UTM Builder

The UTM Builder turns a plain landing page URL into a tagged campaign URL. You enter the destination, fill in utm_source, utm_medium and utm_campaign (plus utm_term, utm_content and utm_id when you need them), and the tool assembles a correctly encoded query string you can paste into an email, an ad, a social post, or a QR code. UTM parameters are ignored by your web server and read by analytics tools, so the page renders exactly as before - only the attribution changes.

Getting the tags right matters more than most people expect. Google Analytics 4 treats values as case-sensitive, so Email and email become two separate mediums in your reports, and a medium GA4 does not recognise - utm_medium=facebook is the classic one - sends the whole campaign into the Unassigned bucket where it is effectively invisible. This tool normalises capitalisation and spaces, then shows you the GA4 default channel group your combination will most likely land in before you ever ship the link.

Everything runs in your browser. The URL, the parameters and the generated links never leave your device, which matters because campaign URLs routinely contain unreleased product names, partner names and pricing pages. Batch mode builds one link per source in a single pass, and the CSV export drops straight into a campaign tracking sheet.

UTM values are case sensitive everywhere it counts, and that is the single biggest cause of messy campaign reports. Google, google and GOOGLE arrive as three separate sources and split one campaign across three rows, so pick lower case and hold to it. Two more worth knowing. If Google Ads auto-tagging is enabled, its gclid parameter already carries the attribution and manual UTM tags on the same links can override it, producing figures that disagree with the Ads console. And UTM parameters are for external traffic only: tagging internal links restarts the session attribution and credits your own site as the source, which is how a campaign ends up attributed to itself. The channel prediction here shows how GA4 will group each combination before you commit to it.