UTM Link Builder

A UTM link builder adds utm_source, utm_medium, utm_campaign, utm_term and utm_content to a URL so analytics can attribute visits to campaigns. Consistent lowercase naming keeps reports clean.

It runs entirely in your browser. Nothing you paste or upload is sent to a server or stored.

How to read the result and act on it

The output is your original URL with the campaign parameters added after a question mark. Check that the base URL is correct, then confirm the source, medium and campaign values are spelled the way your team agreed. In Google Analytics 4 these appear in the traffic acquisition reports as session source, medium and campaign. Use the link in the channel it describes, such as an email newsletter or paid social ad, and test it by clicking and confirming the visit appears in real-time reports. Store the finished links in a shared sheet so everyone uses the same naming.

Common mistakes to avoid

Inconsistent naming is the biggest problem. Facebook, facebook and fb will show as three separate sources, so pick lowercase names and stick to them. Another mistake is using UTM parameters on internal links, which can overwrite the original source and break attribution. Avoid putting personal data such as email addresses in any parameter, since URLs get logged and shared. Do not tag organic search links, because Google Analytics already detects them. Also avoid spaces and special characters, and keep campaign names short and descriptive.

Which UTM parameters are required?

Source and medium are essential for GA4 attribution; campaign is strongly recommended.

Should I use UTMs on internal links?

No. They overwrite the original source of the session.

What is the difference between utm_source and utm_medium?

utm_source names where traffic comes from, such as a newsletter or a site. utm_medium names the channel type, such as email, social or cpc. Together they group visits in your analytics reports.

Do UTM parameters affect SEO?

UTM links can create duplicate URLs, so use canonical tags pointing to the clean URL. Search engines usually handle them well, but you should avoid linking to tagged URLs within your own site.

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