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What is conversion tracking and why does it break?

Pixels, tags, conversion actions, and the four things that silently stop the data

Conversion tracking is the loop that tells an ad platform which of its clicks turned into something valuable. A tag fires when someone completes an action, the tag reports it back with the identifier from the original click, and the platform credits that campaign. Break any link in that chain and the data stops without an error message.

How the loop works

Someone clicks your ad. The platform attaches a click identifier to the landing page URL. Your site stores it. The visitor submits a form, calls, or buys. A conversion tag fires, reports the action and the identifier back to the platform, and the platform files it against the campaign that earned the click, subject to your conversion window. Google Ads windows are configurable from 1 to 90 days with a default of 30.

The four ways it silently breaks

  • A site change. A redesign, a new form tool, or a developer push that removes the tag or changes the thank you page URL a trigger depends on. This is the most common cause by a wide margin, and nobody notices for weeks.
  • Consent and blocking. A visitor declines cookies, or a browser or extension blocks the request. The person converted. The tag never reported it.
  • Misconfiguration. Counting every conversion instead of one per click, or the reverse. Duplicate tags firing twice. A conversion action with no value assigned. The numbers look plausible and are wrong.
  • The chain past the click. A lead that becomes a customer three weeks later over the phone never gets back to the platform at all unless you build that path.

How to tell it is broken

Check weekly, not quarterly. Watch for a conversion count that hits zero, a cost per conversion that halves or doubles overnight with no budget change, and platform numbers drifting from your CRM lead count in a direction they never drifted before. Test the actual form after every site release. We include tracking verification in every build and every analytics engagement, because a broken tag costs more than any bid strategy ever will.

Related: Why don't GA4 and my ad platform conversion numbers match?, How does cookie consent affect our marketing tracking?, How do you track leads and conversions from paid campaigns?