What moves to the server, and why
Server-side tagging runs your tags in a container you control on a server, instead of in the visitor's browser. The browser sends one stream to your server, and the server forwards it to each vendor.
It helps with data accuracy, page performance and resilience to ad blockers and browser tracking prevention. It's most valuable for sites with significant ad spend.
What the Conversions API fixes
The Meta Conversions API sends conversions from your server to Meta, recovering signal the browser pixel loses to ad blockers, tracking prevention and consent choices.
It only works if browser and server events are deduplicated. Each pair shares an event ID, so Meta counts it once. Read: The Meta Conversions API, Explained: What CAPI Actually Fixes (and What It Doesn't)
The three ways it goes wrong
- Double counting. No shared event ID, so Meta counts the same purchase twice.
- Custom events where standard ones belong. Optimization caps out because the platform can't map the event. Read: Standard vs Custom Events: The Meta & TikTok Setting That Quietly Caps Your Performance
- Consent bypass. Moving a tag to the server doesn't remove the need for consent. The server has to respect the same decision the banner captured. Read: Meta Is Removing the Off-Meta Opt-Out. Your Consent Banner Is Now the Only Off Switch.
Is it worth it?
Server-side tagging costs real hosting and engineering time, so it has to earn its place. Read: Server-Side Tagging: Is It Worth the Investment?
Related reading
Rawsoft provides technical implementation and analysis, not legal advice. Please confirm any regulatory interpretation with your counsel.