The cookie is crumbling. Stricter privacy legislation and browser restrictions are making traditional tracking less reliable by the day. For Kinepolis, Europe's leading cinema group, this posed a real threat: less accurate data means less effective campaigns, wasted budget, and blind spots in the customer journey. They needed a way to keep collecting meaningful marketing insights without crossing privacy boundaries. Together, we implemented a server-side tracking setup that not only respects GDPR but actually outperforms the old approach, proving that privacy and performance can go hand in hand.
GDPR-compliant marketing data collection via server-side tracking
Unified tagging server consolidating 5 domains into 1
Integrations with Google Analytics 4, Meta, Google Ads and Snapchat
+52% additional conversions captured via conversions API
+58% ROAS increase year-over-year
The challenge
How do you maintain accurate marketing measurement when cookies are disappearing and privacy rules are tightening? Kinepolis risked losing visibility into campaign performance, making it harder to justify ad spend and optimise the customer journey.
The solution
A server-side tracking architecture built on Google Tag Manager, feeding data to Google Analytics 4 and advertising platforms via conversions APIs. One tagging server now handles all five Kinepolis domains, delivering richer, more reliable data while staying fully GDPR-compliant.
Data expertise for a data-driven entertainer
Kinepolis welcomes over 35 million visitors annually across Europe, Canada and the US. As a publicly listed company, they combine entrepreneurial ambition with a sharp focus on measurable results.
We partner with Kinepolis as their trusted advisor for data, analytics and performance marketing. Our collaboration spans strategy, implementation and ongoing optimisation, helping Kinepolis stay ahead in a rapidly shifting data landscape. This case is one example of how we help them turn regulatory challenges into competitive advantages.
Why the old tracking model was failing Kinepolis
For years, client-side cookies were the backbone of digital marketing measurement. But that foundation is cracking. Privacy regulations like GDPR demand explicit consent. Browsers block third-party cookies by default. Ad blockers strip out tracking scripts. For Kinepolis, the impact was tangible: conversion data became patchy, audience insights grew unreliable, and campaign optimisation turned into guesswork. The question wasn't whether to change, but how fast.
The privacy paradox: more restrictions, better data?
Here's the counterintuitive truth: moving to a privacy-compliant setup can actually improve your data quality. Server-side tracking bypasses many of the limitations that plague client-side methods. By processing data on a secure server before sending it to platforms, you capture conversions that would otherwise be lost to browser restrictions or consent gaps. For Kinepolis, this meant seeing more of the customer journey, not less.
How server-side tracking works for Kinepolis
The technical setup centres on Google Tag Manager server-side, hosted on a dedicated tagging server. This server receives data from all five Kinepolis domains, processes it according to consent settings, and forwards it to Google Analytics 4, Meta, Google Ads and Snapchat via their respective conversions APIs. The result: a single source of truth, consistent measurement across markets, and full control over what data goes where.
From compliance cost to competitive edge
The numbers speak clearly. Since implementing server-side tracking, Kinepolis has captured 52% more conversions through the conversions API compared to the previous setup. Return on ad spend increased by 58% year-over-year. These aren't just technical improvements; they translate directly into smarter budget allocation and more effective campaigns. What started as a compliance necessity became a genuine performance advantage.
The numbers
+1%
Additional conversions captured via conversions API
+1%
ROAS increase (October 2024 vs October 2023)
1->1
Domains consolidated into one tagging server
1months
From kick-off to best-in-class server-side setup
Privacy compliance that pays for itself
Kinepolis now operates with a measurement infrastructure built for the privacy-first era. The server-side setup delivers more accurate conversion data, enabling sharper optimisation and better budget decisions. By consolidating five domains onto one tagging server, the team reduced complexity and gained a unified view of performance across markets. Most importantly, Kinepolis can confidently invest in digital campaigns knowing their data foundation is both GDPR-compliant and genuinely effective. The partnership continues, with iO supporting Kinepolis as privacy regulations and platform requirements evolve.
In just 9 months, iO has helped us shift from struggling with data limitations to having a best-in-class, server-side setup across five markets. We're now capturing significantly more data and seeing real improvements in our campaigns' performance.
