GCLID Data in Google Analytics 4: Enriching You Reports for Free

Google Analytics 4 (GA4) is the latest version of Google’s web analytics platform that offers new features and capabilities for measuring and optimizing website performance. One of the benefits of GA4 is that it can automatically import data from your linked Google Ads account, such as keywords, costs, and conversions. This allows you to see how your Google Ads campaigns are driving traffic and conversions to your website.

However, to enable this feature, you need to tag your Google Ads final URLs with a parameter called gclid, which stands for Google Click Identifier.

In this article, we will explain how to add gclid data to Google Analytics 4 in two ways: by enabling auto-tagging in Google Ads or by manually tagging your final URLs with tracking variables. We will also discuss the benefits of passing gclid data to GA4 and some common issues and solutions related to gclid tracking.

What is GCLID?

The gclid is a unique string of characters that is added to your landing page URL when a user clicks on your ad served by Google Ads. For example, if your landing page URL is www.example.com, it will appear as www.example.com/?gclid=123xyz when a user clicks on your ad.

The gclid parameter helps Google Analytics 4 identify which ad and keyword triggered the click and to attribute the subsequent actions on your website to that click. This way, you can get more detailed and accurate data about your Google Ads performance in GA4.

Many platforms use their own click identifying values – Facebook has fbclid, Microsoft Advertising has msclkid. Voluum, a performance ad tracker, uses its own click ID to reliably identify users across different platforms and to enable marketers’ optimization options on a massive scale. More on Voluum later.

Benefits of Passing GCLID Data to Google Analytics 4

Passing gclid data to Google Analytics 4 has several advantages for measuring and optimizing website performance. First and foremost, it allows you to clearly identify traffic that comes from Google Ads. Additional benefits allow you to look into your data with more detail.

  • You can see which keywords, ads, ad groups, campaigns, and networks are driving the most traffic and conversions on your website. This can help you optimize your bidding, targeting, and messaging strategies for your Google Ads campaigns.
  • You can use enhanced measurement features in GA4, such as scroll tracking, outbound link clicks, video engagement, file downloads, and site search. These features can help you understand how users interact with your website content and what actions they take after clicking on your ads.
  • You can create custom audiences in GA4 based on the behavior of users who clicked on your ads. For example, you can create an audience of users who clicked on a specific keyword or ad group and then visited a certain page or completed a certain goal on your website. You can then use these audiences for remarketing or personalization purposes in Google Ads or other platforms.
  • You can use conversion modeling in GA4, which uses machine learning to estimate conversions that are not directly observed due to factors such as browser blocking or cross-device behavior. Conversion modeling can help you get a more complete picture of your return on ad spend (ROAS) and optimize your campaigns accordingly.

How Does It Work?

Including gclid data in your Google Analytics report is a multistep process. First, you need to make sure that this data is appended to your URL. You can do this by enabling auto-tagging or using a URL builder to set up necessary parameters.

Second, you need to configure Google Analytics 4 to recognize gclid data by creating a custom dimension for it.

Third, you need to capture the gclid value with Google Tag Manager or custom JavaScript function. Note that this is not required if you link your Google Ads and Google Analytics accounts and enable auto-tagging.

How to Enable Auto-Tagging in Google Ads

The easiest and recommended way to add gclid data to Google Analytics 4 is to enable auto-tagging in Google Ads. Auto-tagging automatically appends the gclid parameter to your final URLs without requiring any manual intervention. When you have auto-tagging enabled and a Google Analytics 4 tag on your website, the gclid data will be stored in a new Google Analytics cookie.

Auto-tagging also ensures that you get the most detailed and accurate data from your linked Google Ads account in GA4.

To enable auto-tagging in Google Ads, follow these steps:

  1. Sign in to your Google Ads account.
  2. Click “Settings” on the left page menu.
  3. Click “Account settings” at the top of the page.
  4. Click the “Auto-tagging” section.
  5. Check the box next to “Tag the URL that people click through from my ad”.
  6. Click “Save”.

Once you enable auto-tagging, you should see the gclid parameter in your landing page URLs when you test your ads. You should also see data from your linked Google Ads account in GA4 under Acquisition > All traffic > Source/Medium or Acquisition > Google Ads.

How to Manually Tag Your Final URLs with Tracking Variables

In some cases, you may not be able to use auto-tagging or you may want to use additional tracking variables besides gclid. For example, you may have a website that does not allow arbitrary URL parameters or you may want to track other parameters such as campaign name or ad content.

In these cases, you can manually tag your final URLs with tracking variables using the Google Analytics Campaign URL Builder tool. This tool helps you generate URLs with custom parameters that can be recognized by GA4. These parameters are called UTM parameters, and you can manually set your campaigns to pass gclid and other data:

How to Set Up Google Analytics 4 to Get GCLID Data?

The last thing to do when setting up passing gclid data to Google Analytics 4 is to create a custom dimension. Custom dimensions allow users to define and receive very detailed layers of data. For example, marketers may distinguish between clicking between specific links rather than just registering a general page click event.

If you create a custom dimension for gclid data, you will be able to view Google Ads as a source in your reports.

To create a custom dimension, follow these steps:

  1. Sign in to your Google Analytics account.
  2. Go to Admin settings.
  3. Go to Custom definitions and click “Create custom dimension“.
  4. Name the new custom dimension “gclid“.
  5. For scope, select “User“.
  6. Save your changes.

How to Set Up Google Tag Manager to Capture GCLID Value

You can use Google Tag Manager, a service that allows you to manage all your tracking and analytical scripts in one place, to capture gclid value.

To create a custom variable, follow these steps:

  1. Open your GTM container.
  2. In the Variables section, add a new User-Defined variable.
  3. For Variable Type, select “URL“.
  4. For Component Type, select “Query“.
  5. For Query Key, type in “gclid“.
  6. Leave all other settings as they are and save the variable.

To set up a tag, follow these steps:

If you already use GTM to put Google Analytics on your website, go to your existing tag. Otherwise, create a new tag for Universal Analytics.

  1. In the tag configuration, open the dropdown for Google Analytics Settings and create a new variable.
  2. Add a Custom Dimension under ‘More Settings’.
  3. For Dimension Value, click on the brick icon to open your available list of variables. Select the variable you created previously.

Voluum Click ID is Designed for Multi-Platform Tracking

As hinted before, all ad networks or analytical services use their own proprietary click IDs to manage what is going on and correctly attribute (connect) events in a logical order.

Voluum, a performance ad tracker, has been built with the idea of exchanging click IDs between various platforms: ad networks, your own landing pages, and offers that are sometimes sourced from third-party platforms such as affiliate networks. Voluum can receive click IDs from all traffic sources, pass its own click ID to these affiliate networks and, once a conversion occurs, reverse the whole process to record a conversion and pass information about it to the traffic source.

To achieve this, Voluum uses either scripts that store click IDs in a cookie or an HTTP request that needs little setup to allow communication between various parts of your campaign funnel.

While gclid data only identifies traffic coming from a single source – Google Ads – the Voluum click ID is great for connecting traffic coming from various sources with offers that are your own or supplied by an affiliate network. While Voluum does not allow for in-depth analysis of single link clicks like Google Analytics does, it is great for large-scale testing and optimization efforts.

For certain use cases, Voluum can be a great replacement for Google Analytics 4 or work as an addendum to what GA4 has to offer.

Make sure to check out Voluum for free!

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