Google Enhanced Conversions, Offline Conversion Import and Consent Mode: A Technical Setup Guide

Why this matters more every year

Google's bidding systems now decide most of what an account does: which queries to match, which channels to fund, what text to show. They learn from conversion data. When that data is incomplete, because of cookie loss and consent refusals, or low quality, because it counts every form fill equally, the systems optimise toward the wrong thing. Fixing measurement is the highest-leverage work in most Google Ads accounts we audit. See how to audit your own ad account.

Enhanced conversions for web

When a conversion happens, enhanced conversions sends hashed customer data from the page, such as email, phone, name and address, along with the conversion tag. Google matches it to signed-in Google accounts to recover conversions that cookies miss. Set it up through the Google tag, Google Tag Manager, or the Google Ads API. Normalise before hashing: lowercase and trim emails, use E.164 phone format with country code. Then check the diagnostics in the conversion action; Google reports coverage and errors.

Enhanced conversions for leads and offline import

For lead generation, the sale happens later, on the phone or in a meeting. Enhanced conversions for leads captures hashed email or phone when the form is submitted, then lets you upload later outcomes from your CRM, such as qualified, proposal or won, matched on the same hashed data. The older method, GCLID import, matches on the click ID stored with the lead; it still works but loses more matches when the click ID is missing.

You can upload through Google Ads Data Manager, a scheduled file, a CRM integration such as HubSpot or Salesforce, or the API. Upload with conversion values where you can: a won deal worth INR 5 lakh should count for more than one worth INR 50,000. Then move bidding to value-based strategies once you have steady volume. This is how we handle it in our CRM builds and signal infrastructure work.

Consent mode v2

Consent mode passes the user's consent choices to Google tags through ad_storage, analytics_storage, ad_user_data and ad_personalization signals. Google requires it for advertisers who want to use personalised advertising and remarketing for users in the EEA and UK. In advanced mode, tags load before consent and send cookieless pings when consent is denied, which lets Google model some conversions; in basic mode, tags do not load until consent. Use a certified consent management platform and test both accept and reject paths. See UK cookie consent for advertisers. This is not legal advice.

For India, the USA, the UAE and Canada, consent mode is not mandatory in the same way, but privacy laws such as India's DPDP Act and several US state laws still apply.

A clean conversion setup

One primary conversion per goal. Mark the action you actually want, such as qualified lead or purchase, as primary. Set micro-actions like page views or button clicks as secondary so they are reported but not bid on.

Values that reflect money. Use real order values, or estimated values by lead stage.

Adjustments. Upload retractions and restatements for refunds and cancelled orders.

Weekly reconciliation. Compare Google-reported conversions with your CRM or store. Big gaps mean broken tags or duplicate firing.

Market notes

In the UK, consent rates often sit well below 100 per cent, so advanced consent mode and enhanced conversions matter most there. In the USA and Canada, high CPCs make every recovered conversion valuable to bidding. In India and the UAE, WhatsApp and phone leads are common, so recording them in a CRM and importing outcomes is the real fix. See WhatsApp follow-up.

Sources

Google Ads Help: about enhanced conversions; Google Ads Help: enhanced conversions for leads; Google: consent mode.

Frequently asked questions