Consent mode

Consent mode is a Google-specific mechanism, built into Google Analytics, Google Ads, and Google Tag Manager, that changes how those tags behave depending on the consent a visitor has given through a cookie consent banner. It is not a generic industry standard, though other vendors have introduced comparable consent signals of their own.

A consent management platform passes consent states—such as ad_storage and analytics_storage—into tag management before tags fire. When a visitor denies consent, Google's tags stop setting cookies and instead send limited, cookieless pings; Google then uses statistical modeling to estimate the conversions and traffic it can no longer measure directly, rather than simply losing that data.

Consent mode matters because it lets sites keep a usable, if partial, measurement signal under regulations like the GDPR and ePrivacy Directive, which require consent before non-essential tracking. It fits into a broader data governance program alongside first-party data strategy and, often, server-side tagging. A key limitation: modeled conversions are estimates, not observed counts, and consent mode only governs Google's own tags—other tools on the same site still need their own consent handling.