Enhanced Conversions: How One Change Lifted Campaign Performance by 40%

Turning on Enhanced Conversions — one change in the settings, no campaign edits, no new creative — meant Google Ads started seeing conversions it previously knew nothing about. Smart Bidding got more accurate data. And within a month, campaign performance was back where it should have been.

This isn't an isolated case. Google reports that Enhanced Conversions lift the number of tracked conversions by 5% on Search and 17% on YouTube. An independent study by Workshop Digital across multiple accounts showed an average lift of +16%, ranging from -3% to +33%. And campaigns that receive more accurate data naturally achieve better CPA and ROAS — because Smart Bidding finally knows what works.

This article is about why, in 2026, Enhanced Conversions is the most important setting you probably don't have turned on — and what happens when you do.

Why Enhanced Conversions Change Campaign Performance (not just tracking)

Most people think of Enhanced Conversions as a "tracking improvement." That's true, but it's only half the story. The other half — the more important one — is the impact on Smart Bidding.

How Smart Bidding works with data

At every auction, Smart Bidding decides how much to bid for a click. It makes that decision based on historical data — which clicks led to conversions, from which users, in what context. The more conversions it sees, the more accurate its decisions.

Now imagine that 20% of conversions are invisible. A user clicked your ad on their phone at work, browsed the product on a tablet in the evening and bought it on a laptop at home. Without Enhanced Conversions, those are three separate sessions and Google sees no conversion at all. With Enhanced Conversions, Google connects all three steps via the hashed email and attributes the conversion to the ad click.

What that means in practice:

• Smart Bidding sees more conversions → it better identifies which audience segments convert
• CPA drops → the algorithm targets the users who actually buy more precisely
• Budget is allocated more efficiently → money goes where the data shows results, not where conversions are missing because of poor tracking

This isn't a theoretical scenario. Studies show that in practice campaigns with Enhanced Conversions achieve 40–60% better results — not because the campaign changed, but because the quality of the data the algorithm works with changed.

Enhanced Conversions for Web vs. for Leads — what's the difference

There are two variants, and each solves a different problem.

Enhanced Conversions for Web

This is the variant for e-shops. On a purchase (or another online conversion), the tag sends hashed customer data — typically the email, optionally the phone number and address. Google matches it against signed-in Google accounts and attributes the conversion.

Who it's for: E-shops, SaaS with online sign-up, any business where the conversion happens online.

What to send: The minimum is the email. Ideally email + phone + name + address. The more data, the higher the match rate.

Enhanced Conversions for Leads

This is the variant few people know about, yet for many businesses it's more important than the first one.

How does it work? Someone fills in a form on your site (an inquiry, a registration, an e-book download). Enhanced Conversions for Leads sends the hashed email. Later — say a week or a month on — you upload data from your CRM about who became a customer. Google attributes the offline conversion to the ad click via that hashed email.

Who it's for: B2B companies, services, real-estate agencies, insurers, financial advisors — anyone where time passes between first contact and closing the deal. But also e-shops with phone orders or pickup points.

Why it matters: Without Enhanced Conversions for Leads, Google only sees the form submission, not the actual sale. Smart Bidding then optimizes for "cheap forms" instead of "forms that lead to sales." Lead quality drops and you get the feeling that Google Ads doesn't work.

With Enhanced Conversions for Leads, Smart Bidding can optimize for "forms that became customers." That's a fundamental difference.

What the Data Says: Before vs. After

Google's numbers (medians across accounts)

Independent case studies

Workshop Digital (multiple accounts, various industries):

• Average lift: +16% in tracked conversions
• Range: from -3% to +33% (depending on how many conversions were previously "lost")
• 4 out of 5 accounts tested recorded an improvement
• Results visible within 2–4 weeks of turning it on

Important context for the "40–60%" figure: This often-quoted number refers to the improvement in campaign performance in environments with high cookie opt-out rates (typically EU markets). It's not +40% conversions — it's a 40–60% improvement in campaign efficiency thanks to more accurate data for Smart Bidding. The distinction matters, but the result is just as impressive.

Match Rate: The Key to Making It Actually Work

Enhanced Conversions only work as well as your match rate — that is, the percentage of conversions where Google successfully matches the hashed data to a Google account.

Typical match rate: 30–60%. That means Google finds a match for 30–60% of conversions. The rest stays unmatched.

How to raise your match rate

Send more data fields. Email only → match rate ~35%. Email + phone → ~50%. Email + phone + name + address → 60–70%+. Every additional field increases the chance of a match.

Collect the email as early as possible in the checkout process. If the customer only enters their email on the confirmation page and closes the browser before that, you don't have the data. Collect the email at the start of checkout.

Normalize the data. Lowercase, no leading or trailing spaces, a consistent phone-number format. Google hashes the exact string — "jan@email.cz" and "Jan@email.cz" produce different hashes.

Verify the implementation. In Google Ads → Tools → Conversions → Diagnostics you'll see the match rate and any errors. Check it at least once a month.

The Most Common Mistakes That Kill the Effect

1. Turning it on and not verifying

Plenty of e-shops have Enhanced Conversions "turned on" in Google Ads, but no data is actually being sent — the tag isn't configured correctly, data-field mapping is missing, or empty values are being sent. Turning it on isn't enough. You have to verify in diagnostics that the data is arriving and the match rate is non-zero.

2. Sending email only

As we mentioned above — email alone gives a match rate of around 35%. That's better than nothing, but adding a phone number and address gets you to 60%+. The difference in data quality is dramatic.

3. Incorrect data format

Google hashes the exact string. An extra space, a capital letter, a missing country code on the phone number — all of it lowers the match rate. Most GTM implementations handle this automatically, but custom implementations often don't.

4. Duplicate implementation

Do you have Enhanced Conversions turned on via GTM and via the Google Ads interface at the same time? Or via a Shopify plugin and GTM at once? Duplication inflates your numbers and misleads Smart Bidding. Always keep a single source.

5. Not setting up Enhanced Conversions for Leads (when you need them)

E-shops with phone orders, B2B companies with a sales cycle — if you don't import offline conversions via Enhanced Conversions for Leads, Google only sees half the picture. And Smart Bidding optimizes for the half it can see.

How This Affects PMax, AI Max and Demand Gen

Enhanced Conversions aren't just about Search campaigns. They affect the entire account:

Performance Max — better data = better audience signals. PMax more precisely identifies which users convert and allocates budget across channels more effectively.

AI Max for Search — more accurate conversion tracking means AI Max better evaluates which new search queries lead to conversions. Without Enhanced Conversions, AI Max can look inefficient even when it's actually generating conversions — you just can't see them.

Demand Gen — for top-of-funnel campaigns, where more time passes between the click and the conversion, Enhanced Conversions are especially important. They capture conversions that would otherwise fall outside the conversion window.

Smart Bidding in general — the algorithm trains on data from the whole account, not just a single campaign. Every captured conversion improves bidding across all your campaigns.

At LK Media, turning on Enhanced Conversions is the first thing we handle with a new client — before any campaign edits at all. Because without quality data, there's no point optimizing.

Conclusion

Enhanced Conversions aren't a luxury or a "nice to have." In 2026, when 30–40% of conversion data disappears because of the cookieless environment, they're a foundational building block of the entire PPC ecosystem. One change in the settings, no campaign edits, visible results within 2–4 weeks.

If you run Google Ads and don't have Enhanced Conversions turned on yet, make it your first step. Before changing campaigns, before new creative, before reallocating budget. Data first — everything else then fixes itself.

Need to check whether your Enhanced Conversions are set up correctly? Write to info@lkmedia.cz — we'll review it and tell you what to fix, if anything.

FAQ

What are Enhanced Conversions?

Enhanced Conversions is a feature in Google Ads that, at the moment of a conversion (a purchase or a form submission), sends hashed customer data — email, phone number, name, address — directly to Google. Google matches it against signed-in accounts and attributes the conversion to the right ad click. All data is encrypted with SHA256; no personal information is ever transmitted in readable form. The result: Google sees conversions that would otherwise disappear.

How do Enhanced Conversions affect my campaign performance?

Directly — not by changing your campaigns, but by giving Smart Bidding more accurate data. You typically see a +5 to +17% lift in tracked conversions, more accurate CPA reporting and a gradual improvement in bidding performance. The impact is greater the more conversions were previously "invisible" — for example in the EU, where cookie opt-out rates are high.

Are Enhanced Conversions GDPR-compliant?

Yes. The data is hashed (SHA256) before it ever leaves the customer's browser. Google never sees the email or phone number in readable form. Google uses this data solely to attribute conversions, not for any other purpose. You do, however, need a properly configured CMP (Consent Management Platform) and the user's consent for marketing cookies.

What's the difference between Enhanced Conversions for Web and for Leads?

Enhanced Conversions for Web measures online conversions (purchases in an e-shop) — the data is sent at the moment of conversion. Enhanced Conversions for Leads connect online forms with offline sales — the form data is hashed and later matched with CRM data about closed deals. E-shops need at least the for Web version. Businesses with a sales cycle (B2B, services, phone) also need the for Leads version.

How do I know whether Enhanced Conversions are working correctly?

In Google Ads, go to Tools → Conversions → select the conversion action → Diagnostics. You'll see the match rate (the percentage of successfully matched conversions), any implementation errors and the status of the data being sent. A match rate above 30% is the minimum, above 50% is good, above 60% is excellent. If you see 0%, no data is being sent — even though you have it "turned on."