Google Ads bidding is only as good as the conversions you feed it. If half your enquiries never get recorded, smart bidding learns from the wrong half and budget drifts toward the campaigns that happen to be measured, not the ones that perform.
Cookie restrictions in browsers such as Safari and Firefox, consent requirements and ad blockers all chip away at tracking. Three tools, configured properly, recover most of what is lost.
Consent Mode v2: required for users in the EEA
Consent Mode passes each visitor’s consent choices to Google tags so they behave accordingly. Version 2 added two signals, ad_user_data and ad_personalization, and since March 2024 Google has required them for advertisers who want to keep using measurement, remarketing and personalisation features for users in the European Economic Area. It applies to any advertiser reaching those users, wherever the business is based.
There are two implementations. In basic mode, tags do not load until the visitor consents. In advanced mode, tags load with default denied settings and send cookieless pings, which lets Google model conversions for visitors who declined. Choose with your legal adviser; either way, use a certified consent management platform and test that consent states change what the tags send.
Enhanced conversions: first-party data, hashed
When someone submits a lead form or completes a purchase, enhanced conversions send details they provided, such as an email address or phone number, hashed with SHA-256, alongside the conversion. Google matches them to signed-in accounts to attribute conversions that cookies alone would miss. Hashing happens before the data leaves the browser or your server, and it should be covered by your privacy policy and consent flow.
Offline conversion import: track the sale, not just the form
For businesses that close deals by phone, email or in person, the form fill is not the outcome you want to optimise for. Capture the click identifier (GCLID) with each lead in your CRM, then send back the stages that matter, such as qualified lead and closed deal, with their values. Bidding then learns which searches produce revenue, not just enquiries.
Common mistakes we fix in audits
- The same conversion counted twice, once from Google Analytics and once from a Google Ads tag.
- Page-view conversions on a thank-you page that can be reached without submitting anything.
- Micro-actions such as button clicks set as primary conversions, so bidding chases cheap clicks.
- No conversion values, which stops value-based bidding from telling a small order from a large one.
- Consent banners that look compliant but do not actually change tag behaviour.
Check it end to end
Use Tag Assistant and the diagnostics in Google Ads to confirm each conversion fires once, with the right value and consent state. Then reconcile Google Ads against your CRM monthly. If the two disagree badly, fix measurement before touching bids or budgets.
