UTM builder for links GA4 reports correctly

UTM parameters tell your analytics where a visit came from. Without them, a click from your newsletter opened in a desktop email app often shows up as direct traffic, and a link shared in a chat app can arrive with no referrer at all. Five minutes of consistent tagging makes every campaign report trustworthy.

The parameters

• utm_source: where the click comes from, such as newsletter, google or linkedin. Required.
• utm_medium: the type of traffic, such as email, cpc or social. Required, and it decides most of GA4's channel rules.
• utm_campaign: the launch, promotion or email, such as spring_launch. Google's builder asks for a campaign name or a utm_id.
• utm_term: the paid keyword or audience.
• utm_content: tells apart links in the same campaign, such as header_button and footer_link.
• utm_id: a campaign ID, used when you import cost data into GA4.
• utm_source_platform, utm_creative_format, utm_marketing_tactic: extra detail for ad buyers. GA4 reports the source platform, but not currently the creative format or marketing tactic.

How GA4 turns UTMs into channels

GA4 sorts every session into a default channel group by checking rules in a fixed order. The first rule that matches wins, which is why the order matters: social and search sources are checked before email, so a link with utm_source=linkedin&utm_medium=email is reported as Organic Social, not Email. Campaign names are checked first of all: a campaign containing "shop" or "shopping" is treated as a shopping campaign, and one containing "cross-network" is reported as Cross-network.

Some sources are enough on their own. With a medium that isn't paid or display, such as newsletter, source google or bing lands in Organic Search, facebook or linkedin in Organic Social, and youtube in Organic Video. Without a known source, mediums like newsletter, qr, print or partner match nothing and land in Unassigned.

A naming convention that holds up

1. Lowercase everything. GA4 values are case-sensitive, so Email and email become two rows.
2. No spaces. Use underscores or hyphens and stick to one.
3. Stick to standard mediums (email, cpc, paid_social, social, referral, affiliate) so every link lands in a real channel.
4. Put detail in campaign and content, not in the medium: utm_medium=email&utm_campaign=trial_day_3 rather than utm_medium=trial_email.
5. Write it down. A shared list of allowed sources and mediums stops the next person from inventing E-mail.

Common mistakes

• Tagging internal links. A UTM on a link inside your own site replaces the visitor's real source with your internal tag, so the campaign that brought them in loses the credit.
• Personal data in URLs. Never put an email address or name in a UTM value. Google Analytics forbids it, and URLs end up in server logs.
• UTMs after the #. Parameters placed after a #fragment aren't part of the query string, so GA4 doesn't read them as UTMs. This builder always puts them before the fragment.
• Duplicated parameters. Pasting a new tag onto an already-tagged link leaves two utm_source values. The builder replaces the old one.
• Manual UTMs on Google Ads. With auto-tagging on, GA4 prefers the gclid for Google Ads clicks, so manual UTMs there usually aren't needed.

Once your links are tagged, turn a link into a scannable code with the QR code generator, or shorten it and count clicks with the Atlis link tracker.