Enhanced conversions

Strengthening conversion measurement with consented first-party customer data.

What it is

Enhanced Conversions improves Google’s ability to match conversions using consented first-party customer information already collected by the organisation, such as email addresses captured through forms or online purchases.

Before the data is sent to Google, it is normalised and securely hashed. Google uses that information to improve conversion matching where browser-based identifiers are unavailable or incomplete, helping recover measurement that would otherwise be lost.

For lead-generation businesses, Enhanced Conversions for Leads extends this approach by connecting CRM outcomes back to the original advertising interaction, allowing Google Ads to optimise towards qualified leads and closed sales rather than form submissions alone.

Why it matters

Browser restrictions, privacy changes and consent requirements have reduced the number of conversions advertising platforms can directly observe.

Enhanced Conversions helps recover some of those lost signals using customer information organisations already collect, improving both measurement and automated bidding.

For lead-generation organisations, Enhanced Conversions for Leads goes a step further by feeding CRM outcomes back into Google Ads. Rather than optimising towards every form submission, campaigns can learn from the leads that ultimately become customers.

What Louder does

Implementation - via Google Tag Manager, server-side GTM or the Google Ads API, chosen against where the identifier actually lives.
Identifier strategy - which fields to send, where they’re reliably present, and how to normalise them before hashing.
Enhanced conversions for leads - CRM integration, upload scheduling, and the join logic that connects a closed deal back to the original click.
Consent integration - sends bounded by the consent actually given, with Consent Mode signals aligned.
Match-rate monitoring - diagnostics when rates drop, which they do silently after front-end releases.

Common challenges

Capturing the identifier after navigation. The tag reads the email from a form that has already been cleared or a confirmation page that never carried it. Coverage looks fine in preview and collapses in production.
Leads uploaded without the original hash. Enhanced conversions for leads needs the same normalised hash on both sides of the join. CRMs that store a differently formatted version of the address break the match entirely.
Treating it as a substitute for server-side. Enhanced conversions improve matching; they don’t address the underlying loss of the conversion event itself. Organisations frequently implement it and stop, leaving the larger recovery unaddressed.
No consent gating. Sending hashed personal data regardless of consent state creates a compliance exposure that is difficult to argue was accidental, given the implementation is deliberate.