GA4 Server-Side Tracking: How to Stop Losing Conversion Data to Ad Blockers
If your Google Analytics 4 reports show fewer conversions than your CRM, you are not looking at a reporting quirk. You are looking at a data gap — and it is caused by something most marketing teams do not see coming. Ad blockers affect between 25 and 40 percent of web traffic, depending on the industry and device type. Every blocked request is a conversion event your analytics never receives. Browser privacy tools like Safari's Intelligent Tracking Prevention (ITP) compound the problem further by capping the lifespan of JavaScript-set cookies at just seven days. If a customer converts eight days after their first visit, that attribution gets lost entirely. Why Client-Side Tracking Has a Structural Weakness Client-side tracking works by running JavaScript tags directly in the user's browser. The browser then sends the event data to Google Analytics 4. This approach is simple to set up and has worked for years — but browser privacy controls now sit directly in its path. A...