block third-party cookies by default.
- Enable tracking protection in your browser.
- Install a reputable content blocker such as uBlock Origin.
- Review and limit cookie permissions where practical.
A cookie is a small text file that a website stores in your browser. When you return to that website, the cookie allows the site to recognize your browser and remember information from previous visits. For example, cookies can remember:
- Your login session
- Language preferences
- Website settings
- Items in a shopping cart
Without cookies, many websites would require you to log in repeatedly or reconfigure settings every time you visit.
A simple example
Imagine checking into a hotel and receiving a room key card. The card itself contains very little information that is meaningful to you. However, when you present it later, the hotel’s systems recognize it and know which room you can access.
Cookies work similarly. The information stored in the cookie may be meaningless to you, but it allows the website to recognize your browser and retrieve relevant information.
Here’s an overview of the different types of cookies:
Session cookies
Session cookies exist only while your browser session remains active. They are typically used for:
- Keeping you logged in
- Maintaining shopping carts
- Managing secure website sessions
Once you close the browser, these cookies are usually deleted. Because they are temporary, session cookies generally pose fewer privacy concerns than long-term tracking cookies.
Persistent cookies
Persistent cookies remain on your device after you close your browser. Websites use them to remember information across visits, such as:
- Login details
- User preferences
- Personalisation settings
The downside is that they can also be used to track behavior over long periods.
Understanding this distinction is key to understanding online tracking.
First-party cookies
First-party cookies are created by the website you are currently visiting. For example, if you visit your bank’s website, any cookies placed directly by the bank are first-party cookies. These are commonly used for:
- Authentication
- Security
- Preferences
- Website functionality
Third-party cookies
Third-party cookies are created by external companies whose code is embedded on a website. Common examples include:
- Advertising networks
- Analytics providers
- Social media widgets
Because the same third-party company may appear across thousands of websites, it can potentially track users as they move from site to site. This cross-site tracking is why third-party cookies became one of the most controversial online privacy issues.
Modern browsers have significantly reduced support for third-party cookies:
- Safari blocks them by default.
- Firefox blocks them by default.
- Brave blocks them by default.
- Google Chrome has repeatedly delayed its plans to remove them, though users can choose to opt out.
This change limits one of the most common forms of cross-site tracking. However, it does not eliminate online tracking entirely.
We’re increasingly seeing advertisers and analytics companies relying on alternative techniques to third-party cookies. These include:
First-party tracking
Many large platforms collect extensive data through their own websites and services. For example, if you use a social media platform while logged in, it can record your activity within its ecosystem.
Browser fingerprinting
Instead of storing a cookie, websites can analyze characteristics such as:
- Browser version
- Device type
- Screen resolution
- Installed fonts
- System configuration
Combined, these details can sometimes create a unique identifier.
Redirect and bounce tracking
Some tracking systems temporarily route users through intermediary domains before sending them to the destination website. This allows trackers to identify users even when traditional third-party cookies are blocked.
CNAME cloaking
Some organizations disguise third-party tracking infrastructure as part of the website’s own domain. This can make tracking requests appear to be first-party traffic.
Privacy-focused browsers have introduced protections against many of these techniques, but the methods continue to evolve.
For most people, the goal shouldn’t be to block every cookie. Doing so can break websites and make browsing frustrating. A more practical approach is to reduce unnecessary tracking while keeping websites functional.
Use a privacy-focused browser
Firefox and Safari provide stronger privacy protections than many mainstream alternatives. They block many tracking technologies by default while maintaining compatibility with most websites.
Block third-party cookies
Most modern browsers include built-in settings that allow you to block third-party cookies. This is one of the simplest and most effective privacy improvements available.
Install a content blocker
Tools such as uBlock Origin can block many tracking scripts before they load. This often reduces tracking more effectively than cookie controls alone.
Regularly clear browsing data
Deleting cookies periodically can reduce the amount of historical tracking data associated with your browser. Keep in mind that this will also sign you out of many websites.
Use privacy-friendly services
Search engines, email providers, and messaging platforms vary significantly in how much data they collect. Choosing services with stronger privacy commitments can reduce tracking beyond what cookie settings alone can achieve.
In most cases, no. Blocking all cookies can:
- Break website logins
- Disable shopping carts
- Prevent sites from remembering preferences
- Reduce functionality on many websites
A better balance is to block third-party cookies and use tracking protection tools while allowing essential first-party cookies.
Summary
Cookies are not inherently harmful. Many are necessary for websites to function properly and provide a convenient browsing experience. The main privacy concern comes from tracking technologies that collect information about your browsing behavior over time.
While the decline of third-party cookies is a positive step for privacy, tracking has not disappeared. Companies increasingly use techniques such as first-party tracking, browser fingerprinting, and redirect-based tracking instead.
For most users, the most effective approach is to use a privacy-focused browser, block third-party cookies, and limit unnecessary data collection where possible. This provides meaningful privacy improvements without breaking the websites you rely on every day.