LinkCleanhttps://example.com/launch?utm_source=newsletter&utm_medium=email&utm_campaign=spring&utm_id=8421
After LinkCleanhttps://example.com/launch
utm_id
UTM campaign tags · Google Analytics 4 (GA4) · introduced ~2020
What is utm_id?
Universal Analytics → GA4 transition
Google Analytics 4 (rolled out 2020–2023 as a Universal Analytics replacement) added utm_id as a way to bind a click to a campaign entity inside GA4 without depending on the free-form utm_campaign string. utm_campaign=“spring-launch” is human-readable but easily duplicated; utm_id=8421 is a stable numeric ID that GA4 generates and tracks against its internal campaign table.
Both are added together: utm_campaign=spring-launch&utm_id=8421 is the common pattern in GA4-driven campaigns. Older Universal Analytics campaigns rarely had utm_id; you'll see it most on links generated by GA4's Campaign URL Builder or by marketing tools updated for the GA4 era.
Why it's safe to strip
Like every other UTM tag, utm_id is only read by analytics scripts after the page loads — the destination server doesn't use it. Strip it and the same article, sale page, or video loads.
Forwarding utm_id mainly inflates the publisher's GA4 campaign counts. Not personally identifying, but no reason to broadcast it.
Frequently asked
Why does GA4 add utm_id when utm_campaign already exists?
Stable IDs are easier to deduplicate. utm_campaign is a free-form string the publisher types; utm_id is a numeric reference to a campaign object inside GA4. Duplicates and typos in utm_campaign get folded into the right bucket via utm_id.
Does utm_id ever appear on its own (without utm_campaign)?
Occasionally — when a publisher copies a GA4 Campaign Builder URL but trims the human-readable tags. Stripping utm_id alone doesn't break anything; the destination still routes on the path.
Is utm_id personal data?
No. It's a campaign-row identifier on the publisher's GA4 side — names the campaign, not the visitor.
Clean tracking on iPhone, in one tap.
LinkClean strips ~80 vendor-specific tracking parameters from any link, from any app's share sheet — and preserves functional ones like hl, t (YouTube timestamp), and q (search). No account, on-device.
