Google Ads Conversion Tracking: Setup and Testing Guide

How does Google Ads conversion tracking work?

Google Ads conversion tracking works by matching an ad click to a later action on your site. When someone clicks your ad, auto-tagging adds a click ID to the landing page URL, your Google tag saves it in a first-party cookie, and when that visitor buys or submits a form, the conversion tag sends the event back with the saved click ID.

That chain has four links, and a conversion only gets recorded if all four hold:

1. The click ID. With auto-tagging on (Admin › Account settings › Auto-tagging), Google appends a gclid parameter to your landing page URL. Some iOS traffic arrives with gbraid or wbraid instead, which are privacy-safe identifiers Google uses where a GCLID can't be passed. Our guide to GCLID, GBRAID and WBRAID explains the difference.
2. The first-party cookie. The Google tag (or GTM's Conversion Linker) reads that parameter and stores it on your own domain in cookies named _gcl_aw and _gcl_gs, plus browser local storage.
3. The conversion event. On the thank-you page, purchase event or form submission, an event tag fires with the conversion label, value and transaction ID.
4. The match. Google Ads reads the stored click ID, credits the conversion to the campaign, ad group and keyword, and feeds it to Smart Bidding.

Ad clickAuto-tagging adds gclid, gbraid or wbraid to the URL

Landing pageGoogle tag stores the click ID in the _gcl_aw cookie

ConversionEvent tag fires with label, value and transaction ID

Google AdsClick and conversion are matched and sent to Smart Bidding

One change trips up older tutorials. Google's Tag Manager documentation now states that if a container loads a Google tag on every page, it doesn't also need a Conversion Linker tag. The Google tag does the cookie work itself. You still need a separate Conversion Linker if your container fires Google Ads tags without a sitewide Google tag.

Which conversion actions should you track in Google Ads?

Track every meaningful step, but only let the actions that directly produce revenue drive bidding. In Google Ads that split is Primary (used for bidding and shown in the Conversions column) versus Secondary (observation only, shown in All conversions).

This is the single most expensive setting in most accounts we audit. If "page view of /contact" or "add to cart" is Primary, Smart Bidding learns to buy cheap, low-intent clicks that trigger those events, and your cost per conversion looks great while sales stall.

Primary (bids on it)

• Purchase with order value
• Qualified lead or closed sale imported from the CRM
• Calls from ads over your minimum duration
• Booked appointment

Secondary (watch only)

• Add to cart, begin checkout
• Raw form submission, if you import qualified leads
• Clicks on phone number or email links
• Page views, scroll depth, newsletter sign-ups

What counts as Primary depends on how you make money:

A real example: when Spacey Digital, a B2B lead-gen business, came to Logical Gecko, its conversion actions were counting low-intent form fills and page views, so automated bidding was optimizing toward noise. Rebuilding tracking first, with only qualified actions as Primary, was the foundation for the account reaching 9.09x ROAS and $653K in tracked conversion value at a $13.07 cost per conversion.

What conversion settings matter: count, windows, attribution and value?

Four settings decide what Google Ads counts as a conversion and how much it's worth. Set them deliberately when you create each action, because changes only apply going forward.

Data-driven attribution works with any volume, but Google says it performs best with at least 200 conversions and 2,000 ad interactions in 30 days. Below that, it still runs; it just has less data to learn from.

Lead-gen businesses often skip values, which leaves Smart Bidding treating a $150 repair call and a $12,000 replacement quote the same. Give each lead action a value based on what it's worth to you:

Illustrative math: if 25% of form leads become jobs and the average job earns $800 in gross profit, each form lead is worth 0.25 × $800 = $200. If 40% of qualified calls book at the same profit, a call is worth $320. Now bidding can prefer calls, and you can later move to value-based bidding once you import real sale amounts.

Google tag, Google Tag Manager or GA4 import: which setup method should you use?

For most businesses, Google Tag Manager is the best way to install Google Ads conversion tracking. It sends conversions natively to Google Ads, handles values and transaction IDs cleanly, and keeps every tag in one place. Use the direct Google tag on simple sites without GTM, and treat GA4 imports as a fallback, not the default.

Two rules apply whichever route you choose. First, pick one source of truth per action: if a purchase is tracked by the native tag, the GA4 import of that same purchase must be Secondary or removed. Second, Google Ads also offers a codeless option ("Automatically without code") that fires on a URL match. It's fine for a simple thank-you page, but it can't pass order values or transaction IDs, so stores should use code or GTM.

How do you set up Google Ads conversion tracking with Google Tag Manager?

You create the conversion action in Google Ads, copy its Conversion ID and label, then build a Google tag and a Google Ads Conversion Tracking tag in GTM, test in Preview, and publish. Here is the full sequence with current menu names, based on Google's web conversions setup guide.

1. Create the conversion action. In Google Ads, go to Goals › Conversions › Summary and click + Create conversion action (some accounts show New conversion action). Choose conversions on a website, enter your domain and click Scan.
2. Pick the category and method. Choose the category (Purchase, Submit lead form, Book appointment and so on), then + Create conversion using the Google tag and select Manually using code. Under Conversion settings, set action optimization (Primary or Secondary), value, count, windows and attribution. Click Save and continue.
3. Get the Conversion ID and label. Open the conversion action, go to the Tag setup section and choose Use Google Tag Manager. Copy the Conversion ID (the number after AW-, shared by the whole account) and the Conversion label (unique to this action). You can also click Set up in Google Tag Manager to push a suggested tag into a GTM workspace.
4. Install the Google tag sitewide. In GTM, go to Tags › New › Tag Configuration › Google tag. Enter your AW- ID as the Tag ID and use the built-in Initialization trigger that fires on all pages. This loads Google Ads on every page and stores the click ID. If you can't run a sitewide Google tag, add Tags › New › Conversion Linker with the All Pages trigger instead.
5. Build the trigger. Go to Triggers › New. For a store, use a Custom Event trigger on your purchase data layer event. For a lead form, prefer a custom event pushed on successful submission; a Page View trigger on the thank-you URL works if that page can't be reached any other way.
6. Create the conversion tag. Go to Tags › New › Tag Configuration › Google Ads › Google Ads Conversion Tracking. Paste the Conversion ID and label. For purchases, map Conversion Value, Transaction ID and Currency Code (for example USD) to data layer variables. If the value field is empty, GTM sends 0. Attach your trigger and save.
7. Test in Preview. Click Preview, enter your site URL, complete a real test conversion and confirm the conversion tag fired once, on the right event, with the right value.
8. Publish. Click Submit, name the version (for example "Google Ads purchase conversion") and Publish.

How do you set up enhanced conversions in Google Ads?

Enhanced conversions sends a hashed copy of first-party data, such as email and phone, with your conversion so Google can match it to signed-in Google accounts when cookies are missing. You turn it on in Goals › Settings, accept Google's data terms for enhanced conversions, choose how the tag collects the data, and validate it in diagnostics.

The data is normalized and hashed with SHA256 before it leaves the browser. It recovers conversions that cookie-based matching misses, for example when someone clicks on a phone and buys on a laptop while signed in to the same Google account.

Setup through GTM, per Google's enhanced conversions guide:

1. Turn it on. In Google Ads, go to Goals › Settings, expand the Enhanced conversions panel, check Turn on enhanced conversions and agree to the compliance statement. Choose Google Tag Manager as the method.
2. Allow user-provided data. In the Google tag's settings (in GTM, open the Google tag and select Manage), click Allow user-provided data capabilities.
3. Choose a collection method. Automatically detect user-provided data is the quickest. Specify CSS selectors or JavaScript variables gives more control. Add a code snippet is the most accurate, because your developer passes clean, formatted data on every conversion.
4. Handle multi-step checkouts. If the email is entered on an earlier page than the conversion page, add a GTM tag of type Google Ads › Google Ads User-Provided Data Event on the step where the data is entered.
5. Validate. In Tag Assistant, the conversion hit should carry hashed fields (the email shows as a long hashed string). In Google Ads, check the enhanced conversions diagnostics on the conversion action. Google shows impact results after about 30 days.

Two 2026 changes matter here. Since April 2026, enhanced conversions for web and for leads are a single on/off setting, and existing accounts were migrated automatically. And imported GA4 conversions still can't use enhanced conversions, which is one more reason to track your main action natively.

How do lead-gen businesses track offline conversions in Google Ads?

Capture the click ID with every lead, store it in your CRM, and send Google Ads the leads that became qualified or closed, with their value. This is offline conversion import, and it's how Google learns the difference between a paying client and a tire-kicker or a spam form.

Form or callHidden fields capture gclid, gbraid or wbraid plus email

CRMLead saved with click ID and timestamp

Sales outcomeLead marked qualified or won, with deal value

ImportData Manager or API sends it to a Google Ads conversion action

1. Capture the IDs. Add hidden fields to every form for gclid, gbraid and wbraid, filled from the landing page URL or the _gcl_aw cookie so the ID survives page changes. GCLIDs are case-sensitive, so store them exactly as received.
2. Store them with the lead. Map those fields to the contact or deal record in your CRM (HubSpot, Salesforce, GoHighLevel and similar). Also keep the email and phone, which enhanced conversions for leads can use as match keys.
3. Create an import conversion action. In Goals › Conversions › Summary, create a conversion action whose data source is an import, not the website tag, for example "Qualified lead" and "Closed won". Set the click-through window to cover your sales cycle. Wait 4 to 6 hours after creating it before the first upload.
4. Upload on a schedule. Connect the CRM or a Google Sheet through Data Manager, or send conversions programmatically. Include the click ID, the conversion time with time zone, and the value.

If you're starting from scratch, Google recommends enhanced conversions for leads over classic GCLID-only import. It matches on hashed email or phone as well as the click ID, and Google reports that advertisers who added first-party data alongside GCLIDs saw a median 10% increase in conversions compared with standard offline imports. For GBRAID and WBRAID, the API accepts them in place of a GCLID, but custom conversion variables aren't supported with them.

How do you track phone calls from Google Ads?

Google Ads tracks three kinds of calls: calls from ads (call assets and call ads), calls from your website after an ad click, and calls you import from your own call system. For home-service businesses, calls are often the most valuable conversion in the account, so set all three up deliberately.

A call counts as a conversion when it lasts longer than the minimum duration you set, so a 10-second wrong number doesn't train bidding. In the US and Canada, Google can also analyze call recordings with AI to judge lead quality, falling back to duration when a call isn't recorded. A click on a tel: link is a weaker signal because it doesn't tell you if the call connected, so keep it Secondary once real call tracking is live. If you run Google Ads for a plumbing company or another call-driven trade, set the minimum duration to the length of a real booking conversation, often 60 to 120 seconds.

Do you need Consent Mode v2 for Google Ads conversion tracking?

Yes, if any of your visitors are in the European Economic Area. Google requires valid consent signals for EEA users, and Consent Mode v2 is how Google tags receive them. It adds ad_user_data and ad_personalization to the original ad_storage and analytics_storage signals.

Google's consent mode reference states that ad_user_data is required for measurement use cases such as enhanced conversions and tag-based conversion tracking. When a visitor denies consent, Google tags stop setting cookies and send cookieless pings instead, and Google models the missing conversions. There are two implementations:

• Basic: Google tags don't load until the visitor interacts with the banner. Nothing is sent without consent, and modeling uses a general model.
• Advanced: tags load with consent defaulted to denied and send cookieless pings until consent is granted, which enables an advertiser-specific model and better recovery of lost conversions.

Consent Mode doesn't show a banner by itself. You need a consent management platform that passes the choices to your tags. For US-only businesses it's not a Google requirement today, but stores that ship internationally usually have some EEA traffic. If you need it built and tested end to end, see our Consent Mode v2 setup service.

How do you set up Google Ads conversion tracking on Shopify?

On Shopify, the recommended method is the Google & YouTube app. Install it, connect your Google Ads account, and confirm the default events. The app creates purchase, add to cart and begin checkout conversion actions, sets them as the account default and maps them to Shopify's events.

1. Install and connect. Install the Google & YouTube app from the Shopify App Store, connect the Google account that owns your Ads account, and under the conversion measurement section select your Google Ads account.
2. Review the event mapping. Select Manage to change which Shopify event feeds which conversion action, or to send an event to an existing action using its AW-ID/label string.
3. Confirm enhanced conversions. The app prompts you to confirm enhanced conversion settings; accept so purchases carry hashed first-party data.
4. Remove duplicates. Delete legacy Google Ads snippets from old checkout scripts, theme code or custom pixels, and make sure a GA4-imported purchase isn't also Primary. Google's own Shopify guide tells you to set the app's conversions as Primary and remove legacy tags.

Duplicate purchase tracking is the most common Shopify problem we find. If Google Ads reports noticeably more purchases than Shopify's orders for ad traffic, check for two Primary purchase actions before touching bids. Our eCommerce Google Ads management starts every account with this check for that reason.

How do you check if Google Ads conversion tracking is working?

Test the tag with Tag Assistant, then confirm the conversion action's status in Goals › Conversions › Summary, then compare Google Ads numbers against your real orders or CRM leads. Each check catches a different kind of failure.

1. Tag Assistant. Open tagassistant.google.com (or GTM Preview), connect your site and complete a test conversion. Select your AW- Google tag and confirm the conversion event fired once, with the correct label, value, currency and transaction ID.
2. Cookie check. Land on your site with a ?gclid=test123 parameter, then in Chrome DevTools › Application › Cookies confirm a _gcl_aw cookie was written on your domain. A test parameter proves storage works; it won't create a conversion in your reports, because only real ad clicks can.
3. Status column. In Google Ads, go to Goals › Conversions › Summary and read the Status column for each action. Click the status to see alerts, then View details for the full list.
4. Reconcile. After a week of traffic, compare conversions from paid search against your store or CRM for the same click dates. Some gap is normal (consent, blockers, cross-device), but a large gap in either direction means something is missing or duplicated.

Google has been rolling out new conversion status names, so you may see either set:

Why isn't Google Ads tracking my conversions?

Most missing conversions come from a broken click ID chain, a trigger that never fires, or a conversion action that isn't Primary for the campaign. Inflated numbers usually come from double counting. Work through this list in order:

• Auto-tagging is off, or a redirect, URL shortener or page builder strips the gclid from the landing page URL.
• No Google tag or Conversion Linker on the landing page. The conversion tag fires, but there's no stored click ID to match.
• Cross-domain journey. The checkout or booking tool is on another domain and the linker isn't configured to pass the click ID across.
• The trigger doesn't fire because the thank-you URL changed, the form submits via AJAX, or the data layer event was renamed.
• The action is Secondary or isn't in the goal the campaign optimizes toward, so it appears in All conv. but not in Conversions.
• Consent denied for EEA visitors without Consent Mode, so tags are blocked instead of sending cookieless pings.
• Double counting from two Primary actions for the same event (native tag plus GA4 import plus a platform app), a thank-you page that fires on refresh, or Count set to Every for leads.
• Reporting timing. Conversions are credited to the date of the ad click, and anything after your click-through window isn't recorded at all.

What does 0.5 conversion mean in Google Ads?

A fractional conversion means data-driven attribution split the credit for one conversion across several ad interactions. The conversion happened once; the model is showing how much each click contributed.

Illustrative example: someone clicks your ad for "gas fire pit" on Monday and your ad for "outdoor fire pit table" on Thursday, then buys. Under last click, the second keyword gets 1.0 conversion. Under data-driven, the model might give each keyword 0.5, or 0.3 and 0.7, depending on how those paths convert in your account. Add the fractions across keywords and you get whole conversions again. It's expected behavior, not a tracking fault.

If you'd rather not debug this yourself, our team handles done-for-you Google Ads conversion tracking setup, covering tags, enhanced conversions, offline imports and consent. Or start with a free Google Ads audit to see which of these issues your account has today.