What is UTM Parameters?
Short text codes added to URLs that tell GA4 exactly where traffic came from (Source, Medium, Campaign).
UTM stands for "Urchin Tracking Module" (a callback to the software Google bought to create Google Analytics natively). They are the backbone of digital marketing attribution.
Without UTMs, GA4 has to guess where traffic came from by looking at the HTTP Referrer. If a user clicks a link in an email client or a native social media app, there is no referrer, and GA4 categorizes the traffic as "Direct" (unknown).
The Core 3 Parameters:
- utm_source: The specific site or platform sending you traffic (e.g.,
facebook,newsletter,google). - utm_medium: The overarching channel category (e.g.,
cpc,email,social). - utm_campaign: The specific promotion or product launch (e.g.,
summer_sale_2026).
Example: url.com?utm_source=facebook&utm_medium=cpc&utm_campaign=retargeting
You can easily generate and validate these links using our free UTM Builder.
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