Pixel Tracking (Email)
01 Definition
Pixel Tracking (Email) meaning: Using a tiny hidden image to detect when an email is opened.
Pixel tracking places a small, usually invisible image in an email. When a recipient's client loads that image from the sender's server, it records an open. The method underpins open rate reporting but fails when clients block images or prefetch them, which can undercount or inflate opens.
Also called
Why it matters
How Pixel Tracking (Email) fits the work
It is the standard way email tools measure opens, making it the foundation of open rate and many engagement-based automations.
In context
An email platform embeds a one-pixel image, and when a subscriber's client loads it the open is logged in the campaign report.
Practical note
Image blocking hides real opens while privacy proxies and prefetching create fake ones, so pixel-based open counts are approximate and increasingly unreliable.