UTM Parameters
Data & TrackingAlso: UTM · UTM Tags · UTM Codes
Quick definition
UTM parameters are small tags you add to the end of a link so your analytics can tell exactly where a click came from. UTM stands for Urchin Tracking Module, a name left over from an early analytics tool. When someone clicks a tagged link, the parameters travel with them and land in your analytics, letting you attribute the visit to a specific source, campaign and piece of content.
Where it shows up in the data
utm_source, utm_medium and utm_campaign are the core three. utm_term and utm_content are optional and capture keyword and creative detail. Source and medium do most of the reporting work.
Analytics is case-sensitive and literal, so facebook and Facebook are different sources. An agreed, documented, all-lowercase convention is what keeps the data clean.
Never tag internal links between pages of your own site. Doing so restarts the session and overwrites the original source, corrupting your attribution.
What it actually means
A UTM-tagged URL carries up to five parameters that your analytics reads and records. utm_source names where the traffic came from, for example newsletter or facebook. utm_medium names the channel type, for example email or cpc. utm_campaign names the specific campaign. utm_term and utm_content are optional and capture the keyword or the specific creative or link variant. When someone clicks, these values flow into GA4 and most other analytics tools, so instead of a vague clump of referral or direct traffic you can see that a visit came from the March newsletter, the second call to action. The entire value depends on consistency. Analytics treats Facebook and facebook as two different sources, so without a naming convention your data fragments and the reporting becomes untrustworthy.
UTMs are free, simple and constantly botched. The problem is never the tool, it is the lack of a naming convention.
How it shows up
UTM parameters show up in GA4 as the traffic source, medium and campaign dimensions. A properly tagged link turns anonymous direct or referral traffic into a clearly labelled source you can measure and compare.
Where people get this wrong
Related terms
Common questions
What are UTM parameters?
They are tags added to the end of a link so your analytics can record exactly where a click came from. The five fields are source, medium, campaign, term and content, and they flow into GA4 and most analytics tools when someone clicks.
What is the most common UTM mistake?
Inconsistent naming. Analytics treats Facebook and facebook as different sources, so without an agreed convention your reporting fragments. A single documented, lowercase naming standard fixes it.
Should I add UTMs to internal links?
No. Tagging links between pages of your own site overwrites the original traffic source and corrupts your attribution. Only tag links that bring people to your site from an external source.
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New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
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