Google shopping conversions

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Topic summary

Issue: A Shopify store running Google Ads Performance Max (PMax) sees a conversion gap. Shopify logs 56 orders in a day, but Google Ads counts 42. Of the remainder, 6 are direct and 8 are “unknown” in Shopify that resolve to Google Shopping, yet these aren’t attributed as conversions in Google Ads.

Likely causes: Tracking/integration mismatches between Shopify and Google Ads/Analytics, missing or inconsistent UTMs (tracking tags), and modern privacy limits (users blocking/opt‑out), which can prevent Google Ads from attributing conversions even when Shopify records orders.

Recommended actions:

  • Verify Shopify ↔ Google Ads/Analytics linking and ensure conversion actions in Google Ads match Shopify events.
  • Standardize UTM parameters and consider implementing Google Tag Manager for cleaner tracking.
  • Enable Enhanced Conversions (uses first‑party data to improve attribution).
  • Optional: try a Shopify app (e.g., “Nabu for Google Ads Pixel”) to tighten conversion capture.

Resources shared: A YouTube walkthrough on Enhanced Conversions and a Google support article.

Status: No confirmed fix yet; guidance provided, resolution pending.

Summarized with AI on December 15. AI used: gpt-5.
1

So I run a performance max campaign and for some reason my conversions read just fine and have for years but I started digging a little more because it didn’t seem like all of my conversions were being counted. I started looking through the data on Shopify and I keep seeing an “unknown” source on some of the orders conversion data, when I click it, it’s coming up as google shopping. My ads account is not registering these as conversions because of it. Yesterday I had 56 total conversions with only 42 of them being counted. 6 were direct visits. The other 8 where from an “unknown” source which was google shopping. Any advice would be amazing on how to fix this

2

@Hondzilla Hey It sounds like a tracking issue between Google and Shopify. To fix this, I recommend checking that your Google Shopping and Performance Max campaigns are fully integrated with Shopify, especially in terms of conversion tracking. Make sure your Google Analytics and Google Ads accounts are linked correctly, and verify that conversion actions in Google Ads match your Shopify events. Adjusting UTM parameters may also help track “unknown” sources more accurately. If needed, consider using Google Tag Manager for more precise tracking.

3

Tracking, nowadays, has not been accurate anymore, for example users opt out of tracking, or block tracking.

While you can see data in Shopify, that means in Google Ads, it’s not possible.

You can enable enhanced conversion tracking to increase the chances of getting those missing conversions.

Have a look here:

4

Hey!

There seems to be an error in the conversion tracking from Google’s end. You can rectify this by verifying that your conversion tracking is set up accurately and is recording all the necessary conversions.

Check out this article by Google to get deeper insights.

https://support.google.com/google-ads/answer/13321563

Additionally, as a Shopify user, I recommend downloading Nabu for Google Ads Pixel.

This app ensures pinpoint accuracy in conversion data and is specially curated for Google Shopping.