UTM Builder client-side

No tracking, no server calls. Builds URLs using URL + URLSearchParams.

1) Single URL

Base URL

utm_source

utm_medium

utm_campaign

utm_term

utm_content

Extra params (k=v&k2=v2)

Result

2) Bulk URLs

Input URLs (one per line)

Use the same UTM values as above

Bulk mode appends/overwrites: utm_source, utm_medium, utm_campaign, utm_term, utm_content, plus any “extra params”.

Blank lines are ignored. Invalid URLs are returned as #ERROR.

Bulk result

Tip: keep campaigns consistent. If you need enforced naming rules, add them to your own internal playbook (or pay for a stricter “campaign linter” export).