Can you track users who reject cookies?
When someone rejects cookies you cannot identify or follow them, and you should not try to. But rejecting cookies does not mean you learn nothing. Here is what you can still measure legally, and how Google fills in the rest.
What you cannot do
If a visitor declines non-essential cookies, you must not set analytics or advertising cookies for them, and you cannot build a profile or follow them across sites. Trying to work around that with fingerprinting or sneaky identifiers is both non-compliant and against platform rules. The honest position is that declined visitors are not individually trackable, and that is the point of the law.
What you can still measure
You can still count the visit in an anonymous, cookieless way through Google’s Consent Mode. When consent is denied, your tags send pings with no identifying cookies, so Google receives a privacy-safe signal that something happened. From those signals, and the behaviour of consenting users, Google models the conversions and visits it cannot measure directly.
How modelling works, briefly
- Consenting users are measured normally and fully.
- Declined users send anonymous, cookieless pings.
- Google uses the known data to estimate the declined conversions and reports them as modelled data.
- You get a realistic total without identifying anyone who said no.
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Check my tracking freeThe honest limits
Modelled data is an estimate, not a per-person record, and it needs enough traffic to be reliable. You will not get user-level detail on declined visitors, nor should you. But at the level that matters for decisions, totals, trends and channel performance, modelling closes most of the gap that a blocking banner would otherwise leave.
The practical takeaway
You do not choose between compliance and data. Respect the rejection, measure the rest anonymously, and let modelling estimate the difference. That requires Consent Mode set up properly, which is exactly where most sites fall short.
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See how it works & pricingRelated guides
Why analytics dropped after a banner Consent Mode v2 explained How consent breaks tracking All guidesDatahound are analytics and ad-tracking specialists. We fix broken GA4, Google Ads, Meta and server-side tracking. See pricing · All guides · Back to datahound.agency
Tracking after rejection: common questions
Can I track someone who rejected cookies?
Not individually, and you should not try. You cannot set analytics or advertising cookies for them or build a profile. You can only count the visit anonymously through Consent Mode, with no identifying data.
What is modelled conversion data?
It is Google’s estimate of the conversions and visits you cannot measure directly because consent was denied. Google uses anonymous cookieless signals and the behaviour of consenting users to estimate the gap, reported as modelled data.
Is it legal to track users who declined cookies?
You cannot track them individually, but counting the visit anonymously through Consent Mode is compliant because no identifying cookies are set. Fingerprinting or hidden identifiers to get around a rejection are not allowed.