- Definition
- A click identifier is a parameter such as gclid that an ad platform adds to a landing page URL to connect a visit with the ad click.
Google's auto-tagging adds the Google Click Identifier to the URL when someone clicks an ad. Other platforms use their own identifiers, such as msclkid for Microsoft Advertising.
An identifier in a captured URL shows how the destination was tagged; it does not identify a person.
How Ads Lighthouse observes it
When a destination URL contains click identifiers, the ad details view lists them separately from UTM values and other parameters.
Official sources
Sources checked on .