Every decision in Google Ads – which keywords to keep, which ads to pause, how much Smart Bidding should bid – depends on one thing: knowing which clicks turned into customers. Without conversion tracking you are optimising for clicks, and clicks don’t pay the bills.
Yet broken tracking is one of the most common problems we find in accounts: duplicate tags, “page view” goals set as primary conversions, missing phone calls, or no consent setup. Each one quietly misleads the bidding algorithm.
This guide walks through how Google Ads conversion tracking works in 2026, the settings that matter, a step-by-step setup, enhanced conversions, consent mode, offline imports and a checklist for testing it all.
Key Takeaways
- Conversion tracking connects ad clicks to valuable actions: purchases, leads, calls, app installs and offline sales.
- Only true business outcomes should be primary conversions; micro-actions belong as secondary.
- Enhanced conversions use hashed first-party data to recover conversions that cookies miss.
- Consent mode is essential where users must consent to cookies, such as the EEA and UK.
- Data-driven attribution is now the default; first click, linear, time decay and position-based models are gone.
How Google Ads conversion tracking works
“A conversion action is a specific customer activity that is valuable to your business.”
— Google Ads Help, About conversion measurement
For a website, you install the Google tag. When someone clicks your ad, Google stores a click identifier; when that person completes the action you defined (a purchase, a form submission), the tag fires and Google matches it back to the click. Some conversion types need no tag: call tracking uses a Google forwarding number, and Google Play installs are recorded automatically.
What you can track
| Conversion source | Examples | How it’s measured |
|---|---|---|
| Website | Purchases, sign-ups, quote requests | Google tag (directly or via Google Tag Manager), or GA4 import |
| Phone calls | Calls from ads, calls from your website | Google forwarding numbers, website call tracking |
| App | Installs, in-app purchases | Firebase, Google Play, third-party app analytics |
| Offline / CRM | Closed deals, in-store sales | File uploads, API, enhanced conversions for leads |
The settings that matter
| Setting | Options | Our recommendation |
|---|---|---|
| Primary vs secondary | Primary actions are used for bidding; secondary are “for observation only” | Primary = sales, qualified leads. Secondary = add to cart, page views, scroll |
| Count | Every or One | Every for purchases; One for leads |
| Click-through window | 1–90 days depending on source (default 30) | Match your sales cycle; longer for B2B |
| Value | Same value, different values, no value | Pass real transaction values for ecommerce; estimated lead values otherwise |
| Attribution model | Data-driven or last click | Data-driven unless you have a specific reason |
Google’s attribution page is clear on the change: “The first click, linear, time decay, and position-based attribution models are no longer supported by Google.” If you need cross-channel views beyond Google, read our guide to marketing attribution.
How to set up conversion tracking (step by step)
- Define your conversions. List the actions that make money – purchase, booked call, qualified lead – and assign a value to each. Keep the list short.
- Create the conversion action. In Google Ads go to Goals › Conversions › Summary › New conversion action, choose Website and enter your domain. Google will scan the site and suggest options.
- Choose the setup method. Either use Google’s URL- or event-based setup, install the Google tag manually, or use Google Tag Manager (best for most businesses).
- Install the Google tag on every page. Then add the conversion event on the thank-you page or on the successful form submission/purchase event.
- Pass dynamic values. For ecommerce, send order value, currency and transaction ID (the ID prevents duplicates).
- Turn on enhanced conversions. Send hashed email or phone from the conversion page (see below).
- Implement consent mode. Connect your consent banner so tags respect user choices.
- Add call tracking. Use call assets with forwarding numbers and website call conversions if phones matter.
- Set primary/secondary status. Make sure only your real goals are primary and included in the campaign’s goals.
- Test. Use Tag Assistant to preview, complete a test conversion, and confirm the status changes to “Recording conversions” within a day or so.
Enhanced conversions
Cookies don’t capture everything – browsers restrict them, people switch devices. Enhanced conversions supplement your tags with first-party data the user gave you, such as an email address. According to Google, the data is normalised and hashed with SHA256 before being sent, then matched to signed-in Google accounts.
- Enhanced conversions for web – for online purchases and sign-ups.
- Enhanced conversions for leads – for leads that close offline. Hashed form data is matched to sales you later import from your CRM.
Make sure your privacy policy discloses this, and only send data collected lawfully.
Consent mode
Consent mode passes your users’ cookie choices to Google tags. As Google notes, “Consent mode doesn't provide a consent banner or widget” – you need a consent management platform for that. In basic mode, tags don’t load until users consent. In advanced mode, tags load with consent denied by default and send cookieless pings, which allows Google to model conversions more precisely. Which to choose is a legal and business decision; get advice for your markets.
Offline conversion imports
For lead-gen businesses, the real goal isn’t a form fill – it’s a signed customer. Importing CRM outcomes (qualified lead, closed deal and its value) lets Smart Bidding optimise for leads that become revenue. This is the single biggest upgrade most B2B and service accounts can make, and it is what makes value-based bidding and ROAS targets meaningful.
Testing checklist
- Each conversion action fires once per real conversion – no duplicates on page refresh.
- Transaction IDs are passed for purchases.
- Values and currency match your order system.
- Enhanced conversions diagnostics show healthy match rates.
- Conversions in Google Ads roughly reconcile with your CRM or shop (allow for attribution differences).
- Conversions appear in GA4 as expected and UTM or auto-tagging is not stripped by redirects.
Common mistakes
- Too many primary conversions. Page views or time-on-site as primary goals teach Smart Bidding to buy cheap, useless traffic.
- Double counting. The same purchase tracked by both the Ads tag and a GA4 import, both primary.
- No values. Without values you can’t use ROAS bidding or judge profitability.
- Counting every lead. One person submitting three forms isn’t three leads.
- Ignoring calls. Service businesses miss a large share of conversions without call tracking.
- Never re-testing. Site redesigns and checkout changes silently break tags. Include tracking in every PPC audit.
With tracking in place, you can finally make sound decisions about cost per click, bids and budgets – and pick the right bidding strategy. The same principles apply to Microsoft Advertising’s UET tag.
Related Guides
- How to Do a PPC Audit: Step-by-Step Checklist
- Ad Copywriting: How to Write Ads That Get Clicks
- Cost Per Click (CPC): What It Is and How to Lower It
Frequently Asked Questions
Should I use the Google Ads tag or import GA4 conversions?
Both work. The Google Ads tag with enhanced conversions is usually the most direct and complete for bidding, while GA4 imports are simpler if GA4 is already well configured. Avoid using both for the same action as primary, or you will double count.
What is the default conversion window?
For Search and Display, the click-through conversion window defaults to 30 days and can be set from 1 to 90 days depending on the conversion source.
Should I count every conversion or one?
Count every conversion for purchases, where each sale has value. Count one per click for leads, where repeat form fills from the same person do not add value.
Do I need consent mode?
If you have users in regions with consent requirements such as the EEA and UK, you should implement a consent banner and consent mode so Google tags respect user choices and conversions can be modelled when consent is denied.
Why do Google Ads and GA4 show different conversion numbers?
They use different attribution models, conversion windows and date logic (Google Ads records conversions against the click date). Small differences are normal; large gaps usually mean a tagging problem.
Conclusion
Conversion tracking is the foundation of every profitable Google Ads account. Track only real business outcomes as primary, pass values, add enhanced conversions and consent mode, and import offline results where you can. Then test it regularly. If you are not sure your numbers can be trusted, our PPC management team can audit and fix your tracking – request a free quote.
References
- About conversion measurement – Google Ads Help
- About enhanced conversions – Google Ads Help
- About consent mode – Google Ads Help
- Primary and secondary conversion actions – Google Ads Help
- About conversion counting options – Google Ads Help
- About conversion windows – Google Ads Help
- About attribution models – Google Ads Help
- 9 PPC Metrics to Track & How to Optimize Them – Semrush Blog
