Key events in Google Ads: What they are and how to track them

Abisola Tanzako | Apr 29, 2026

Key events in Google Ads: What they are and how to track them

Table of Contents

  1. What are the key events in Google Ads?
  2. Key event vs. Conversion in Google Ads: what is the difference?
  3. What are the common types of key events in Google Ads?
  4. How can you verify that key events are tracking correctly?
  5. What causes key events to suddenly drop or spike?
  6. Tracking error or real drop in key events: what is causing it?
  7. How do you set up key events in Google Ads?
  8. What tools help diagnose key event issues?
  9. How to maintain accurate key event tracking in Google Ads

Key events in Google Ads are important user actions, such as purchases, form submissions, or calls, that you mark as valuable for your business.

They help Google understand what success looks like in your campaigns and guide Smart Bidding decisions.

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If clicks are rising but conversions are not, the issue is often incorrect key event setup, not your ads or bids.

In this article, you’ll learn what key events are, how they differ from conversions, why they matter for performance, how to check if they’re set up correctly, and what to do when they suddenly drop or spike.

What are the key events in Google Ads?

Key events in Google Ads are specific user actions that you define as valuable to your business and want Google to prioritize when optimizing your campaigns.

In simple terms, they are the actions that signal real success, not just clicks. These actions can include things like:

  • Purchases on your website
  • Form submissions (lead generation)
  • Phone calls from ads
  • Sign-ups or registrations
  • Add-to-cart or checkout actions (for e-commerce)

Key event vs. Conversion in Google Ads: what is the difference?

GA4 key events are interactions you mark for measurement, while Google Ads conversions are tracked actions used for reporting and bidding optimization (when set as primary).

This means GA4 focuses on tracking, while Google Ads focuses on optimizing campaigns.

Metric Key event (GA4) Conversion (Google Ads)
Where it lives Google Analytics 4 Google Ads
What it is An event marked as important for measurement and reporting A tracked action used for reporting and (if primary) bidding optimization
Bidding impact None directly Directly influences Smart Bidding when set as a primary conversion
Primary vs. secondary? No primary/secondary distinction Has primary (used for bidding) and secondary (reporting only)
Can you have too many? Can make reporting harder if excessive Too many low-value conversions can weaken bidding signals

What are the common types of key events in Google Ads?

Common key events used in Google Ads are the actions that show real business value, not just clicks.

The most common ones include:

  1. Purchases: completed sales on an e-commerce site
  2. Lead form submissions: when a user fills out a contact or signup form
  3. Phone calls: calls made directly from an ad or a website click
  4. Sign-ups/registrations: account creation or newsletter subscriptions
  5. Add-to-cart actions: when users show purchase intent
  6. Checkout starts or completions: steps in the buying process
  7. App installs or in-app actions: for mobile app campaigns

How can you verify that key events are tracking correctly?

To verify that key events are tracking correctly in Google Ads, check that the actions you marked as important (like purchases, form submissions, or calls) are actually being recorded and matching real user activity.

Start by confirming that the key event is properly set up in Google Analytics 4 and correctly linked to Google Ads.

Then review the “Conversions” column in Google Ads reports to see if the events are being captured.

You should also compare the numbers with your website or app data to ensure they align. If the data is missing, delayed, or inconsistent, it usually means the tracking tag, event setup, or import configuration needs to be fixed.

What causes key events to suddenly drop or spike?

Sudden drops or spikes in key metrics in Google Ads are usually caused by changes to tracking, traffic, or campaign settings, not by random performance shifts alone. Here are the most common causes:

  1. Tracking or tag issues: A broken, removed, or misfiring tag in Google Tag Manager or GA4 can cause events to stop or duplicate.
  2. Website or funnel changes: Updates to landing pages, forms, checkout flow, or button IDs can stop key events from firing correctly.
  3. Campaign or targeting changes: Shifts in audience targeting, budgets, or ad scheduling can suddenly increase or reduce high-intent traffic.
  4. Attribution or conversion setting changes: Changing attribution models, switching primary/secondary conversions, or editing conversion actions can make numbers jump or drop unexpectedly.
  5. Data delays or processing issues: Sometimes, reporting lags or temporary processing delays in Google systems cause short-term fluctuations.
  6. Traffic quality changes: An influx of low-quality traffic (or its removal) can distort results and make key events appear to spike or drop.

Tracking error or real drop in key events: what is causing it?

Before running a full audit, five minutes is usually enough to determine whether a drop in key events is a tracking issue or a real performance decline.

Signal Likely tracking issue Likely real drop
Key events drop to zero overnight Yes, the tag is likely broken Rare
Key events drop 20–40% gradually Possible, check consent Likely real, check traffic
Click volume unchanged Suggests tracking issue Also possible if the traffic quality changed
Landing page sessions still normal Suggests tracking issue Less likely
Site update was deployed recently Strong indicator Coincidence possible
Seasonally expected period Less likely Very likely
Revenue data matches drop Less likely to be tracking Confirms real drop

How do you set up key events in Google Ads?

To set up key events in Google Ads, you first define what actions matter to your business (like purchases, form submissions, or calls), then configure and import them so Google can track and optimize them.

Here’s how it works in practice:

  1. Start by making sure the event is created in Google Analytics 4 (GA4) or directly in Google Ads if you’re using the Google Ads tag.
  2. In GA4, you mark the action as a key event (formerly called a conversion event). Then you link GA4 to Google Ads and import those key events into your Google Ads account.
  3. Once imported, go to the “Conversions” section in Google Ads and decide which events should be primary conversions (used for bidding) and which should be secondary (for reporting only). Smart Bidding will optimize for primary conversions.
  4. Finally, test the setup by triggering the action yourself or using the Tag Assistant tool to confirm that the event fires correctly.

What tools help diagnose key event issues?

There are several tools available to help diagnose what went wrong with your tracking of key events.

  1. Google Tag Assistant: (included as part of Google Tag Assistant Legacy for Chrome) allows you to check whether your tags fire properly and send accurate names and parameters.
  2. GA4 DebugView: displays event firing in real time if the device/session is in debug mode; therefore, it can be helpful when testing new setups before going live.
  3. Google Ads Conversion Diagnostics: includes built-in functionality to detect common problems with conversion actions, such as unverified tags, deactivated conversions, and conflicting attribution models.
  4. ClickPatrol: offers an additional monitoring step on top of your tag configuration by checking traffic quality, invalid clicks, or unusual behaviour that inflates click volumes without corresponding key events.

How to maintain accurate key event tracking in Google Ads

Key events in Google Ads are only as reliable as their setup. When configured correctly, they guide Smart Bidding toward meaningful outcomes; when not, they distort performance and lead to poor decisions.

That is why any sudden change in results should first be treated as a tracking check rather than an immediate campaign problem.

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To maintain accuracy, keep your setup simple, regularly review tracking after site updates, and ensure your primary conversions reflect real business goals.

In most cases, better decisions come from better data, not from changing bids too quickly.

Frequently Asked Questions

  • What are the important events in Google Ads?

    The important activity in Google Ads can be measured by user actions, such as a purchase, form completion, or phone call, that you specify as valuable and use to inform campaign optimization. They are printed in your conversion tracking, and what to optimize for is fed to Google by the Smart Bidding.

  • What are the key events and conversions in Google Ads?

    In GA4, an important event is any interaction you have tagged in Analytics as important. A conversion is an important event in Google Ads which has been imported and targeted as a bidding event. In 2023, Google renamed GA4 conversions to key events, but Google Ads still uses the term “conversion” to describe actions that affect bidding.

  • What are the steps to configure the essential events in Google Ads?

    You may also create a key event directly in Google Ads by clicking Tools > Conversions, or import one created in GA4 from the same menu. If you are already using GA4, the import approach is more organized and minimizes the risk of tracking duplication.

  • How can I import GA4 key events into Google Ads?

    In GA4, the corresponding event is marked as a key event in Admin > Events. In Google Ads, navigate to Tools Conversions, and then, to add a new conversion, click + and choose Import, Google Analytics 4. Choose the event to import and configure its attribution window and make it a primary or secondary conversion action based on whether you want it to affect bidding.

  • Why do my key events not work in Google Ads?

    A broken tracking tag, an update to the site that alters the page or element the tag was monitoring, or a consent banner that prevents tag execution are the most prevalent reasons. Begin with Google Tag Assistant and GA4 DebugView to verify the tag fires. Next, compare your key event data with your revenue data to verify that the drop is either a tracking problem or a real performance drop.

  • Why have my clicks increased, and conversions remain stagnant?

    This trend typically indicates problems with traffic quality, a mismatch between intentional keywords, or an incorrect landing page that does not meet visitors’ expectations. Invalid clicks (such as bots and accidental clicks) may inflate the click count without actually resulting in conversions. Check the quality of traffic and keyword search reports prior to revising bids or creative.

  • What is a good conversion rate in Google Ads?

    The average search campaign will range between 4-6 per cent across industries, although this again varies widely by industry, offer type, and funnel stage. It is more important to follow your own trend over time than any industry standard. The fact that the conversion rate is constant, even with variations, is more important than the actual number.

Abisola

Abisola

Meet Abisola! As the content manager at ClickPatrol, she’s the go-to expert on all things fake traffic. From bot clicks to ad fraud, Abisola knows how to spot, stop, and educate others about the sneaky tactics that inflate numbers but don’t bring real results.

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