What Are Enhanced Conversions, and How Do They Boost ROAS?

Over the past few years, the digital advertising world has changed dramatically. Uncertainty around cookies (which have been alternately deprecated and partially reinstated), browser-level tracking restrictions, and growing user privacy awareness have all led businesses to lose a portion of their data. As a result, ad algorithms are increasingly operating in the dark.

In this context, it’s worth paying close attention to a solution that’s already available: enhanced conversions.

What Are Enhanced Conversions?

Enhanced Conversions are not a new event type or a standalone analytics system. They are an extension of your existing conversions that allows you to pass additional user identifiers (email address, phone number, name) in hashed form (SHA-256).

In simple terms, this approach gives ad platforms a better chance of accurately identifying who completed a conversion. This is especially important in an environment where traditional user identification methods (cookies, client-side tracking) are becoming increasingly unreliable.

How Does It Work?

The mechanism is straightforward:

1. A user visits your site and completes a target action — submits a lead form, makes a purchase, registers for a service, etc.
2. If, during that action, they enter personal data (email, phone, name), that data can be passed along with the conversion event.
3. The data is hashed — meaning it is never transmitted in plain text.
4. Google and Meta match this data against their own user bases and attribute conversions that would otherwise have been lost.

This process is known as improved matching or advanced matching.

How Does It Help?

According to Google Ads (Enhanced Conversions):

• Up to +5–15% in recorded conversions.
• Up to +10% improvement in attribution accuracy.
• Better Smart Bidding optimization (particularly for tCPA / tROAS).

According to Meta (Advanced Matching + CAPI):

• Up to +10–20% in attributed events.
• Up to +13% improvement in cost per result.
• Significant increase in match rate (sometimes from ~60% to 80–90%).

These aren’t just marketing promises. In practice, these gains typically come from recovering conversions that were previously going untracked and unaccounted for.

Why This Affects ROAS

An increase in ROAS after implementing Enhanced Conversions doesn’t mean your ads have suddenly become more effective. What actually changes is this: you start seeing a clearer, more accurate picture of what’s already happening.

Previously, a portion of conversions was simply getting lost — due to cookie blocking, browser restrictions, or lack of user consent. In your reports, this made campaigns appear to be underperforming relative to reality.

When an additional layer of user identification is introduced — Enhanced Conversions — the following occurs:

• Those “lost” conversions are returned to your analytics.
• Algorithms receive more data to learn from and develop a better understanding of which users convert.
• Ad delivery optimization improves accordingly.

This also affects audience quality: remarketing and lookalike models are no longer built on limited data but on a more complete pool of real users.

The result is a tangible improvement in performance metrics — not through a strategy change, but through greater data accuracy. In essence, it’s a restoration of lost precision. And that difference in data quality is often what delivers meaningful gains in results.

How to Implement Enhanced Conversions

Google Ads:

• Via Google Tag Manager or gtag.js.
• Pass user_data (email, phone) alongside the conversion event.
• In most cases, it’s sufficient to push data to the dataLayer and process it through GTM.
• Activate Enhanced Conversions in your account settings.

Meta:

• Use Pixel + Conversions API (CAPI).
• Pass user_data (email, phone, external_id).
• Server-side tracking is recommended for maximum impact.

The most effective approach is a combination of client-side and server-side tracking.

Important Considerations

• ❗ Data must be normalized (trimmed, lowercased, no extra spaces).
• ❗ Empty or invalid values must not be passed.
• ❗ User consent must be accounted for (GDPR / CMP compliance).
• ❗ The greatest impact is achieved with sufficient traffic volume.

Conclusion

Enhanced Conversions are no longer just an “optional extra” in your settings that you can put off until later. They are a direct response to how the entire digital advertising ecosystem is evolving.

Cookies are gradually losing their effectiveness, browsers are tightening tracking restrictions, and users are increasingly withholding data consent. In this environment, standard tracking becomes less accurate — and businesses risk making decisions based on incomplete information.

Enhanced Conversions help address this problem. They allow you to recover a portion of the conversions that were previously slipping through the cracks, making your data more stable and reliable. The result: you’re working with numbers that more closely reflect reality, not assumptions.

This is precisely why it directly impacts ad performance. When platforms receive more high-quality signals, they optimize delivery more effectively, find the right users more precisely, and allocate budget more efficiently. That’s the core value: you don’t necessarily spend more — you simply get more out of the budget you already have.

The logic is straightforward: less data loss → algorithms receive more signals → ads perform more accurately → business sees better results.

Want to get the most out of your ad campaigns and work with accurate data? Reach out to the Livepage team — we’ll help you implement advanced tracking to better understand your customer journey and improve ad performance today.