The End of Third-Party Cookies: Marketers Pivot to Zero-Party Data
Digital advertising is undergoing a massive transformation as tech giants restrict how user data is tracked across the internet. With traditional tracking methods losing their power, brands are urgently searching for new ways to understand their audiences. To survive this shift, marketers are moving away from stealthy data collection and pivoting directly to zero-party data.
The State of the Cookie Phase-Out
For over a decade, digital marketers relied heavily on third-party cookies. These small pieces of code allowed advertisers to track your browsing habits across different, unrelated websites. This data built the foundation of targeted advertising on platforms like Facebook and Google.
However, privacy concerns have changed the rules of the internet. Apple Safari and Mozilla Firefox blocked third-party cookies years ago. Apple also dealt a massive blow to third-party tracking with its iOS 14.5 update, introducing App Tracking Transparency (ATT). This forced apps to ask users for permission to track them, resulting in millions of users opting out.
Google Chrome, which holds roughly 65% of the global browser market, is the final piece of the puzzle. While Google initially planned to ban third-party cookies entirely, the company announced a pivot in July 2024. Instead of a forced ban, Google Chrome will introduce a new prompt allowing users to make an informed choice about web tracking. Industry experts predict a massive opt-out rate similar to Apple’s ATT update. For marketers, the result is exactly the same: third-party data is no longer reliable.
Defining Zero-Party Data
The research firm Forrester coined the term “zero-party data” to describe a new, more transparent approach to customer information. Zero-party data is information that a customer intentionally and proactively shares with a brand.
This is fundamentally different from other types of data:
- Third-Party Data: Information bought from data aggregators who track users across multiple external websites.
- First-Party Data: Information a brand observes from a user’s behavior on its own website, such as what products they clicked on or how much time they spent on a page.
- Zero-Party Data: Information the customer explicitly tells the brand, such as their specific preferences, purchase intentions, or personal background.
When a customer tells a clothing brand they are shopping for a winter coat in a size medium, that is zero-party data. There is no guessing or algorithm involved. The customer provided the exact context the brand needs.
Why Brands Are Making the Switch
Relying on voluntary data solves several major problems for modern businesses.
First, it guarantees accuracy. Algorithms often make mistakes when guessing user preferences based on clicking behavior. A user might browse for baby toys to buy a gift for a friend, confusing a third-party tracking algorithm into thinking they are a new parent. When brands ask users directly about their needs, the data is perfectly accurate.
Second, zero-party data builds trust. Consumers are increasingly wary of brands that seem to know too much about them without ever asking. By asking for information upfront, brands create a transparent relationship.
Finally, collecting data directly from the consumer helps companies stay compliant with strict data privacy laws like the General Data Protection Regulation (GDPR) in Europe and the California Consumer Privacy Act (CCPA) in the United States.
How Marketers Are Collecting Voluntary Data
You cannot simply ask customers to hand over their personal preferences without offering something in return. Marketers call this the “value exchange.” Consumers will happily share their data if they get a discount, a personalized experience, or an entertaining interaction in return.
Here are the specific tactics brands are using right now:
Interactive Quizzes
Product recommendation quizzes are currently the most popular way to gather zero-party data. E-commerce brands use software like Octane AI or Jebbit to build these interactive experiences.
For example, the custom haircare brand Prose requires users to take a deeply detailed consultation quiz before buying. Users answer questions about their hair thickness, scalp moisture, diet, and even their local ZIP code (to account for water hardness). In exchange for this wealth of zero-party data, the customer receives a highly personalized product formulation.
Preference Centers
Many brands are revamping the standard account profile. Instead of just holding a shipping address and password, profiles now act as preference centers. Sephora’s Beauty Insider program is a perfect example. Sephora encourages members to fill out their beauty traits, including hair type, eye color, and primary skin concerns. Sephora then uses this data to filter product reviews and send highly targeted email campaigns.
Conversational Pop-Ups
Instead of a generic “Sign up for our newsletter” pop-up, brands are asking interactive questions. A coffee roaster like Trade Coffee might use a pop-up that asks, “How do you brew your coffee at home?” with options for French Press, Espresso, or Drip. Once the user clicks an option, they are prompted to enter their email address to receive a discount on beans matching that exact brew style.
Post-Purchase Surveys
The moment right after a customer buys a product is highly valuable. Brands use tools like Fairing or KnoCommerce to place a quick survey on the checkout confirmation page. They ask simple questions like, “How did you hear about us?” or “Who is this purchase for?” to gather data that tracking pixels can no longer accurately capture.
The Technology Stack Driving the Change
To make zero-party data work, brands need specific software to store the information and trigger marketing campaigns based on the answers.
Customer Data Platforms (CDPs) and advanced email marketing tools are stepping in to fill this need. Klaviyo is heavily favored by Shopify merchants because it allows brands to store custom profile properties. If a customer says their favorite color is blue in a quiz, that data point flows directly into their Klaviyo profile. The brand can then set up an automated email that only sends blue products to that specific customer.
Similarly, SMS marketing platforms like Attentive and Postscript allow brands to collect conversational data via text message. A brand can text a subscriber asking what type of content they want to see, and the subscriber simply replies with a number to set their preferences.
By combining direct questioning with powerful marketing software, brands are proving that they do not need stealthy web trackers to deliver highly relevant advertisements.
Frequently Asked Questions
What is the difference between first-party and zero-party data? First-party data is observed behavior on your own website (like tracking which pages a user visits). Zero-party data is explicitly shared by the customer (like a user filling out a poll telling you exactly what they want to buy).
Is Google still getting rid of third-party cookies? Google abandoned its plan to force a complete ban on third-party cookies in July 2024. Instead, Google Chrome is introducing a user-choice prompt that lets individuals decide if they want to be tracked. Because industry experts expect most users to opt out, advertisers still need to prepare for a world where third-party data is heavily restricted.
How do you encourage customers to share their personal data? You must offer a clear value exchange. Customers are willing to share information if they receive something valuable in return, such as a personalized product recommendation, a discount code, a free sample, or access to an exclusive loyalty tier.