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UTM Builder

utm-builder adds UTM parameters to links the same way every time — lowercase, no spaces, existing query and #fragment preserved — and checks already tagged links for the mistakes that split or lose traffic in Google Analytics 4: missing utm_source/utm_medium/utm_campaign, UTM_Source with capitals, duplicated keys, spaces, parameters hidden after # and mediums that GA4 cannot map to a channel.

• Getting started — install, first run, reading the output
• FAQ — common questions
• Troubleshooting — errors and how to fix them

Prefer a browser? The same check runs online at PromoPilot — free, no sign-up.