Cookieless tracking is here. Most marketers are not ready.
What Consent Mode v2, server-side tagging and the end of third-party cookies mean for your conversion data — and what to do about it.
Third-party cookies are functionally dead. Apple killed them on iOS five years ago, Chrome is finishing the job now. Here is how to track conversions in 2026 without breaking the law or losing all your data.
What actually changed
Apple ITP, Chrome’s Privacy Sandbox, and the GDPR/ePrivacy enforcement push have collectively reduced the lifespan of a tracking cookie from ~2 years to ~7 days on most browsers. The implication: any conversion that happens more than a week after the click is invisible to default tracking.
Server-side tagging
Move your tag manager off the user’s browser and onto your own server. This restores cookie lifetime to whatever your domain allows (usually 30–90+ days), improves site speed, and gives you a privacy-respecting way to pass first-party data to ad platforms.
Consent Mode v2
Google’s Consent Mode v2 lets you tell Google whether the user consented to ad and analytics cookies. If they did not, Google still receives “consentless pings” — anonymised signals it uses to model the conversion. Properly implemented, you recover 30–50% of the data you would otherwise lose.
Conversion APIs
Meta CAPI, TikTok Events API, LinkedIn Conversions API, Google Enhanced Conversions. All of them let you send hashed first-party data from your server to the platform. All of them improve data quality. All of them are underused.
First-party data strategy
If you do not have a first-party data strategy, build one. Email captures, account creation, loyalty programmes, gated content — whatever fits your business. First-party data is now the foundation everything else depends on.
Modelled conversions
Expect 20–40% of your conversion data in 2026 to be modelled (statistically estimated) rather than directly observed. This is normal, and not a problem if the model is well-fed. It is a problem if you are trying to do precise day-on-day attribution — accept that those days are gone.
Need help with this?
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