Server-side tagging

Server-side tagging moves the last leg of tracking off the browser and onto a server the site owner controls, typically hosted on the site's own domain. The browser sends event data to that server-side container once, and the container forwards it on to analytics and advertising vendors server-to-server.

This differs from a conventional tag management setup, where each vendor's tag runs directly in the browser and makes its own outbound request. Because the server-side container looks like first-party data traffic to the browser, it is less affected by ad blockers and browser tracking-prevention features that specifically target third-party scripts and cookies, and it can enrich or filter events—for example stripping personal data—before they leave the organization's control.

The main benefit is data completeness and better governance: the site owner sees and can filter exactly what leaves its systems before any vendor does. It does not, however, replace the need for consent mode or a valid legal basis for processing—consent decisions still have to be honored inside the server container. The trade-off is added infrastructure to build, host, and maintain compared with a purely client-side data layer setup.