What is the difference between a primary and secondary conversion action in Google Ads?

Primary conversion actions are reported in the main Conversions column and are what Smart Bidding uses to optimize. Secondary conversion actions are for observation only and do not influence bidding unless pulled into a custom conversion goal.

Why does my Google Ads account show more conversions but worse lead quality?

This usually means the primary conversion action is set too shallow, such as a form fill instead of a qualified lead. Smart Bidding is maximizing exactly what you told it to maximize. The fix is to move the primary conversion action closer to an actual business outcome.

Are GA4-imported conversion actions used for Google Ads bidding by default?

No. Google sets conversion actions created through the Google Analytics interface as secondary by default, so they do not immediately steer Smart Bidding until deliberately promoted to primary.

How many monthly conversions do I need before Smart Bidding works well?

Google recommends selecting a single funnel stage with a short conversion delay and at least 15 monthly conversions as the bidding goal. Below that volume, the algorithm lacks enough signal to optimize reliably.

What is the fastest way to check if I am training Google Ads on the wrong conversions?

Audit what is marked primary and ask, for each action, whether you would want Google to spend more budget purely to generate more of it. If not, it belongs in secondary.

Do offline conversion imports actually improve Google Ads performance?

Yes. Google reports that advertisers combining first-party data with GCLIDs in offline conversion imports see a median 10% increase in conversions compared to standard offline imports.

Aravind Sundar

Mar 16, 202612 min read

Aravind Sundar

The Revenue Signal Problem: Why Most Google Ads Accounts Are Training AI on the Wrong Conversions

Most Google Ads accounts do not have an AI problem, they have a signal problem: Smart Bidding optimizes for whatever conversion action is marked primary, and if that action is weakly tied to revenue, the account scales the wrong outcome efficiently. This piece explains how to audit primary vs. secondary conversion actions, use value-based bidding and offline imports, and align Smart Bidding with real revenue.

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