Google Ads & GA4 Integration · Linking, Audiences & Data

Google Ads and GA4 serve complementary measurement roles. Google Ads excels at ad performance measurement — click, impression, and conversion data attributed to specific keywords and ads. GA4 excels at post-click behaviour measurement — what users do after clicking, session quality, engagement depth, and path analysis.

The integration enables: GA4 conversion events (including complex multi-step conversions impossible to track with a simple thank-you page tag) to be imported into Google Ads for Smart Bidding; GA4 audiences (built with GA4's powerful segmentation) to be shared with Google Ads for targeting; Google Ads click data to appear in GA4 for full funnel analysis.

The link can be established from either Google Ads or GA4:

From Google Ads

1. Tools and Settings → Linked Accounts → Google Analytics
2. Find your GA4 property → Link
3. Enable auto-tagging (required for data passing) if not already enabled
4. Enable personal data import (required for audience sharing)

From GA4

1. Admin → Product Links → Google Ads Links → Link
2. Select your Google Ads account(s)
3. Enable auto-tagging and personal data options

One GA4 property can be linked to multiple Google Ads accounts (for agency management). One Google Ads account can be linked to multiple GA4 properties.

Auto-tagging automatically appends a gclid (Google Click ID) parameter to every URL clicked from a Google Ad. GA4 reads this parameter and associates the session with the originating keyword, match type, campaign, and ad group — without you manually setting UTM parameters.

Manual UTM parameters (utm_source, utm_medium, utm_campaign, utm_term, utm_content) are the standard way to pass campaign data to analytics tools. For Google Ads specifically, auto-tagging passes more granular data than UTMs can provide — including keyword match type, ad group, network, and device.

When to use UTMs with Google Ads

• Third-party analytics platforms (Mixpanel, Amplitude) that do not read gclid — require UTMs for campaign attribution
• When you need consistent campaign tracking across Google Ads and non-Google channels
• When the destination URL includes a landing page builder or redirect that strips URL parameters

If using both auto-tagging and UTMs, GA4 prioritises auto-tagging data when both are present — UTMs are used as a fallback. This is the correct configuration for most setups.

After linking, GA4 conversion events can be imported into Google Ads and used for Smart Bidding. The advantage over direct Google Ads tag implementation: GA4 can track complex conversion events involving multiple steps, custom parameters, or events that a simple thank-you page tag cannot capture.

Import process

1. Ensure the GA4 conversion event is correctly firing and verified in GA4
2. In Google Ads: Goals → Conversions → New Conversion Action → Import → Google Analytics 4 Properties
3. Select the GA4 conversion event to import
4. Configure attribution model (Data-Driven recommended), conversion window, and whether to include in Smart Bidding optimisation

Avoiding double-counting

If you have both a direct Google Ads conversion tag AND an imported GA4 conversion for the same action, you will count every conversion twice — inflating your reported conversion numbers and sending incorrect signals to Smart Bidding. Use one or the other for each conversion type, not both. Google Ads recommends marking one as "Primary" (included in Smart Bidding) and the other as "Secondary" (reporting only) if you need both for comparison purposes.

GA4's audience builder supports complex audience definitions that the Google Ads remarketing tag cannot match — event sequences (viewed product, then added to cart, but did not purchase), user properties (logged-in users, specific customer segments), and multi-session behavioural patterns.

Setting up GA4 audience sharing

1. In GA4: Configure → Audiences → Create Audience
2. Build the audience using GA4's condition builder (events, parameters, user properties, sequences)
3. Under Destinations, enable "Google Ads" — the audience will automatically appear in your linked Google Ads account's Audience Manager
4. In Google Ads, go to Tools → Audience Manager → Your Data Segments — GA4 audiences appear here and can be used in any campaign

GA4 audiences require a population period (typically 1–7 days) before they are available in Google Ads. Audience size must reach the minimum threshold (100 users for Display; 1,000 for Search RLSA) before the audience can actively serve ads.

After linking, several GA4 metrics become available directly in the Google Ads interface alongside click and conversion data:

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