UTMUrchin Tracking Module
UTMs are URL parameters (utm_source, utm_medium, utm_campaign) that tag traffic so analytics tools can identify where users came from.
What does UTM actually mean?
UTM parameters are URL tags appended to links, originally introduced by Urchin (acquired by Google to become Google Analytics). Five canonical parameters exist: utm_source, utm_medium, utm_campaign, utm_term and utm_content.
The purpose is identification: when a user clicks a tagged link, the UTMs travel with them through the session, and analytics tools (GA4, Mixpanel, Amplitude, Shopify Analytics) record them as the traffic source. Without UTMs, all paid traffic appears as 'direct' or 'referral' and can't be attributed to specific campaigns.
In 2026 most ad platforms generate UTMs automatically (Meta's URL Parameters, Google's auto-tagging via gclid). The discipline is consistency: use the same conventions across platforms so reports can be compared. Most teams document UTM standards in a shared sheet or via a tag-management layer (Hightouch, Workato).
Example
A Meta ad links to https://example.com/product?utm_source=facebook&utm_medium=cpc&utm_campaign=spring_drop. Shopify Analytics groups all sessions with utm_source=facebook as Meta paid traffic.
When it matters
UTMs are the basic identification layer for paid attribution outside the ad platform. Inconsistent UTMs make analytics dashboards unreliable; consistent ones power MMM and SQL-based attribution.
Related terms
GA4
GA4 is Google's event-based analytics platform that replaced Universal Analytics in July 2023. Cross-platform, privacy-friendlier, harder to use.
Attribution
Attribution determines which ad touchpoint receives credit for a conversion, using last-click, first-click, time-decay or data-driven models.
Last-click attribution
Last-click attribution credits the final ad click before conversion with 100% of credit. The default model on most ad platforms; systematically over-credits bottom-funnel.
Pixel
A pixel is a JavaScript snippet on your website that sends user behavior events (pageview, add-to-cart, purchase) back to ad platforms.
Find out which ads actually win.
advrt builds ads around your real product photos, tests them live on Meta and judges each one against your own account. Free plan, no credit card.