Implementing a future-proof tag management system
Why you need to prepare your web tracking setup for the future
- Article
- Technical Web Analytics
- Server-side tracking


Web analytics faces growing challenges from stricter laws, browser updates, cookiebanner updates, and ad blockers. These changes make it harder to track website performance and to get a grasp on metrics like Return On Ad Spend (ROAS). Many businesses look for quick fixes to bypass legal and technical issues. However, these shortcuts often fail and lead to higher costs. A better approach is to prioritise ethics, privacy, and a proper technical setup.
In this article series we dive into tracking prevention measures. Learn how to deal with the developments in web analytics and optimise your TMS for the future.
This article series consists of 4 articles:
- (Current article) Why you need to prepare your web tracking setup for the future
- Tracking conversions in a privacy first browser
- Tracking unique users in a privacy first browser
- (Re)targeting users in a privacy first browser
In this article, we’ll outline the two major developments reshaping web tracking—privacy legislation and tracking prevention and explain how these impact conversion tracking, unique user measurement, and targeting. We’ll also introduce the key areas where you’ll need to upgrade your TMS to stay ahead.
GDPR and browser tracking prevention have changed how companies collect and use data. Strict consent rules and blocked cookies disrupt marketing and analytics. To keep up, businesses need to adapt their TMS—focusing on conversion tracking, unique users, and targeting—tailored to their needs.
The two main developments in web analytics
We can divide the developments in two categories: legislation and tracking prevention measures by browsers, operating system and adblockers.
1. How legislations are transforming web analytics and data privacy
The GDPR requires organisations to obtain explicit consent or establish another lawful basis for processing personal data, clearly linked to its intended purpose. It places strong emphasis on having a clear and accessible privacy notice that informs users how their data is used.
The regulation also mandates that data breaches must be reported without undue delay, and no later than 72 hours after becoming aware of them. It highlights the need for a Data Protection Impact Assessment (DPIA) for high-risk processing activities and, in some cases, the appointment of a Data Protection Officer (DPO) to ensure compliance.
This wide-reaching regulation prioritises the protection of personal data, giving individuals greater control while placing strict responsibilities on organisations.
These rules directly affect how organisations may collect, process, and use data, imposing clear requirements for handling personal information.
2. How tracking prevention impacts digital analytics and marketing
Tracking prevention measures now block third-party cookies entirely and restrict first-party cookies and data transmission to specific endpoints (like Facebook.com). You can find definitions of these terms here. As a result, three key areas in digital analytics and marketing are affected:
- Loss of conversion visibility: Many conversions can no longer be attributed to the campaigns that actually drove them, making performance measurement harder.
- Unreliable user-level metrics: Analysis that depends on identifying unique users has become inaccurate. Metrics such as unique users, cost per acquisition, and average revenue per user are now inflated and no longer reflect reality.
- Targeting limitations: With third-party cookies gone, building marketing audiences for platforms like Meta and Google has become significantly more difficult. Reaching specific users across the web is now a challenge.
Since the GDPR and tracking prevention came into play, websites should already have a cookie banner in place, along with clear information about how and why personal data is processed.
Secondly, users must also be able to easily delete any personal data that has been collected by a company.
Finally, and what will be discussed later on in this article series: If gaining insights at the individual level and running personalised marketing campaigns matter to you, it’s essential to tackle the challenges caused by tracking prevention.
Choosing the right upgrade depends on your needs
The right upgrade depends on your organisation and its specific goals. Some may also need to consider whether the investment is worth it for their situation.
In the past, tracking user behaviour and targeting them across the internet came almost automatically with TMS and analytics tools.
Nowadays, doing this well requires investment in software, employee training, and a clear data strategy. Not every product or organisation will find this investment worthwhile.
What to expect in this series
We will outline a TMS upgrade that responds to every part of tracking prevention. You can assess which elements apply to your organisation and learn how to put them into practice.
As mentioned earlier, there are three main areas of impact: tracking conversions, tracking unique users, and targeting or retargeting users. In the next three articles, we will dive deeper into each of these topics, explain the challenges, and walk through the upgrades that can help solve them.
This is an article from Anne Wind
Anne Wind, Technical Web Analyst, combines his marketing background with expertise in data collection. His critical view of data from a marketing perspective led him to the technical side of data analysis. With a focus on accurate data collection, he helps organisations turn insights into impactful actions.
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