Do I need both GA4 and Google Ads conversion tracking?

They serve different purposes. GA4 gives a fuller picture of on-site behavior, while native Google Ads conversion tracking feeds bidding algorithms directly, so most accounts benefit from having both set up correctly.

Why don't my GA4 conversions match Google Ads conversions?

Different attribution models, different lookback windows, and different definitions of what counts as a conversion in each platform commonly cause the numbers to not match exactly, which is expected rather than a sign of a broken setup.

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Google Ads

How to set up conversion tracking with GA4 for Google Ads

Linking GA4 to Google Ads correctly is what makes conversion data trustworthy. Here's the setup that most accounts get wrong.

In short

GA4 needs a properly configured key event, linked correctly to the Google Ads account, before that event can be imported and used for bidding. The most common mistake is importing a GA4 event that fires too easily, like any page view, rather than a genuine sign of purchase intent.

Mark the right event as a key event

GA4 tracks dozens of events automatically, but only events marked as key events are eligible to be imported into Google Ads as conversions. Marking a form submission or purchase completion as the key event, rather than something loose like scroll depth or session start, is what determines whether the imported data actually reflects real business outcomes.

Expect some mismatch between platforms

GA4 and Google Ads use different attribution windows and models by default, so their reported conversion numbers rarely match exactly, and that's expected rather than a sign something is broken. What matters more is that both are tracking the same real event consistently over time, so trends and comparisons within each platform stay reliable.

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