What Are UTM Parameters?

What it applies to

Every link in every paid campaign, email newsletter, social media post, and any other external channel where you want to track the source of website visits and conversions in GA4.

How to build UTM parameters

• Use Google's Campaign URL Builder (ga-dev-tools.google.com/campaign-url-builder) to generate UTM-tagged URLs without manual construction.
• Five parameters: utm_source (where: linkedin, google, newsletter), utm_medium (how: paid, email, social, organic), utm_campaign (which campaign: q4-audit-offer), utm_content (which variant: headline-a), utm_term (which keyword, for paid search).
• Create a UTM naming convention document — all team members must use the same naming format for accurate reporting. Inconsistent UTMs (LinkedIn vs linkedin vs LinkedIn-paid) create separate rows in GA4.

Viewing UTM data in GA4

• Reports → Acquisition → Traffic Acquisition — segment by Session Source/Medium to see traffic and conversions by UTM source and medium.
• Reports → Acquisition → User Acquisition — shows the source that acquired each user (their first session).
• Use Explorations → Funnel Exploration — filter by utm_campaign to see how specific campaigns convert through the full funnel.

UTM best practices

• Always use lowercase — GA4 treats "LinkedIn" and "linkedin" as different sources.
• Never use UTMs on internal links — they reset the session source and corrupt attribution data.
• Shorten UTM URLs with Bitly or a custom short domain for cleaner sharing in social posts.