Google Analytics 4July 28, 20263 min read

What Is a GA4 Key Event? Differences Between Conversion and Key Event

Google Analytics 4 (GA4) is an analytics platform that measures user behavior on an event basis.

Google Analytics 4 (GA4) is an analytics platform that measures user behavior on an event basis. Every interaction a user performs is recorded as an event, and this data lets businesses analyze their performance.

In 2024, Google made a significant terminology change inside GA4, largely replacing the concept of "Conversion" with "Key Event". There is an important detail here, though: the concept of Conversion has not disappeared entirely. On the Google Ads side in particular, the term conversion is still in use.

Differences between Conversion and Key Event

Conversion is the older term used within GA4.
Key Event is the new term used in place of Conversion.
Both work on the same logic: marking certain events as important.
The term Conversion is still used in Google Ads reporting.
In the GA4 interface, the term Key Event is now front and center.
The underlying setup has not changed; only the terminology has been updated.

Why did GA4 Conversion change to Key Event?

The main reason Google made this change was to make measurement easier for users to understand.

The word "Conversion" often suggested nothing more than a sale or a purchase. Yet for many businesses, the user actions that matter go well beyond sales.

For example:

Form submission
Quote request
Membership sign-up
Demo request
Newsletter subscription

That is why Google Analytics 4 moved to the more inclusive term "Key Event".

The change also fits GA4's event-based data model more closely.

What are the main differences between Key Event and Conversion?

Although the two are similar in structure, there are a few differences.

In short, there is no major change on the technical side. The real change is in reporting and terminology.

How do you create a Key Event in Google Analytics 4?

Marking an event as a Key Event in GA4 is straightforward. Follow the steps below to define the user interactions that matter to your business as Key Events.

1. Go to the Admin panel

In your Google Analytics 4 account, open the Admin area in the lower left.

2. Go to the Events page

In the Admin panel, follow the Data Display > Events path.

This screen lets you view the events collected in your property and the actions marked as Key Events.

3. Find the event you want to mark as a Key Event

Find the event in the list that matters to your business.

For example:

generate_lead
sign_up
form_submit
begin_checkout

Since every business has different goals, the choice of Key Events varies by industry as well.

4. Activate the star icon

Click the star icon to the left of the event.

Once the star is active, GA4 treats that event as a Key Event going forward.

5. Track it in your reports

Marked events start showing up in GA4 reports within a short time.

That way you can analyze the user actions that are critical to your business separately and track performance far more easily.

Note: Marking an event as a Key Event does not affect historical data. Only the data collected after you mark it is included in Event reports.

The advantages of using GA4 Key Events, and reporting

The GA4 Key Event structure helps businesses focus on their most important user interactions. Reporting gets simpler, performance analysis becomes more meaningful, and business goals are easier to track.

The main advantages are:

It separates important user actions from all the other events.
It helps you track the performance of business goals more clearly.
It makes user behavior and conversion journeys easier to analyze.
It simplifies performance evaluation by traffic source and marketing channel.
It allows for more detailed analysis in custom reports and GA4 Explorations.
It helps teams build shared criteria for success.
It makes changes in website or app performance easier to follow.

With well-defined Key Events, businesses do more than collect data; they can also interpret user behavior far more effectively in light of their business goals.

Conclusion

The GA4 Key Event structure is a terminology update built to bring the user interactions that matter to a business to the foreground.

The concept of Conversion has not disappeared entirely. It is still in use on the Google Ads side in particular. In the Google Analytics 4 interface, however, the term Key Event is what you will see now.

With well-defined Key Events, you can analyze user behavior more effectively and make data-driven decisions.