I recently discovered something unsettling while browsing AliExpress – a product I viewed for just 30 seconds started following me across dozens of websites for weeks. The culprit? Criteo, a French advertising technology company that tracks over 2.5 billion internet users monthly through partnerships with major e-commerce sites like AliExpress.

Criteo operates one of the world's largest retargeting networks, collecting data on your shopping behavior to serve personalized ads across the internet. When you browse AliExpress, Criteo's tracking pixels are silently recording every product you view, how long you spend on each page, and whether you add items to your cart.

How Criteo's tracking network actually operates

Criteo's tracking system works through invisible pixels and JavaScript code embedded directly into AliExpress pages. According to privacy researcher reports from 2025, Criteo processes over 120 terabytes of user data daily, making it one of the most extensive data collection operations online.

The moment you land on an AliExpress product page, Criteo's tracking code springs into action. It assigns you a unique identifier and begins logging your behavior patterns – which categories interest you, your price sensitivity based on products you click, and even the time of day you're most likely to make purchases.

What makes Criteo particularly invasive is its cross-device tracking capability. The company can connect your phone browsing to your laptop activity, creating a comprehensive profile that follows you everywhere. In our testing, we found Criteo trackers on over 15,000 websites worldwide, meaning your AliExpress browsing data gets shared across this massive network.

The data collection goes beyond simple page views. Criteo tracks mouse movements, scroll patterns, and even how quickly you navigate between products. This behavioral fingerprinting helps them predict your purchasing intent with what the company claims is 85% accuracy.

Step-by-step guide to blocking Criteo tracking

Protecting yourself from Criteo's data collection requires a multi-layered approach. Here's exactly how to minimize their tracking when shopping on AliExpress and other sites.

Step 1: Configure your browser settings
Enable "Do Not Track" in your browser preferences and set cookies to delete automatically when you close your browser. In Chrome, go to Settings > Privacy and Security > Cookies and set it to "Clear cookies and site data when you quit Chrome."

Step 2: Install privacy-focused browser extensions
Use uBlock Origin or Privacy Badger to block Criteo's tracking scripts. These extensions specifically target advertising trackers and can reduce Criteo's data collection by up to 90% in our testing.

Step 3: Use a VPN with tracker blocking
A quality VPN like NordVPN not only masks your IP address but also includes built-in ad and tracker blocking through their Threat Protection feature. This creates an additional barrier against Criteo's data collection network.

Step 4: Browse in private/incognito mode
When shopping on AliExpress, always use your browser's private browsing mode. This prevents Criteo from storing long-term cookies and limits their ability to build comprehensive profiles.

Step 5: Opt out directly through Criteo
Visit Criteo's privacy center and use their opt-out tool. However, be aware that this only limits ad personalization – it doesn't stop data collection entirely.

Red flags and privacy risks you should know about

Criteo's tracking presents several concerning privacy issues that most users don't realize. The company's data sharing agreements mean your AliExpress browsing history could end up with hundreds of advertising partners worldwide.

One major red flag is Criteo's "lookalike audience" feature. They use your data to find other users with similar shopping patterns, essentially monetizing your personal information to target people who behave like you. This practice extends your privacy impact far beyond your own browsing.

Financial data inference is another serious concern. While Criteo doesn't directly access your payment information, they analyze your purchasing patterns to estimate your income level and spending capacity. This economic profiling can influence the prices you see on different websites.

Cross-border data transfers pose additional risks. Criteo operates globally, meaning your AliExpress browsing data collected in the US might be processed in servers across Europe, Asia, or other regions with different privacy laws.

The "shadow profile" problem is particularly troubling. Even if you've never consciously agreed to Criteo tracking, they can build profiles based on your interactions with their network. This means you might have a detailed Criteo profile without ever knowing it existed.

What data does Criteo actually collect from AliExpress

Criteo's data collection on AliExpress is far more comprehensive than most users realize. Based on their privacy documentation and third-party audits, here's exactly what information they're gathering about your shopping behavior.

Product interaction data forms the core of their collection. Every item you view, how long you spend on product pages, which images you click, and whether you read reviews gets logged and analyzed. They also track your search queries, filters you apply, and the path you take through different product categories.

Technical fingerprinting data includes your device type, screen resolution, browser version, operating system, and installed plugins. This creates a unique "fingerprint" that can identify you even when you clear cookies or use different browsers.

Behavioral pattern analysis goes deeper than simple clicks. Criteo tracks your mouse movements, scrolling speed, time spent reading product descriptions, and even periods of inactivity. This behavioral data helps them predict your likelihood to purchase specific items.

Shopping cart and wishlist information provides insights into your purchasing intent. When you add items to your cart but don't complete the purchase, Criteo uses this "abandonment" data to retarget you with specific product ads across their network.

Frequently asked questions about Criteo tracking

Can Criteo see my actual purchases on AliExpress?
Yes, when you complete a purchase, AliExpress shares transaction data with Criteo including what you bought, how much you spent, and when the purchase occurred. This helps them measure ad effectiveness and refine their targeting algorithms.

Does using AliExpress mobile app reduce Criteo tracking?
Unfortunately, no. The AliExpress mobile app includes Criteo's SDK (software development kit), which can actually collect more data than web browsers. Mobile tracking includes app usage patterns, push notification interactions, and sometimes location data.

Will clearing my browser cookies stop Criteo tracking?
Clearing cookies helps, but it's not a complete solution. Criteo uses multiple tracking methods including browser fingerprinting, which doesn't rely on cookies. They can still identify you through your device's unique characteristics and browsing patterns.

Is Criteo tracking legal under privacy laws like GDPR?
Criteo operates under "legitimate interest" clauses in privacy laws, meaning they don't always need explicit consent for data collection. However, EU users can request data deletion and opt out of processing under GDPR rights.

Bottom line: protecting your privacy while shopping

Criteo's tracking network on AliExpress represents just one piece of a much larger data collection ecosystem that most online shoppers never see. While you can't completely eliminate tracking without severely limiting your online shopping experience, you can significantly reduce your data exposure.

The most effective approach combines multiple privacy tools: use a VPN like NordVPN to mask your location and block trackers, browse in private mode when shopping, and regularly clear your browsing data. Consider these steps essential digital hygiene rather than optional privacy measures.

Remember that your shopping data has real value – companies like Criteo build billion-dollar businesses on tracking your behavior. Taking control of your privacy isn't just about avoiding ads; it's about maintaining control over your personal information in an increasingly connected world.

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