Do I need UTMs on my Google Ads?

Usually not for Google Analytics. Google Ads auto-tagging adds a gclid to every click, and Analytics uses that to attribute the visit to the right campaign, ad group, and keyword automatically. You add manual UTMs when you need readable source and medium values in a tool that does not read the gclid, such as some CRMs or email platforms.

The gclid (Google Click Identifier) is a unique code Google Ads appends to your landing-page URL on each ad click when auto-tagging is on. Google Analytics and Google Ads use it to tie the click to its campaign and to import conversions. It is on by default in most Google Ads accounts.

Will manual UTMs conflict with Google auto-tagging?

They can. If you add a utm_source or utm_medium that disagrees with what auto-tagging reports, Analytics may use the manual values and your Google Ads numbers and Analytics numbers can stop matching. If you tag manually, keep the values consistent with the platform, or rely on auto-tagging alone.

Does Lead Source need UTMs to track a Google Ads lead?

No. Lead Source reads the gclid and any UTMs present at landing and holds them server-side until the visitor submits a form, so it captures the source whether you tag manually or rely on auto-tagging.

Google Ads and UTMs: do you need both?

Short answer: for Google Analytics, usually not. Google Ads already auto-tags every click with a gclid, and Analytics uses that to credit the right campaign on its own. You reach for manual UTMs when something other than Analytics needs to read the source. Here is where each one fits, and where they clash.

Glen Johnston Founder, Lead Source · 4 min read Published 21 May 2026

Auto-tagging does most of it for you

When auto-tagging is on (it is by default in most Google Ads accounts), Google appends a gclid to the landing-page URL on every ad click. The gclid is a single opaque code, not a set of readable tags, and Google Analytics uses it to attribute the visit to the exact campaign, ad group, and keyword without you adding anything. For the common case of Google Ads feeding Google Analytics, manual UTMs are redundant.

So when do you actually need UTMs?

You add manual UTMs when something that cannot read the gclid needs to know the source. The gclid is only meaningful inside Google's own products. So:

A CRM or email tool that records the landing URL but does not decode gclids will see a readable utm_source=google and utm_medium=cpc, but a bare gclid tells it nothing.
A non-Google analytics tool generally reads UTMs, not gclids.
If auto-tagging is switched off (it can be), UTMs become your only signal, and you should tag manually.

The clash to avoid: don't fight your own tags

Auto-tagging and manual UTMs can disagree. If you add a utm_source or utm_medium that contradicts what auto-tagging reports, Analytics may take the manual value, and your Google Ads figures and your Analytics figures stop reconciling. The rule of thumb: pick one. Either rely on auto-tagging for the Google-to-Analytics path, or tag manually with values that match the platform exactly. Do not half-do both.

If you do tag manually, build the links consistently with our free UTM builder so the values match every time and a stray capital letter does not split your reporting.

Either way, the lead still needs connecting

Whether you rely on the gclid or add UTMs, both live in the URL and both stop at the click. Neither follows the visitor to the form they submit or tells you whether the click became a customer. Google Ads attribution covers how to bridge that for paid search specifically; the general version is in the UTM tracking guide.