UTM parameters

What UTM parameters are for

UTM parameters are additions to a link that record which source a visit came from. They are appended to the address and read by analytics tools. Without them many visits appear as direct traffic, and the question of which channel works cannot be answered.

The method is old and simple but still matters, because it is the only voluntary statement about origin that you control yourself. Ad networks evaluate their own traffic with a strong bias in their favour. Your own parameters are the neutral cross check.

The five parts

• Source: Where the visit comes from, such as the name of the network.
• Medium: The type of channel, such as paid ad, email or social post.
• Campaign: The campaign or activity, under the name used in the calendar.
• Content: Variant of the ad or link, such as creative A against creative B.
• Term: The search term in paid search, meaning the match between keyword and ad.

The first three are mandatory, the last two are aids. Anyone maintaining all five can report later without rework. Anyone maintaining only the source cannot separate channel from campaign and ends up reporting by network instead of by activity.

Why convention beats precision

The most common mistake is not a missing value but inconsistent spelling. If one team member writes the source in capitals and another in lowercase, two rows appear in every report and both look weak. The same applies to separators, special characters and the question of whether a channel counts as medium or source.

The solution is a short fixed convention, documented in one place and reachable for everyone. Six to ten allowed values per field work well, lowercase, hyphens instead of spaces and consistent names for recurring activities. Without that list you end up after a year with a report of hundreds of rows and no reliable conclusion. A link builder that blocks free text entry is the most effective measure.

What to watch legally and technically

UTM parameters themselves contain no personal data and are therefore unproblematic under data protection law. It becomes a problem when customer or order numbers are placed in the fields, because they then land in analytics tools and referrer logs. Anyone needing individualised links should use a dedicated field and strip it before analysis.

Technically, parameters can be lost during redirects. If a link first goes to a shortener and then through an intermediate step, the parameters can disappear and the visit appears without a source. Before any larger activity, a short test belongs in the routine: click the link and check in the analytics tool whether the attribution arrives. Three clicks save a week of confusion.