What Websites Know About You & How You Can Limit It

When you visit a website, whether you’re using your phone or computer, it’s not just a one-way interaction. Your experience may seem one-sided, but while you open a website, read what you need to read, and eventually close the tab, other parties are collecting information the entire time. 

Some of that information is minor and disappears quickly. But some data gets stored and matched to other data about you, then used to build a profile that follows you across the internet. 

Understanding what websites know about visitors, and how that information is gathered, is the first step toward controlling your online data profile. Let’s make sure you know your options. 

What Data Does a Website Collect? 

One of the first things that a site receives when you vist is is your IP address. This can be used to estimate your geolocation, down to your city or region. Often, your ISP is visible, too, as it is tied to your IP address. 

Beyond that network layer, sites also collect information about the specific device you’re using. They can determine what kind of device it is, what browser you’re using, what operating system you’re on, what your screen resolution is, and even what fonts are installed on your computer. 

Your behavior also plays a part. There is value for businesses in knowing which pages you visit, how long you stay, what you click, and even where you came from before you arrived. You don’t have to type anything in for this data to be collected. 

Lastly, you may provide data to a website directly by entering information into various fields. How many times have you input a name, email address, search term, or any other info into a form? 

People often don’t think about this kind of data collection when they’re browsing the internet, and it’s understandable why not. Because this information doesn’t feel valuable to the average person, it’s easy to assume that no one else would find it valuable, either. But companies want this information for all kinds of reasons, and your activities online are a lot more valuable than you may realize. 

What Websites Can See About You (And What They Can’t)

There is a persistent myth that a website can see your exact physical address by looking at your IP. Importantly, it can’t.

An IP address typically reveals your approximate geolocation, but it’s usually accurate to a city or metro area, not a specific street or building. However, without any effort on your part, websites can see your:

• IP address
• Browser
• Device type
• Behavior on the page

And of course, if you input information into a website, like your name, birthdate, or payment details, then you are granting permission to the site to view that information.

Worth remembering is this: Passive data arrives automatically, the moment your device connects. Volunteered data only shows up because you typed it in or clicked “allow” on a prompt, but a site doesn’t need your permission to log your IP address or note that you’re using Chrome on a Windows laptop. It does need your permission to know your birthday.

Websites also can’t see what happens outside their own pages. A site you’re visiting has no direct window into your email inbox, your other open tabs, or your search history on a different service. What it can do is combine what it collects with data from ad networks, analytics providers, or other partners it works with, which is how a fairly limited snapshot from one visit can turn into a more detailed profile over time.

Why This Data Matters

The data collected during a single site visit might seem small or inconsequential on its own, but it rarely stays isolated. Most of it gets used, combined, or sold in ways that affect you. 

Ad targeting is the most visible example. The pages you visit and the products you look at get fed into advertising networks, which is why an item you searched for once seems to follow you across unrelated sites for weeks afterward. It may seem harmless, but there are some serious concerns about privacy violations and predatory marketing. 

The same strategy, when applied to ideas instead of products, can create a dangerous echo chamber, where people encounter harmful ideas that go unchallenged. 

Price discrimination is a less visible but real possibility. Some retailers and travel sites adjust pricing based on signals like your location, device type, or browsing history, meaning two people searching for the same flight or hotel room can see different prices. Pretty frustrating if you’re the one getting charged more than someone else! 

Data brokers add another layer. These companies collect browsing behavior, purchase history, and other details from many sources, then package and resell that information to advertisers, insurers, or other businesses. Most people never interact with a data broker directly, yet their information still ends up in these databases.

Finally, there’s also a security dimension. Any data a website stores, whether it’s your email address or your browsing habits, becomes a liability if that site experiences a breach. The more places your information sits, the more chances it has of being exposed somewhere you never agreed to.

Wondering if your data has been exposed in a data breach? Use our free data breach check tool.

None of this means every website is working against you, but it means the data trail left behind by ordinary browsing has real consequences. That’s exactly why limiting it is worth the effort.

How You Can Limit Companies’ Use of Your Data 

You can’t make yourself invisible to every website, but you can significantly reduce what gets collected and how easily it’s tied back to you.

Adjust Your Browser Settings

To take control of your data, start at the browser level. 

Using private or incognito windows prevents some tracking from persisting between sessions, though they don’t hide your IP address or stop the site itself from logging your visit. (That’s a misconception about incognito browsers.) 

Clearing cookies regularly, and blocking third-party cookies specifically, cuts down on cross-site tracking, since third-party cookies are what let advertisers follow you from one site to another.

Many modern browsers also let you limit fingerprinting, meaning they reduce how many distinguishing details, like screen resolution, installed fonts, or time zone, a site can use to identify your device without cookies. 

The options vary by browser:

• Firefox includes a stricter setting that standardizes some of this information so your browser looks more generic. 
• Safari limits fingerprinting by default as part of its built-in tracking prevention. 
• Brave includes fingerprinting protection in its standard shields. 
• Chrome doesn’t offer a dedicated setting for this, which is part of why privacy-focused advice often points people toward one of the other three.

Use Dedicated Privacy Tools

Beyond browser settings, dedicated tools add another line of defense. A VPN masks your IP Address, making your geolocation far less precise to any site you visit. A proxy server, on the other hand, can serve a similar function depending on how it’s configured, routing your traffic through a different server before it reaches its destination.

Ad and tracker blockers stop a large share of behavioral tracking before it starts. They intercept the scripts that would otherwise log your clicks and page views. Some browsers now include basic tracker blocking by default, but a dedicated extension typically catches more than the built-in option.

Review What You’ve Already Shared

One of the things that people tend to forget is checking what permissions they have already granted. It can take a little bit of time and digging, but you should go back through the permissions that you’ve given to apps and websites over time. If you no longer use or trust the site, revoke those privileges. 

This includes location access, camera and microphone permissions, and any third-party logins you’ve used to sign into other services.

Adjust Your Account and Privacy Settings

Many sites you use regularly, especially social media and shopping platforms, have privacy dashboards that let you limit how your data is used for ad personalization. These settings rarely turn off data collection entirely, but they can restrict how that data gets shared with outside advertisers or used to build a profile of your interests. Checking these settings every few months is a reasonable habit, since platforms tend to update their defaults over time.