You finish browsing, close the tab, and five minutes later an ad for that exact product shows up on Instagram. That’s not a coincidence. That’s a tracking cookie doing its job, and the list of who uses cookies to track the websites you visit is longer than most people think.
It’s not just Google and Meta. It’s ad networks, data brokers, e-commerce platforms, mobile apps, and even your internet service provider. They all want a slice of your browsing behavior.
When you land on a page, small text files get dropped on your device. Some come from the site itself (first-party cookies). Others come from third parties embedded in that page — analytics scripts, ad pixels, social buttons. Those are the ones that follow you across the web.
The main players behind tracking cookies are:
- Advertising networks like Google Ads, Meta Audience Network, and programmatic ad exchanges.
- Analytics companies such as Google Analytics, Hotjar, and Mixpanel.
- Data brokers that buy and resell browsing profiles to whoever pays.
- E-commerce platforms tracking cart abandonment and product interest.
- Mobile apps with SDKs that ping back to ad servers even when you’re not using them.
- ISPs in some countries that inject or analyze traffic for ad targeting.
So when someone asks who is watching your browsing, the honest answer is: a whole industry. Not just the site you’re on.
A first-party cookie is set by the domain you’re actually visiting. It remembers your language, your login, your cart. That’s mostly fine — it’s what makes a site usable.
A third-party cookie is set by a different domain loaded on the page. That’s the one that lets an ad network recognize you on a news site, then again on a shopping site, then again on a forum. That cross-site recognition is the whole point.
Google started phasing out third-party cookies in Chrome back in 2024, then reversed course. As of 2026, Chrome still supports them, but with more user controls. Safari and Firefox already block them by default.
That inconsistency is why tracking is so messy right now. There’s no single rule across browsers.
How tracking actually works in 2026
Cookies are just one tool. The bigger picture includes browser fingerprinting, where your device’s characteristics (screen size, fonts, timezone, GPU) create a unique ID that survives cookie deletion. There are also pixel tags, local storage, and CNAME cloaking, where a tracker disguises itself as a first-party subdomain to bypass blockers.
In practical terms, who uses cookies to track the websites you visit? Everyone who has a financial incentive to know what you click, buy, or hesitate over. That includes companies you’d never suspect, like retailers, travel sites, and even some news outlets.
You can reduce it, but not eliminate it. Here’s what actually works:
- Use a browser that blocks third-party cookies by default — Firefox, Safari, or Brave.
- Install a tracker blocker like uBlock Origin or Privacy Badger.
- Enable Global Privacy Control (GPC) in your browser settings — it sends a legal opt-out signal under laws like CCPA.
- Clear cookies regularly, but know that fingerprinting survives this.
- Avoid logging into every site with the same Google or Facebook account — that ties your identity across services.
What doesn’t work: relying on cookie banners alone. Most are designed to nudge you into clicking «Accept all.» Dark patterns are still legal in many regions.
The uncomfortable truth about data collection
Most tracking isn’t about showing you better ads. It’s about building a behavioral profile that gets sold, resold, and used to predict what you’ll do next. Your browsing history is a product.
And here’s the part nobody likes to admit: even privacy-focused tools leak data. Your ISP sees your DNS requests unless you use encrypted DNS. Your mobile carrier sees which apps you open. Your smart TV reports what you watch.
So when you ask who uses cookies to track the websites you visit, the real answer is: anyone who can, and a few who shouldn’t. The only defense is knowing the game and playing it deliberately.
