How to link GA4 to Google Ads and import conversions from GA4

To link GA4 to Google Ads means connecting your Analytics 4 property to your Google Ads account so data flows between the two: audiences, session data and, if you want, conversions. But the link itself is not the hard part. The real decision comes right after: do you let your conversions count through the Google Ads tag, or do you import them from GA4? That choice determines how you bid, how Google optimises and whether you count twice. In this guide you will see how the link works and, above all, how to choose between both measurement methods without polluting your data.

This page is part of our overview of search engine advertising. If you want to understand where SEA fits into your growth engine first, read that pillar; here we go deep on the link itself.

What exactly does the link between GA4 and Google Ads do?

The link is a setting in your GA4 property (under Admin, in the product links) that lets you connect a specific Google Ads account. Once it is in place, three things happen.

• Audience sharing. GA4 audiences, for example everyone who visited your pricing page but never requested anything, become usable for remarketing in Google Ads.
• Richer campaign data. In GA4 you see your Google Ads campaigns, costs and clicks next to your on-site behaviour, so you can connect traffic to behaviour.
• Conversions become available. GA4 conversions (key events) can be imported into Google Ads as a conversion action.

Pay attention to that third point. The link makes importing possible, but it does not automatically switch anything on as a counted action for bidding. Many people assume that after linking “everything is measured”. That is not true. You are still fully in charge, and that is exactly where the import decision begins.

The core question: import GA4 conversions or use the Google Ads tag?

For every valuable action, a quote request or a demo for example, you can measure in two ways. Both work, but they do not measure the same thing, and you pick one per action.

Option A: the Google Ads tag (native conversion tracking)

Here you place the Google Ads conversion tag directly on your site, usually through Google Tag Manager, and it fires on a thank-you page or a form event. Measurement happens at click level inside the Google Ads ecosystem.

• Upside: fast, direct measurement per ad click, with click-based attribution and its own conversion window. For bid optimisation this is the signal Google likes best, because it sits close to the interaction.
• Downside: the tag only sees Google Ads traffic. You miss the broader context of how a visitor moved across channels before converting.

Option B: import a GA4 conversion

Here GA4 measures the action as a key event, and you import it as a conversion action into Google Ads. The counting follows GA4 logic.

• Upside: session-based measurement with cross-channel context. You use the same definition of a conversion in your analysis and in your campaigns, which keeps your reporting consistent.
• Downside: GA4 applies a different attribution model and counts per session, not per click. Conversions often show up slightly later and the numbers can differ from the tag. That is not an error, but it explains why the figures never match one to one.

The rule that holds it all together: pick exactly one source of truth per conversion action. If you count the same request through both the Google Ads tag and a GA4 import, Google counts double and your bidding strategy runs on inflated numbers. One action, one measurement method, applied consistently.

How do you choose between the two?

There is no universally right answer, but there is a logical preference per situation. Think in terms of what you are going to do with the data.

For most B2B accounts we take over, a combination works best, as long as you do not count twice: the Google Ads tag for the hard lead actions you bid on, and GA4 as the analysis layer that tells the broader story. What you really want to avoid is half-finished work, where both systems partly count the same action and nobody knows which number is right any more.

The step that finally makes the link valuable: lead value and offline closings

This is where the wheat is separated from the chaff. The link and the import decision settle that you measure. They do not settle what that measurement is worth. And in B2B, that distinction is half the story.

Counting a conversion only tells Google that a lead came in. It does not tell Google whether that lead is worth 200 or 20,000 euros. So give your conversions a value, based on your lifetime value times your close rate, so Google optimises towards revenue instead of volume. We work that principle out further in our guide on Google Ads conversion tracking.

And even then one gap remains. In B2B you rarely close online; a request becomes a signed contract weeks later. By feeding that offline closing back, you see not only which campaign brought leads, but which campaign brought customers. That is exactly why we do not stop at a successful link. As a google ads specialist we build the measurement so it registers pipeline, not clicks that look good in a report. The link is the pipe; lead value and the offline import are what flows through it.

Common pitfalls when linking

• Double counting. The classic: the Google Ads tag and a GA4 import for the same action. Pick one.
• Mistaking differences for errors. GA4 and Google Ads count differently because of attribution windows and counting methods. A deviation is normal, not a bug.
• Import and forget. An imported conversion is sometimes set to secondary and then does not count for bidding. Check that your real lead actions are set to primary.
• Not assigning a value. Without a conversion value, Google steers on volume, not on quality. For B2B that is rarely what you want.
• Skipping consent. Without correct consent signals, measurements drop out and both systems run on incomplete data.

Suspect that your account is already double counting? How to trace and clean up existing double counts and ghost conversions is covered in cleaning up false-positive conversions.

Frequently asked questions

Do I have to link GA4 before I can import conversions?

Yes. The product link between your GA4 property and your Google Ads account is the condition for importing GA4 key events as a conversion action. Without the link, importing is not possible.

Why do my GA4 conversions differ from my Google Ads conversions?

Because they count differently. Google Ads uses click-based attribution within its own window, GA4 counts per session with a different model. That is why the numbers diverge. Pick one source of truth per action and do not compare apples with pears.

Can I use both the Google Ads tag and a GA4 import?

For different actions, yes; for the same action, no. You measure one lead action with one method, otherwise you count double and steer your bidding on inflated numbers.

Which is better for bidding strategies?

Usually the Google Ads tag, because click-based, direct signals fit automated bidding best. A GA4 import is stronger for cross-channel analysis and a consistent conversion definition.

Am I in control of this myself, or does the link handle it automatically?

You stay in control. The link makes sharing and importing possible, but you decide which conversions count for bidding, what value they get and whether you feed offline closings back.

Want measurement that counts pipeline, not clicks?

Linking GA4 takes ten minutes. Building measurement that steers your budget towards real customers is the actual work: the right import decision, a lead value that holds up, and offline closings that flow back into your campaigns. We set that up, connect it to your sales figures and keep your tracking clean with every change. Small team, quick on our feet, and honest when Google Ads is not the right lever. Book your free intake