Enhanced Conversions is a feature Google Ads offers to improve the accuracy of conversion measurement. The goal is to close the gap where cookie-based matching falls short, using encrypted customer data.
This feature isn’t a new conversion tag — it adds an extra matching layer on top of your existing conversion measurement. Some of the conversions lost to browser restrictions like Safari ITP or consent declines under GDPR/Consent Mode can be re-matched through this additional layer. For example, if 15% of conversions aren’t matching under standard cookie-based measurement, Enhanced Conversions can recover part (not all) of that loss; the recovery rate depends on the account’s traffic profile.
Google’s Enhanced Conversions documentation explains that the feature encrypts customer data (email, address, etc.) with SHA256 before sending it to Google, where it’s matched against Google account data. The same documentation notes that conversions from offline transactions can also be tracked this way.
What Is Enhanced Conversions?
Enhanced Conversions is a feature that aims to improve the matching rate by adding encrypted customer data to an existing conversion tag.
Not a new tag — an added layer
The setup is added alongside your existing conversion tag (via the Google Ads tag, GTM, or Conversions API). It doesn’t replace the tag itself; it feeds it an extra data source.
Covers both web and offline conversions
Both conversions that happen on the site and offline conversions the sales team later enters into a CRM can be passed to Google Ads through this method. For example, a user fills out a form on the site, and the sales team closes the deal by phone two weeks later; once that deal is logged in the CRM, it can be matched back to the original ad click using the email address from the form.
How Is the Data Encrypted?
Customer data isn’t sent in raw form — it’s one-way hashed using the SHA256 algorithm.
One-way hashing can’t be reversed
Data hashed with SHA256 can’t be converted back to its original form. That means no plain-text email or phone number is sent to Google — only a digest usable for matching is transmitted.
Format consistency affects match rate
Small formatting differences, like lowercasing an email address or trimming whitespace, can change the match rate. For example, if a form field captures “Ahmet.Yilmaz@Firma.com” with a stray space and it isn’t normalized before hashing, it may not match the same person’s “ahmet.yilmaz@firma.com” entered elsewhere. These details need to be checked after setup.
When Should This Be a Priority?
It’s not equally urgent for every account; in some setups the impact is far more visible.
Safari/iOS-heavy traffic
For accounts losing cookie data to Safari ITP, Enhanced Conversions can recover part of the missing conversions. If a significant share of traffic comes from Safari or iOS apps, this setup should be prioritized ahead of other accounts.
Regions with a high consent-decline rate
Where the consent-decline rate is high under Consent Mode, matching on encrypted data can partly close the measurement gap.
B2B campaigns with long sales cycles
In B2B models where the sale closes in the CRM weeks after the form fill, transferring offline conversions is especially valuable; without Enhanced Conversions set up, it can be largely invisible which campaign generated the leads that turned into sales.
Pre-Launch Check
To confirm the setup is working correctly:
- Does encrypted data submission show as “active” in the Google Ads diagnostics tool?
- Is the match rate being monitored after setup, or was it left as a one-time configuration?
- If offline conversion import is in use, is the data format consistent between the CRM and Google Ads?
Common Mistakes
The most common mistake is completing the setup and never checking the match rate again. A formatting error or a missing field can keep the match rate low, leaving the setup “installed but not working.”
The second mistake is treating Enhanced Conversions as a standalone fix. This layer reduces the loss in cookie-based measurement, but doesn’t bring it to zero; combined with other methods like server-side tagging, it produces a more complete measurement picture.
Summary
Enhanced Conversions is an added layer that strengthens conversion matching using encrypted customer data. It doesn’t close the entire measurement gap on its own, but it can reduce the impact of restrictions like Safari ITP and consent declines. To see the setup’s value, the match rate needs regular monitoring and the data format needs to stay consistent.