Every analytics or advertising pixel is a small piece of code that reports what a visitor did. The only real question is where that code runs. The answers below are written for developers who get asked about it by marketers, and for marketers who want to ask better questions.
Where does client-side tagging run?
In the visitor's browser. The page loads, a tag manager loads, and each vendor script loads after it and sends its own report. This is quick to set up, and marketing can change tags without a code release. The costs are extra weight on every page, scripts that browser privacy settings and ad blockers can stop, and every vendor receiving data straight from the visitor's device.
Where does server-side tagging run?
On a server you control. The browser sends a single stream of events to an endpoint, often on your own domain, and that server passes the relevant pieces on to each vendor. The benefits are fewer scripts on the page, tighter control over what leaves your system, and one sensible place to strip out personal details before forwarding. The costs are real: a server to host, monitor and pay for, engineering time, and failures that are harder to see than a missing script.
Does server-side mean consent no longer matters?
No. Consent concerns the data and its purpose, not the location of the code. If a visitor declined a type of tracking, your server should honour that choice before anything is forwarded. Treat it as a stricter checkpoint, not a loophole.
Is one more accurate than the other?
Server-side can recover some events that blockers would drop, but it does not fix a poor event plan. If the names are inconsistent or nobody agrees what counts as a lead, moving the code changes nothing about the quality of the answers.
Which should a small site choose?
Start client-side, with discipline: a written list of events, clear names, and a regular clear-out of tags nobody uses. Move server-side when a specific problem justifies it, such as heavy pages, provable data loss, or a need to control exactly what is shared.
Choosing the tooling comes after deciding what is worth measuring. That planning sits at the heart of the strategy and intelligence services at Gorilla Vibe, which suits teams who want their measurement to follow the business question, not the other way round.
Written with AI assistance for the Gorilla Vibe marketing team.
Top comments (0)