Full Definition
Conversion tracking is the foundation of data-driven marketing. Without it, you're spending money on ads or SEO and hoping it works. With it, you know precisely which campaign, keyword, ad, and landing page combination is producing customers — and which is wasting budget. The main conversion tracking setup paths: **Google Ads conversion tracking**: A small piece of JavaScript (a 'tag') placed on your 'thank you' page fires when a visitor reaches it after submitting a form. Google Ads then attributes that conversion to the ad click that preceded it. **Google Analytics 4 (GA4) Goals / Key Events**: GA4 tracks conversions as 'Key Events.' You define what counts as a conversion — a form submit, a button click, a page visited — and GA4 records each occurrence with attribution data. **Phone call tracking**: Services like CallRail or Google's call reporting assign unique phone numbers to different traffic sources. When a call comes in, the system records which ad or page triggered it. **GA4 + Google Ads link**: Importing GA4 Key Events into Google Ads allows Smart Bidding to optimise for these more sophisticated conversion signals. Common conversion tracking mistakes: - Tracking 'page views' of the thank-you page rather than unique form completions (inflated data) - Not excluding internal traffic (your own team's visits skew conversion rates) - Forgetting to track phone call conversions — critical for local service businesses where most sales happen by phone Actionable tip: Verify your conversion tracking is working before spending on ads. Submit a test form and check in real-time whether Google Ads or GA4 records the conversion. This 10-minute check has saved countless businesses from months of misattributed spend.