UTM builder with ad platform templates

UTM tags are parameters in a link’s URL that tell analytics tools where a visitor came from. The name comes from the Urchin Tracking Module — Urchin was the company Google bought and turned into Google Analytics. Today Google Analytics 4, most other analytics tools and most CRMs understand them.

Without tags, a click from a newsletter often looks like “direct” traffic, and a LinkedIn post looks like a referral with no campaign name. With tags you see which campaign, ad or post brought users who signed up and reached the key action.

The five standard parameters

• utm_source — the source: a specific platform or site (google, bing, facebook, linkedin, newsletter). Required.
• utm_medium — the medium, the traffic type: cpc for pay-per-click, email, social, display, offline. Required.
• utm_campaign — the campaign name or ID: a promotion, launch or newsletter. Required.
• utm_content — the ad variant, creative or link position in an email. Helps compare ads within a campaign.
• utm_term — the keyword or audience. In search ads it is usually filled dynamically.

Parameter order does not matter. Tags go in the query string — after ? and before #: under the URI standard (RFC 3986) the fragment always comes last and is not sent to the server. If the URL already has parameters, tags are appended with &.

Google Analytics 4 stores tags as session attributes: utm_source → “Session source”, utm_medium → “Session medium”, utm_campaign → “Session campaign”, utm_content → ad content, utm_term → keyword. From the source/medium pair GA4 derives the default channel group by its own rules: medium = email goes to Email, medium = cpc with a search engine source goes to Paid Search, a social source with a “paid…” medium goes to Paid Social, social goes to Organic Social. Non-standard values such as “offline” end up in Unassigned, so agree on a medium vocabulary up front. For printed codes at events, on flyers and business cards, the UTM QR code generator tags every placement at once with one convention.

Naming rules

• Lowercase only. GA4 is case-sensitive: “LinkedIn”, “linkedin” and “LINKEDIN” are three rows in a report.
• No spaces or special characters. A space becomes %20 or +. Use “_” or “-”.
• One vocabulary for the team. Keep a shared sheet of allowed utm_source and utm_medium values (cpc, email, social, referral) and a campaign naming pattern: 2026-10_webinar_onboarding.
• No personal data. Never put an email, phone number or name in tags: URLs end up in logs, analytics and other sites’ referral reports.

In ad accounts one link serves hundreds of ads, so instead of fixed values it contains macros that the platform replaces on click with the campaign ID, ad ID or keyword. The builder does not encode macro braces, or the platform would not recognize them.

Google Ads (ValueTrack)

Microsoft Advertising

Meta ads

Click IDs — gclid, msclkid, fbclid — are never added by hand: the platforms append them. Newsletters, organic posts and offline media have no macros — write values by hand and make a separate link for each ad or email.

• UTM tags on internal links. A homepage banner tagged utm_source=site starts a new session with a new source, so a sign-up that came from Google Ads is credited to “site”. Use events for internal navigation.
• Inconsistent case and synonyms. “fb”, “Facebook” and “facebook.com” split one source into three. A vocabulary and lowercase values fix it.
• Tags after the fragment. /page#form?utm_source=google — parameters after # are not part of the query string and are not read as UTM. The builder always puts them before #.
• A hard-coded gclid or fbclid. These identify one specific click: copied into a link, they attribute all visits to that click.
• Tags on links that redirect. If the site redirects http to https or the bare domain to www and drops the query string, the tags are lost. Check the final URL in a browser.
• Links that are too long. HTTP (RFC 9110) sets no URI length limit and recommends supporting at least 8,000 characters, but email clients, messengers and URL shorteners can be stricter. Keep links under 2,000 characters.

Tags tell you where a user came from. What they do next — whether they reach the key action — is the activation funnel. To turn an activation lift into money, use the activation revenue calculator.

1. Google Analytics Help: [GA4] Collect campaign data with custom URLs; [GA4] Default channel group — support.google.com/analytics.
2. Google Ads Help: Set up tracking with ValueTrack parameters — support.google.com/google-ads.
3. Microsoft Advertising Help: What tracking or URL parameters can I use? — help.ads.microsoft.com.
4. Meta Business Help Center: About URL parameters — facebook.com/business/help.
5. RFC 3986. Uniform Resource Identifier (URI): Generic Syntax — URL component order and percent-encoding.
6. RFC 9110. HTTP Semantics, §4.1 — URI length recommendations.