Auto-tagging is a feature that you need to turn on before you can do the following:
- Track conversions on your website on all browsers
- Import conversion data into Google Ads from Google Analytics, as well as other external sources, such as your Customer Relationship Management (CRM) system
- Import Google Ads campaign and cost data into Google Analytics reports
- Import Google Analytics site engagement metrics, such as bounce rate and average session duration, into Google Ads reporting
This article explains how auto-tagging works and how to enable it.
Why use it
Auto-tagging is a required feature, which when used with Google Ads conversion tracking or Google Analytics, allows you to see how effectively your ad clicks lead to valuable customer activity, such as website purchases, phone calls, app downloads, newsletter sign-ups, and more. Depending on the type of conversion you’re tracking, the setup process is different, so the first step in setting up conversion tracking is choosing a conversion source, or where your conversions come from.
Auto-tagging is also required for businesses that want to track offline conversions, such as sales that happened at your physical shop because of your online advertising.
How it works
After someone clicks your ad, auto-tagging adds a bit of additional information – a parameter called GCLID, or 'Google Click Identifier' – to the URLs people click through. For example, if someone clicks on your ad for
www.example.com, the final URL will look like
www.example.com/?gclid=123xyz. If you have auto-tagging enabled and have a Google Analytics tag on your website, the GCLID is stored in a new Google Analytics cookie on your site’s domain (learn more about how Google Ads tracks website conversions).
Sometimes, the GCLID is created at the time of an impression, rather than a click. In those cases, if a user clicks the same ad again, the same GCLID will be used. In the click performance report, multiple clicks on the same ad by the same user are counted as multiple clicks in the same GCLID row.
A small percentage of websites don't allow arbitrary URL parameters and serve an error page when auto-tagging is turned on. Check with your web developer to see if this applies to you, or turn on auto-tagging and do a test by clicking on your ad. If the link to your site works, then you can use auto-tagging. If you get an error, you'll need to turn auto-tagging off from your Google Ads account. Then, ask your web developer to allow arbitrary URL parameters before turning it back on.
If your website uses redirects, it’s also important to make sure that the GCLID is passed to the final landing page in order to track conversions.
Set up auto-tagging
Auto-tagging is turned off by default. To turn it on, follow the steps below. If you’re unable to use auto-tagging, you can use manual tagging to import Google Ads data in Google Analytics.
- Sign into your Google Ads account.
- In the left page menu, click Settings.
- Click Account settings.
- Click the Auto-tagging section.
- To enable auto-tagging, click to check the box next to “Tag the URL that people click through from my ad.”
- Click Save.