Zero-Party Data

What Is Zero-Party Data?

In an era where third-party cookies are disappearing and tracking blockers are increasing, zero-party data is becoming the most valuable data type for marketers. Quizzes, preference centers, and surveys collect valuable customer insights with active consent — fully GDPR-compliant and without consent banner issues. The data gathered enables better personalization and higher conversions than any cookie-based tracking.

Zero-party data is information that users voluntarily and explicitly share with a company — such as through surveys, preference centers, quizzes, or conscious inputs on a website. Unlike First-Party Data (which you collect through tracking), zero-party data is provided directly by the user and is therefore considered especially valuable and trustworthy. In the post-cookie era, zero-party data is becoming increasingly important for marketing and personalization, because the data doesn’t depend on browser tracking.

Technically, zero-party data works through explicit user inputs: a quiz “What’s your skin type?” collects zero-party data, as does a form “What interests you?” or a satisfaction survey. This data goes directly into your CRM or data warehouse — not into cookies, not into tracking pixels. Since the user consciously shares it, it’s GDPR-compliant and doesn’t require large consent banners. Google and Apple even favor zero-party data because it is more privacy-friendly than tracking.

In practice, websites should actively collect zero-party data: place preference centers, offer quizzes (that gamefully collect data), and ask about interests during sign-ups. An e-commerce store could ask “What size do you usually wear?” or “Which brands do you like?” This data enables better personalization and higher conversions without privacy advocates protesting. Especially during newsletter sign-ups, you should think about zero-party data — users get more relevant content, you get better data.