What it does
The pixel fires when a visitor takes an action, a page view, a lead form, a purchase, and reports it back to Meta. Those events let you build retargeting audiences of people who visited but didn't convert, measure which ads drove conversions, and give Meta's algorithm the signal it needs to optimize delivery. Installed is not the same as working, so verify it with test events.
Why it beats interest targeting for B2B
Pixel audiences are built on what people actually did on your site, not what they self-declared in a profile, so they're accurate where Meta's interest-based B2B targeting leaks. Since browser privacy changes cut client-side signal, most accounts now pair the pixel with the Conversions API (server-side events) to recover measurement. We cover where Meta fits in Meta's B2B targeting is built on self-declarations. The events it records are what you pick from when choosing an optimization event, and too rare a choice leaves the ad set learning limited.
Common questions
What is the Meta Pixel?
It is a piece of JavaScript on your website that tracks visitor actions and sends them to Meta. Those events power retargeting audiences, conversion measurement, and ad optimization.
Do you still need the Meta Pixel with the Conversions API?
Yes. The Conversions API sends events server-side to recover signal lost to browser restrictions, but it works best alongside the pixel, not instead of it. Most accounts run both and deduplicate the events.