UTM Campaign URL Builder

What each parameter is for

Five parameters, and most confusion comes from treating source and medium as interchangeable.

• utm_source — where the traffic came from. A specific named property: newsletter, linkedin, partner-site.
• utm_medium — the kind of channel. A category, not a name: email, cpc, social, affiliate. GA4 uses this to group traffic into channels, so inventing values here is what breaks the default channel report.
• utm_campaign — which initiative this belongs to: spring-sale-2026, product-launch.
• utm_term — the paid keyword. Rarely needed manually, since paid platforms populate it automatically.
• utm_content — which variant, for A/B testing: header-cta versus footer-cta.

A useful test: source answers "which specific place?", medium answers "what kind of place?". An email from your newsletter is source newsletter, medium email. Sticking to the standard medium values — email, cpc, social, affiliate, referral, display — is what keeps GA4's channel grouping working without custom rules.

The mistakes that wreck campaign reporting

Never tag internal links. This is the one that causes real damage. UTM parameters on a link between two pages of your own site start a new session and overwrite the original attribution, so a visitor who arrived from Google and then clicked a tagged internal banner is recorded as having come from that banner. Your acquisition data becomes fiction. For internal link testing, use GA4 events instead.

Inconsistent case fragments everything. GA4 treats Email, email and EMAIL as three separate sources. A year of casual tagging produces a report with a dozen variants of the same channel. This builder lowercases everything automatically, which is the simplest possible fix.

Spaces and inconsistent separators. A space becomes %20 or + depending on the platform, producing two versions of the same campaign. Use hyphens, always.

Never put personal data in a UTM. Parameters are visible in the URL, stored in analytics, sent in referrer headers and frequently shared when someone copies a link. An email address or customer ID in a utm_content value is a data protection problem, and it is more common than it should be.

Keeping tagging consistent over time

The technical part of UTM tagging is trivial. The part that fails is consistency across people and months.

Write down your conventions somewhere the whole team can see: the allowed medium values, the campaign naming pattern, whether dates go in campaign names, who is allowed to invent a new source. A shared spreadsheet logging every link built is unglamorous and works. Without it you get spring_sale, spring-sale, SpringSale and spring-sale-2026 all describing the same campaign, and no report can put them back together.

Two more habits worth adopting. Include the year in campaign names — you will run "spring sale" again, and you will want to compare. And check the tagged URL actually works before sending it: paste it into a browser and confirm the page loads, particularly if the destination already had query parameters, since a mishandled ? versus & produces a broken link that goes out to your entire list.

How to use the UTM Campaign URL Builder

1. Enter the destination URL

   The page you are sending people to. Existing query parameters are preserved and the separator is handled correctly.

2. Fill in source and medium

   Source is the specific place, medium is the channel type. Stick to standard medium values so GA4's channel grouping keeps working.

3. Name the campaign

   Use lowercase and hyphens, and include the year. Match whatever convention your team already uses.

4. Copy the URL, or switch to bulk mode

   Bulk mode takes a list of destinations and applies the same campaign parameters to all of them.

Frequently asked questions