What Are UTM Parameters?

UTM parameters (short for Urchin Tracking Module) are small snippets of text you add to the end of a URL. When someone clicks that link, the extra text is passed to your analytics platform — such as Google Analytics — giving you detailed information about where that visitor came from and what they clicked.

Without UTM parameters, traffic arriving at your site from a newsletter, a social post, and a paid ad might all get lumped together under "direct" or misattributed. With UTM tags, each source is clearly labeled.

The Five UTM Parameters

  • utm_source — Identifies where the traffic comes from (e.g., newsletter, google, instagram).
  • utm_medium — Identifies the marketing channel (e.g., email, cpc, social).
  • utm_campaign — Names the specific campaign (e.g., summer_sale_2025).
  • utm_term — Used for paid search to track which keyword triggered the ad.
  • utm_content — Differentiates between multiple links in the same campaign (e.g., banner_top vs banner_sidebar).

The first three — source, medium, and campaign — are the most commonly used and provide the most value for most teams.

What a UTM-Tagged URL Looks Like

Here's a plain URL:

https://example.com/sale

And here it is with UTM parameters attached:

https://example.com/sale?utm_source=newsletter&utm_medium=email&utm_campaign=june_promo

Everything after the ? is the tracking data. It doesn't change the destination — the visitor still lands on the same page. It just tells your analytics tool how they got there.

How to Build UTM Links

  1. Go to Google's Campaign URL Builder (search for it — it's free).
  2. Enter your destination URL.
  3. Fill in the source, medium, and campaign fields.
  4. Copy the generated URL.
  5. Optionally, run it through a URL shortener to make it shareable.

Best Practices for UTM Tagging

  • Be consistent with naming. Decide on a naming convention and stick to it. "Email" and "email" will appear as two separate sources in your reports.
  • Use lowercase only. Analytics tools are case-sensitive.
  • Don't tag internal links. Adding UTM parameters to links within your own website will corrupt your session data.
  • Document your parameters. Keep a shared spreadsheet so your whole team uses the same conventions.
  • Shorten the final URL. UTM-tagged URLs are long. Use a URL shortener before posting them publicly.

Where to See Your UTM Data

In Google Analytics 4, navigate to Reports → Acquisition → Traffic Acquisition. You'll see sessions broken down by source/medium. You can also create custom reports to filter by campaign name or specific UTM content values.

Why This Matters

UTM tracking is how marketers prove ROI. When you can see that your Tuesday email drove more conversions than your paid social campaign, you can allocate budget accordingly. It turns guesswork into data-driven decisions — and it costs nothing to implement.