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Welcome to the help center for DoubleClick Search, a platform for managing search marketing campaigns.  While the help center is available to the public, access to the DoubleClick Search product is available only to subscribing customers who are signed in. To subscribe or find out more, contact our sales team.

About click IDs

To track specific clicks an ad, AdWords or DoubleClick Search (DS) can generate a case-sensitive ID. Generating a click ID is required for some links between Google products (such as DS and Google Analytics), and you can use the ID to attribute offline conversions to specific site visits.

Generating a click ID

If you enable auto-tagging in AdWords, AdWords generates a click ID when your ad is shown. As a result, if a user clicks on a particular ad impression multiple times, those clicks will be associated with only one GCLID. Landing page visits for the exact same impression will share the same click ID. 

DS can generate a click ID if you enable Google Analytics support or enable the conversion API service. If a click is redirected from AdWords and AdWords has already generated a click ID, DS uses the AdWords ID instead of generating a new one. If a click is redirected from another type of supported engine, DS generates the ID.

Sending the click ID to your site

Regardless of which system generates a click ID, DS appends two URL parameters to landing page URLs before redirecting to your site: 

  • gclid: contains the click ID

  • gclsrc: indicates which system, DS or AdWords, generated the click ID.

    Only DS generates and appends the gclsrc parameter. (You won't see this parameter in AdWords accounts that are not  managed by DS.) The value of the gclsrc parameter will be one of the following:

    • gclsrc=ds: the click ID was generated by DS. In addition, the click was either on an engine other than Google, or the click was on Google but the AdWords account is not using auto-tagging.

    • gclsrc=aw.ds: the click ID was generated by an AdWords account that is using auto-tagging.

    • gclsrc=: the parameter is empty if the click ID was generated by AdWords, but neither Google Analytics support nor the conversion API service are enabled in DS.

gclid and gclsrc are reserved parameter names: DS uses them and does not de-duplicate if you also use them.

If you want the click ID and click source to be available in additional parameters with names other than gclid and gclsrc, use the [*GCLID*] and [*GCLSRC*] macros. 

Testing click IDs from AdWords

If you test your tracking template in AdWords, the best practice is to click on a live ad that has been served in Google search results. If you click the Test button in AdWords, there is no guarantee that the landing page URL will have a click ID.

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