Shopify Google Ads Conversion Tracking with GTM and Enhanced Conversions

Two ways to get Shopify sales into Google Ads

This guide covers the native tag route, which most Shopify advertisers use because it gives the cleanest control over value, order ID and Enhanced Conversions.

Step 1: Create the conversion action in Google Ads

1. In Google Ads go to Goals → Conversions → New conversion action → Website.
2. Choose Purchase as the category and set the value to Use different values for each conversion (you will pass the real order value).
3. Set the count to Every conversion, since a customer can buy more than once.
4. Choose to set up manually with Google Tag Manager and copy the Conversion ID and Conversion Label.

Step 2: Add the tags in Google Tag Manager

1. Conversion Linker tag, trigger All Pages. It stores the Google click ID (gclid) in a first-party cookie so a later purchase can be attributed to the ad click.
2. Google Ads Conversion Tracking tag, trigger Custom Event `purchase`.
3. In that tag, set Conversion ID and Conversion Label from step 1.
4. Set Conversion Value to a Data Layer Variable for ecommerce.value, Currency Code to ecommerce.currency, and Order ID to ecommerce.transaction_id.

These variables come straight from the purchase event your Customer Events pixel pushes. If that event is missing or malformed, nothing downstream will work, so confirm it first with the GA4 ecommerce guide and the Customer Events guide.

Why the Order ID matters

Google Ads uses the Order ID to de-duplicate conversions. Shopify's checkout_completed event can fire again if a customer reloads the thank-you page, and without a unique order ID that reload becomes a second sale in your reports. Always send the Shopify order ID as transaction_id and map it to the Order ID field.

Step 3: Turn on Enhanced Conversions

Enhanced Conversions lets you send first-party customer data, such as email, phone and address, alongside the conversion. The data is hashed with SHA-256 before it leaves the browser, and Google matches it against signed-in Google accounts to recover conversions that cookies alone would miss. That improves measurement and gives Smart Bidding more signal.

1. In Google Ads: Goals → Settings → Enhanced conversions for web and turn it on, accepting the customer data terms. Choose Google Tag Manager as the method.
2. In your Shopify pixel, include the customer's email, phone and address from checkout_completed in a user_data object pushed with the purchase event.
3. In GTM, create a User-Provided Data variable that reads those fields from the data layer.
4. In the Google Ads Conversion Tracking tag, tick Include user-provided data from your website and select that variable.
5. Check Goals → Diagnostics in Google Ads for Enhanced Conversions status after a few days of traffic.

Remarketing and dynamic remarketing

If you run remarketing, your view_item, add_to_cart and purchase events need an items array whose item_id values match your Merchant Center feed. Mismatched IDs are the most common reason dynamic remarketing audiences stay empty. See the rules section of the data layer guide.

Step 4: Verify conversions are recording

• In GTM Preview, confirm the Conversion Linker fired on landing and the Conversion Tracking tag fired exactly once on purchase, with the correct value and order ID.
• In Google Ads open Goals → Conversions and check the status. A new action usually moves from “No recent conversions” to “Recording conversions” after a real conversion arrives.
• Place a real or test order after clicking one of your own ads, then allow time for reporting. Conversions can take hours to appear.
• Compare Google Ads conversion value to Shopify revenue from Google-attributed orders. Different attribution windows mean they will not match exactly, but they should be in the same range.

Common Google Ads tracking mistakes on Shopify

• Native tag and GA4 import both set to Primary, double counting every sale.
• No Order ID, so reloads create duplicate conversions.
• Value sent as a string like $49.00 or in a different currency than your account expects.
• Conversion Linker missing, so click IDs are lost and attribution drops.
• Old Additional Scripts or the Google & YouTube app still firing a second purchase conversion.
• Conversion firing on the wrong event, such as begin_checkout, which inflates conversion counts and teaches bidding to chase checkouts, not sales.

Prebuilt Google Ads tags for Shopify

Both Shopify DIY Tagging Packs include Google Ads conversion tracking and Enhanced Conversions, already wired to the purchase event: you paste in your Conversion ID and Label and publish. Details on what each pack includes.