How to target audiences when Google ends support for third-party cookies
June 6, 2021

Next year, Google is removing third-party cookie support from Chrome.


The market-leading web browser’s abandonment of third-party cookies heralds a transformation in targeted advertising and personalised content practices, presenting a major challenge for digital marketers. In the lead-up to the retirement of the third-party cookie, businesses that wish to continue to serve relevant content and facilitate targeted opportunities for product and service discovery must begin to transition to other data-led audience engagement methods.


Here, we outline six technology solutions and change management strategies to ease your audience engagement methods through the closing act of the third-party cookie, as we enter a new age of transparently collected user data and privacy-sandboxed datasets.


First-party cookies will remain in the marketer’s toolbox


Thankfully, Google has signalled that Chrome will continue to allow first-party cookies in their March 2021 blog post.


A first-party cookie is a piece of code that a website drops into a browser when the site is loaded. The cookie acts as a visitor’s record of what they have typed into the site, what they have looked at or clicked on, and what browser and device they are using to navigate the site. These types of cookies allow for website personalisation and permanence. Cookies enable the same settings to remain in place should the visitor leave and later return to the site. Through the use of cookies, a user’s delivery details are remembered, and their previously selected products remain in the site’s online store basket.


From a marketing perspective, data collected by first-party cookies is useful for generating data analytics for a website. A marketing manager can see where users link from and which pages are engaged with the most, as well as collate demographic information, such as where site visitors are geographically located.


What is a third-party cookie and what is it for?


Third-party cookies, or “tracking” cookies, may be dropped by a site the user is visiting, but they are actually generated by a third-party company, such as a marketing business. The cookie tracks the user’s activity on the site and adds that information to a record of activity on other sites that the user has visited. All this information is sent back to the company that generated the cookie to give them a profile of the user’s personal information, web activities and patterns of preferences. A profile of the user is built up in this way, which is useful for targeted marketing purposes.


Third-party cookies allow advertisers to connect with consumers or potential clients who have the most chance of being interested in their products and services, even if those people have not actively sought out and engaged with the offering’s online presence in the past. Users are served content that is relevant to their interests and that they are likely to want to engage with, tailored to their situation and preferences.


Why are third-party cookies being phased out?


Google’s phase-out of third-party cookies is part of a move towards a new Privacy Sandbox solution to serving targeted ad content based on anonymised aggregate user groupings, with individual user-level information held only on the user’s device. This follows the 2019 GDPR (General Data Protection Regulation) ruling by the Court of Justice of the European Union, which found that a consent box for accepting third-party cookies could not be pre-ticked when offered.


Google’s change of approach recognises a general rise in concern about online privacy, reflected in the GDPR case ruling. In particular, it addresses the user-perspective problem of not being privy to the identity of any companies accessing third-party cookie data after the original company issuing the consent request obtains consent and passes the cookie data on. Potentially persistent and hyper-targeted advertising or messaging resulting from third-party cookie tracking can lead to harassment and personal invasion during web browsing, which can generate ill-will and resistance towards Google’s platform.


How to update your digital marketing strategy to abandon third-party cookies


In order to transition from targeted marketing using third-party tracking cookies and individual data profiling, consider these six opportunities for growing customer engagement and ROI from your marketing strategy.


Enhance first-party data quality and utility through better capture

The changing digital landscape for data collection and use demands a new focus on owned, first-party data sets. Building a quality set of privacy-compliant data takes time, so the time to act is now.


Adding surveys, quizzes and chatbots to your online presence can generate a trove of granular customer data. Encouraging user registrations with incentives, or arranging events that involve user registration, can also boost your customer profiles for more tightly or creatively targeted campaigns. Encouraging interaction by offering a clear benefit, whether it be an interactive experience, access to a resource, or other tangible reward is a great way to build your data set.


Foster strong customer relationships with best practice cookie consent systems

Fostering customer trust during first-party data capture and subsequent usage retains the value of the data set by keeping goodwill towards your brand high. Best in class privacy compliance is required at all points of data capture. Always adhere to privacy regulations and remain transparent about what data your business is collecting, what it will be used for and who it will be shared with, to ensure that your first-party data is future-proof as the industry trend towards privacy continues.


Leverage second party data from major platforms

Google Ads, Google Display & Video 360 and Facebook Ads Manager offer aggregated yet granular audience data. Google is implementing “cohort” identities, grouping users by interests and anonymising individuals within their cohort so that they can be marketed to as a group. Facebook already has a similar “Lookalike Audience” system.


Consider second party data from publishers

Buying advertising with a main publisher gives you access to the publisher’s data so that you can better target your ads, whether it’s display, video or native ad content, by comparing the publisher’s data with your CRM.


Investigate non-cookie-based third-party data troves

Non-cookie-based third-party audiences are a privacy-compliant, transparently collected source of engagement-targeting data that’s future-proof and available now. An example is VisualDNA, which is a personality quiz business that creates audience aggregate profiles for target marketing.


Generate engagement through intensified place and time targeted campaigns

Geomarketing and “moment marketing” methods of combining user profiling with geographical and time-sensitive campaigns can leverage quality data into leads and sales when synchronised with event-based moments of heightened attention or intent to buy.


Contact the experts


If your marketing is heavily reliant on soon-to-be-obsolete third-party cookie data, or if you aren’t sure how to navigate the transition to a new data, technology and vendor environment, get in touch with our team today. We’ll help you to future-proof and optimise your digital marketing strategy for 2022 and beyond.

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The Client AGA Air Conditioning is a Canberra-based heating and cooling specialist delivering residential and commercial installation, servicing and maintenance across the ACT. AGA had built a strong reputation through quality workmanship, referrals and customer service. What it needed was a digital and acquisition sy stem that matched the standard of the business and its growth ambitions, one built to support serious, sustained investment rather than one-off campaign spend. PupDigital was engaged in a multi-year partnership to bring the website, conversion tracking and paid media strategy together into a single, connected acquisition system. The Challenge AGA was already a trusted local provider, but its website and advertising weren't working together as one system. The site needed to better communicate the quality of the business and give prospective customers a clearer path to enquire. At the same time, the advertising account needed to become far more commercially disciplined. 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The Results Following the website launch in May 2025, AGA's Google Ads performance improved substantially against the preceding period: Conversions up 14% 18.71% conversion rate, a 77% improvement Impressions up 22% Monthly ad investment scaled 300% across the partnership The standout result was conversion rate, not raw traffic volume. The campaigns didn't need to chase the largest possible audience. They became more focused on reaching people actively searching for AGA's services and directing them into a stronger website experience. The result was a materially higher percentage of visitors taking meaningful action, a more efficient acquisition system, not just a busier one. Broader Business Growth: A Harvey Norman Commercial Contract Throughout the partnership, AGA continued expanding its residential and commercial workload, including securing a significant commercial contract with Harvey Norman Commercial, alongside a growing volume of rough-in and fit-off work. 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Scaling Investment With Confidence As performance and enquiry consistency improved, PupDigital progressively scaled AGA's monthly ad investment, growing it 300% over the course of the partnership. This wasn't a case of increasing spend and hoping volume followed. Every scaling decision was informed by conversion performance, search demand, lead quality feedback, seasonal opportunity, and AGA's real capacity to service new work. Growth in ad spend only compounds when the wider system, website, tracking and campaign structure, can convert that investment efficiently. Building that system first is what allowed AGA to keep increasing investment with confidence, rather than second-guessing where the budget was going. 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Landing a contract like that comes down to the quality of AGA's work and reputation, not an ad campaign in isolation. What it does show is the broader trajectory of the business during our partnership, and the part PupDigital played in making sure AGA's digital presence could keep up with, and represent, that scale of growth. Winning commercial-level work like this means having a website and digital presence that looks and performs the part, and that's what we focused on throughout. The Business Impact The most valuable outcome wasn't any single campaign result or website metric. 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