Google Ads says your Google tag is not detected
When Google Ads cannot detect your tag or verify a conversion action, it optimizes blind and your reported conversions undercount. The tag is usually present but not firing where Google checks.
Signs this is happening to you
- Google Ads shows "Google tag not detected on your website"
- A conversion action is stuck as unverified or "No recent conversions"
- Tag Assistant cannot find the tag on key pages
- Ads conversions are far lower than your real Shopify orders
What's usually causing it
- The tag is not on the conversion pageIf the tag or the conversion event is missing from the page where the purchase completes, Google never sees the conversion.
- The conversion event does not fire on purchaseThe base tag can load while the conversion event itself fails, so the action stays unverified.
- Checkout extensibility moved where tags runAfter Shopify's checkout changes, tags added the old way no longer fire on the new checkout.
- Consent or a blocker strips the tagDenied consent or an ad blocker can prevent the tag from loading for a share of users, which Google reads as missing.
How Mimetic finds it and ships the fix
Mimetic runs a real conversion on your site and verifies whether the Google tag and the conversion event actually fire, so you fix what Google is failing to detect.
- We load your pages and confirm whether the Google tag fires
- We complete a purchase and check whether the conversion event sends with the right value
- We flag the page, the consent block, or the checkout change responsible
- We open the fix as a pull request so the conversion is detected and verified
When Google cannot verify your conversion action, Smart Bidding optimizes without conversion signal, so fixing detection often improves performance, not just reporting.
Questions
Why does Google Ads say my tag is not detected when it is installed?
The base tag can be present while the conversion event fails to fire on the purchase page, or the tag is missing from the exact page Google checks. Mimetic runs the conversion and reports what actually fires.
Will this affect my Smart Bidding?
Yes. An unverified conversion action starves Smart Bidding of signal, so it optimizes blind. Restoring detection often improves performance as well as reporting.
Could my Shopify checkout upgrade have caused this?
Often, yes. Checkout extensibility moved where tags run, so conversion tags added the old way stop firing on the new checkout. Mimetic catches that specifically.