A Practical Guide to Zero-Party Data

Zero-party data is the information customers intentionally and proactively choose to share with you — their preferences, intentions, interests, and how they want to be treated. Coined by Forrester, the term draws a line between data you observe (behavior, purchases) and data people tell you directly. In a world where tracking is disappearing and inferred data is increasingly unreliable, zero-party data is quietly becoming the most valuable data a business can hold: accurate, consensual, and given freely.

This guide covers what zero-party data is, how it differs from first-party data, and how to collect and use it well.

Zero-party vs. first-party data

The two are related and often confused, but the distinction matters:

First-party data is information you collect about customers through their interactions — what they browsed, bought, clicked, or opened. It’s observed and inferred. See first-party data.
Zero-party data is information customers deliberately give you — their stated preferences, goals, and intentions. It’s declared, not inferred.

The difference is who does the telling. First-party data infers that someone might like something from their behavior; zero-party data has them tell you directly. That makes zero-party data uniquely valuable:

It’s accurate. No guessing or inference error — it’s straight from the source’s own words.
It’s about intent, not just past behavior. People can tell you what they want next, not just what they did.
It’s inherently consensual and privacy-safe — they chose to share it, sidestepping the biggest privacy and trust problems.
It’s yours alone — a genuine competitive edge no one else has.

Why zero-party data matters now

Its rise is driven by the same forces reshaping all of marketing:

The cookieless future removed much of the tracking behavioral targeting relied on, so asking beats inferring.
Inferred data is unreliable and sometimes creepy — guessing wrong frustrates customers, and guessing right about sensitive things unsettles them. Asking avoids both.
Privacy-first marketing is the norm — zero-party data is privacy-first by definition, built entirely on willing disclosure.
Personalization needs it — the most relevant personalization comes from what people tell you they want, not what an algorithm guesses.

Zero-party data only exists if customers choose to give it, which means you must offer something worth it. People share when they get value in return:

Better, more relevant experiences — “tell us your preferences so we can show you what’s relevant.” The most natural exchange.
Personalization and recommendations — quizzes and product finders that give tailored results in exchange for preferences.
Access, perks, or content — exclusive access, discounts, or useful content in exchange for information.
Convenience — saving preferences to make future interactions easier.

The clearer and more immediate the value, the more people share. A preference request with no obvious benefit gets ignored; one that visibly improves their experience gets answered.

How to collect zero-party data

Practical mechanisms, from light to rich:

Preference centers — letting people tell you what topics, frequency, and products they care about (great for email and communications).
Quizzes and product finders — interactive tools that help customers and capture their stated needs (“find your perfect…”).
Onboarding and profile questions — asking new customers about their goals and interests up front.
Surveys and polls — direct questions about preferences, intentions, and satisfaction.
Interactive content — configurators, calculators, and assessments that gather declared inputs.

The key across all of these: make sharing easy, valuable, and clearly beneficial to the customer.

Using it (and honoring it)

Collecting zero-party data creates an obligation: if people tell you what they want and you ignore it, you’ve spent trust for nothing. Use it visibly:

Personalize based on what they told you — the whole point. Reflect their stated preferences in content, recommendations, and communication.
Respect stated boundaries — if they said “email me monthly about X,” honor exactly that. Overstepping declared preferences is a fast way to lose trust.
Close the loop — show customers their input mattered, which encourages more sharing (a virtuous cycle).
Keep it current — preferences change; make it easy to update, and refresh periodically.

What to measure

Zero-party data coverage — what share of customers have shared preferences/intentions.
Collection rates — how well your preference centers, quizzes, and prompts perform.
Personalization lift — the improvement from acting on declared preferences vs. not (against a holdout).
Trust and engagement — whether honoring stated preferences improves retention and satisfaction.
Data freshness — how current your zero-party data stays.

A practical starting plan

Identify what declared data would most improve your marketing — preferences, goals, interests that would sharpen relevance.
Build a clear value exchange — a preference center, quiz, or onboarding flow that visibly benefits the customer.
Make sharing easy and beneficial, and be transparent about how you’ll use it.
Act on it visibly — personalize based on what people told you, and honor stated boundaries exactly.
Measure personalization lift and coverage, close the loop, and keep preferences current.

Frequently asked questions

What is zero-party data?

Zero-party data is information customers intentionally and proactively choose to share with you — their preferences, intentions, interests, and how they want to be treated. Coined by Forrester, it’s data people tell you directly rather than data you observe or infer from their behavior, making it the most accurate and privacy-safe data you can hold, since it comes straight from the source with consent.

What’s the difference between zero-party and first-party data?

First-party data is information you collect by observing customer interactions — what they browsed, bought, or clicked — so it’s inferred. Zero-party data is information customers deliberately give you, like stated preferences and intentions, so it’s declared. The difference is who does the telling: first-party infers what someone might want from behavior; zero-party has them tell you directly, making it more accurate and about intent, not just past behavior.

Why is zero-party data valuable?

Because it’s accurate (straight from the customer’s own words, with no inference error), it reveals intent rather than just past behavior, it’s inherently consensual and privacy-safe since people chose to share it, and it’s uniquely yours. As tracking disappears and inferred data becomes unreliable and sometimes creepy, asking customers directly beats guessing — making zero-party data increasingly the most valuable data a business can hold.

How do I collect zero-party data?

Through a clear value exchange, since customers only share when they get something worth it. Use preference centers (what topics and frequency they want), quizzes and product finders that give tailored results for their inputs, onboarding and profile questions, surveys and polls, and interactive content like configurators. Make sharing easy, valuable, and clearly beneficial to the customer, then act on it visibly and honor stated preferences.

The bottom line

Zero-party data — what customers willingly and directly tell you — is quietly becoming the most valuable data a business can have: accurate because it’s declared, privacy-safe because it’s consensual, and uniquely yours. As tracking fades and inferred data grows unreliable, asking customers what they want beats guessing on every dimension that matters.

But it only exists through a genuine value exchange, and collecting it creates an obligation to honor it. Offer clear benefit in return, make sharing easy, and act visibly on what people tell you — and zero-party data becomes the foundation of relevant, trusted, privacy-first marketing that customers actually welcome.

Keep exploring: see first-party data, personalization, and privacy-first marketing, or browse the Digital Business Marketing Awards.