UTM link builder, with naming rules and QR codes

What UTM parameters are

UTM stands for “Urchin Tracking Module”, a name inherited from the analytics service Google acquired and turned into Google Analytics. In practice they are tags added to the end of a URL, after the ?, that tell Google Analytics where a visitor came from: the source (utm_source: google, newsletter, facebook), the medium (utm_medium: cpc, email, social), the campaign (utm_campaign) and, optionally, utm_term (the keyword), utm_content (the ad variant or link position) and utm_id (the campaign ID). Without them, a click from a newsletter or a social ad can end up in your reports as generic “direct” or “referral” traffic.

How they show up in GA4

In Google Analytics 4 the values appear in the acquisition reports (for example Reports → Acquisition → Traffic acquisition) as session source / medium and session campaign. The medium (together with the source) largely decides which default channel group a session lands in. As a rough guide, cpc or ppc with a search source gives Paid Search, paid_social with a social network gives Paid Social, email gives Email, referral gives Referral and social gives Organic Social. A medium like “offline” or “ad1” usually falls into Unassigned. This is a simplification: Google defines the exact rules in its documentation of default channel groups and may change them, and a custom channel group in your own account can behave differently, so check them under Admin. Data only shows up if the landing page has the GA4 tag installed, and data already collected is not corrected retroactively.

A recommended naming convention

The value of a parameter matters less than consistency. Pick a simple rule and have the whole team stick to it: lowercase, no spaces or accents, with _ or - as the separator.

Common mistakes

• Inconsistent capitalization. “Facebook” and “facebook” can show up as two different sources in your reports.
• UTM on internal links. The parameters can overwrite the real source of the visit and break attribution. For buttons and banners on your own site, use GA4 events.
• An invented medium. If you do not follow the standard values, traffic may land in Unassigned.
• One link in many places. If the same link is pasted into five channels, you can no longer tell which one drove the clicks. Use one link per channel or placement.
• Changing a link after it is published. Document every link in a shared sheet or in the tool’s history.

UTM and SEO

UTM parameters are not a ranking factor, but they can create duplicate URLs if the links become indexable. Keep a rel="canonical" tag pointing to the clean version of the page, keep UTM URLs out of your sitemap, and never use them in your site’s navigation or internal links. You do not need UTM for organic traffic: you see it in Google Search Console and in GA4. If you publish advertorials, a UTM on the link to your site measures the traffic the article brings in without changing the landing page.

Personal data and GDPR

A URL ends up in server logs, browser history and Analytics. That is why parameters must not contain personal data: names, email addresses, phone numbers or IDs that identify a person. The Google Analytics terms prohibit sending personally identifiable information. In email campaigns use general values (utm_content=top_button), never the recipient’s address. The tool warns you when a value looks like an email or a phone number.

Why a QR code needs its own UTM

A QR code on a poster, flyer or package points to an ordinary address, and the visits show up in Analytics as direct traffic. A link with its own UTM for each material (qr / offline, campaign, placement) shows you how many scans each one brought. Quiet zone, contrast and size are checked in the “QR code” tab.

Where to go next

Consistent links are the basis of a useful monthly report; see which KPIs to track and how to build the report. For marking up your landing pages, use the schema generator, and if you want a full acquisition strategy, we can work on it in SEO consulting.