GDPR strictly governs audience measurement, and Google Analytics 4 concentrates a large share of site owners’ questions since Universal Analytics was discontinued. The question always comes back to the same point: can a tool that transfers data to the United States and drops identifiers be used in Europe without exposing the site to legal risk. This article details what compliance actually involves, point by point, without replacing legal advice specific to each organization.

Is Google Analytics 4 compliant with GDPR

Google Analytics 4 must be configured to comply with GDPR once installed. The tool collects browsing data, assigns an identifier to the visitor, and transfers part of this information to Google’s servers, some of which are located in the United States. These three elements, combined, place the tool under GDPR as soon as it measures visitors located in the European Union.

Compliance is achievable, but it requires active configuration rather than a simple installation of the tracking code. Consent must be collected before measurement fires, the data retention period must be reduced, and transfers to the United States must rely on a legal framework recognized by European authorities. The configuration options of Google Analytics 4 allow a site to operate within this framework.

Why Google Analytics 4 raises questions under GDPR

GDPR requires that any processing of personal data rest on a legal basis, that data be kept only as long as necessary, and that transfers outside the European Union offer an equivalent level of protection. Google Analytics 4 touches all three points at once: it processes an IP address and a visitor identifier considered personal data, it transfers part of the data to American servers, and it offers a retention setting that can be adapted to the needs of each site.

The CNIL’s position on Google Analytics

The CNIL has investigated several cases involving the use of Google Analytics by French site owners, following decisions made by other European data protection authorities. These cases mainly concerned data transfers to the United States, judged insufficiently framed under GDPR before new certification mechanisms between the European Union and the United States came into force. In some cases, the CNIL asked the sites concerned to come into compliance or to abandon the tool in favor of an alternative.

Data transfers to the United States

Transfers to the United States remain the most closely watched point by European authorities, since part of Google Analytics 4’s infrastructure is hosted there. The Data Privacy Framework, an agreement between the European Union and the United States that came into force after the previous frameworks were invalidated, now provides a recognized legal basis for these transfers when the receiving company adheres to it. Its existence reduces legal risk without eliminating it entirely, since its stability over time depends on political and judicial decisions that may still evolve.

Google Analytics 4 drops cookies and identifiers that do not fall under the consent exemption reserved for strictly anonymous, limited use audience measurement tools. In practice, this means a consent banner must display before the measurement tag fires, with a genuine choice between accepting and refusing, presented symmetrically, with no pre-checked box or refusal button hidden in a submenu.

Collecting consent must also translate technically into the measurement tool itself: a visitor who refuses must trigger no collection at all, not even partial. A banner that asks for consent without actually blocking tags from loading until an answer is given creates a gap between what is displayed and what happens technically, which is in itself a compliance defect frequently flagged during audits.

Consent Mode v2 is a mechanism provided by Google that automatically adjusts the behavior of Google Analytics 4 and Google Ads tags according to the choice expressed by the visitor in the consent banner. In the absence of consent, the tool can rely on modeled measurement, which statistically estimates certain behaviors without collecting individually identifiable data. This mechanism helps respect the user’s choice, but it does not remove the need for a compliant banner, documentation of the processing, or vigilance over the other retention and transfer settings.

Steps to bring Google Analytics 4 into compliance

Bringing the tool into compliance combines several independent settings, which should be handled one by one rather than hoping a single one will suffice. The first is collecting consent itself, through a consent management platform that genuinely blocks tags from firing until a choice has been made. The second is enabling Consent Mode, which links that choice to the actual behavior of Google Analytics 4. The third is limiting the signals sent to Google’s advertising products, by disabling the data association features that are not necessary for audience measurement itself.

Anonymizing and minimizing collected data

Google Analytics 4 anonymizes part of the information linked to the IP address by default, a different behavior from Universal Analytics, which required a manual setting to do so. Minimization nonetheless remains an active effort: it involves disabling the collection of parameters that are not essential to running the site, and avoiding passing identifying information such as a name or an email address into measurement events, a configuration mistake regularly flagged on sites that pass form data into their measurement events.

Reducing the data retention period

GDPR requires that data be kept only as long as necessary for the purpose of the processing. Google Analytics 4 offers a user and event data retention setting, configurable in the tool’s properties, which determines the period before automatic deletion. A retention period aligned with the actual analytical need, rather than the default maximum, reduces both the legal risk and the volume of personal data exposed in the event of a security incident.

Google Analytics 4 versus Universal Analytics on GDPR

Universal Analytics, whose data processing Google has discontinued, relied on a session based collection model that had prompted some of the first alerts from European authorities on data retention and transfers. Google Analytics 4 brought several improvements: shorter default retention periods, native consent handling through Consent Mode, and partial IP address anonymization without any additional setting. The shift in architecture, oriented around events rather than sessions, does not however change the nature of the GDPR issues themselves: consent, retention, and transfers remain the three points of vigilance, whichever version of the tool is installed.

GDPR compliant alternatives to Google Analytics

Some site owners choose to replace Google Analytics 4 rather than manage its compliance, particularly when the traffic volumes processed make the question of international transfers sensitive. Several solutions hosted in Europe, such as Matomo in its self hosted version, meet this demand by keeping data on servers located in the European Union, which simplifies the compliance analysis linked to transfers. A detailed comparison of alternatives to Google Analytics details the functional differences and use cases of these tools.

Choosing an alternative does not, however, remove the other GDPR obligations: consent, informing users, and the retention period still need to be addressed, whichever tool is chosen. The question also arises in parallel with server side tracking, an architecture that changes how data travels to the measurement tool without removing the requirement to collect prior consent.

Beyond the choice of measurement tool itself, compliance is also managed through the tools that trigger it. The guide to Google Tag Manager details how a tag management platform centralizes the conditional firing of Google Analytics 4 tags based on the consent collected, rather than handling it tag by tag in the site’s code. For teams who want to compare measurement indicators more broadly, the web analytics feature places Google Analytics 4 within the wider set of measurement tools available on the market.

The choice between keeping Google Analytics 4 and migrating to a European solution mostly depends on the site’s profile. An institutional or nonprofit site, with limited traffic and few advertising stakes, often benefits from migrating to a solution hosted in Europe, which simplifies compliance documentation and reduces dependency on regulatory changes affecting international transfers. An e-commerce site that otherwise relies on Google’s advertising products may find more value in keeping a properly configured Google Analytics 4, since integration with these products remains more direct than with a third party tool. In both cases, the decision deserves to be documented in the processing records, along with the reasons behind it and the settings chosen.

Frequently asked questions

What is Google Analytics 4?

Google Analytics 4 is the current version of Google’s audience measurement tool, which replaced Universal Analytics. It relies on event based collection rather than sessions and pageviews, and it centralizes web and app data in a single property. It is widely used by sites to track their traffic and conversions.

Is Google Analytics 4 compliant with GDPR?

Google Analytics 4 can be used in line with GDPR provided it is configured accordingly. Compliance depends on the configuration chosen, notably collecting consent before any measurement cookie is dropped, the data retention period, and how transfers to the United States are set up. Like any audience measurement tool, Google Analytics 4 must be configured to meet GDPR requirements, which its options allow.

Have sanctions already targeted the use of Google Analytics under GDPR?

Several data protection authorities in Europe, including the French CNIL, have examined complaints about the data transfers generated by Google Analytics toward the United States and have asked the sites concerned to come into compliance. Outcomes vary from case to case and from authority to authority, which makes any generalization risky: each site owner remains responsible for assessing its own use of the tool.

Is a consent banner mandatory with Google Analytics 4?

Yes, in the vast majority of cases, because Google Analytics 4 drops cookies and identifiers by default that do not fall under the exemptions reserved for simple anonymous audience measurement. Consent must be collected before the tags fire, through a banner that offers a genuine choice between accepting and refusing, with no pre-checked box or path steering users toward acceptance.

How can Google Analytics 4 be made GDPR compliant in practice?

Compliance combines several settings: enabling Consent Mode to adapt collection to the user’s choice, reducing the data retention period to what is strictly necessary, limiting the signals sent to Google’s advertising products, documenting the processing in the GDPR records, and informing visitors in the privacy policy. No single setting is enough on its own.

What is the difference between Google Analytics 4 and Universal Analytics regarding GDPR?

Universal Analytics, now discontinued by Google, relied on a session based collection model close to the one that had prompted the first alerts from European authorities. Google Analytics 4 introduced shorter default retention settings and native consent handling through Consent Mode, but the issue of transfers to the United States remains common to both versions.