How to Track AI Traffic from AI Overviews (and ChatGPT) in GA4

What Counts as AI Traffic?

When we say AI traffic, we’re typically referring to:

• Google AI Overviews
• Featured Snippets
• People Also Ask results
• ChatGPT referrals
• Perplexity referrals
• Other AI tools sending traffic to your site

But they do not appear in GA4 as “AI.”

They blend into other channels.

Here’s what that looks like by default:

That’s why most teams can’t separate AI Overview traffic from regular SEO traffic.

And that’s where proper tracking comes in.

Adding the required JavaScript variables in Google Tag Manager.

Step 1: Add JavaScript Variables in Google Tag Manager

This is where most setups break.

If you don’t send the right data from Google Tag Manager (GTM) to GA4, nothing downstream will work.

We’re going to:

• Create two Custom JavaScript variables
• Attach them to your GA4 page view tag
• Send them as event parameters

Create Custom JavaScript Variables

Go to:

Google Tag Manager > Variables > User-Defined Variables > New

Choose:

Variable Type > Custom JavaScript

You’ll create two variables.

Variable #1

Name:

JSURLSnippetStart

Paste the JavaScript provided below:

function() {

var entries = decodeURIComponent(performance.getEntries()[0].name.match("#:~:text=(.*)")[1]);

var frag = entries.replace(/, /g,"*").replace(/,/g,"...").replace(/*/g,", ");

var splitArray = frag.split("...");

return splitArray[0];

}

Save.

Variable #2

Click New again.

Name:

JSURLSnippetEnd

Paste the second JavaScript snippet below:

function() {

var entries = decodeURIComponent(performance.getEntries()[0].name.match("#:~:text=(.*)")[1]);

var frag = entries.replace(/, /g,"*").replace(/,/g,"...").replace(/*/g,", ");

var splitArray = frag.split("...");

return splitArray.slice(1).join("...");

}

Save.

You should now see both variables in your User-Defined Variables list.

How to Validate That AI Traffic Tracking Is Working

There are two things to verify:

1. AI Overview audience is populating
2. AI Tools channel is classifying correctly

Validate AI Overview Tracking

Go to:

GA4 > Reports > User > Audiences

Find:

AI Source Visitors

You should start seeing users populate over time.

Important:

• Data is not retroactive
• It only tracks new sessions
• Initial visibility may take 24–72 hours depending on traffic volume

Validate AI Tools Channel Group

Go to:

GA4 > Reports > Acquisition > Traffic acquisition

Change the primary dimension to:

Session default channel group

Select your new channel group (AI Tools Added).

You should now see:

A separate AI Tools channel.

Click into it.

Then add Session source/medium as a secondary dimension.

You should see sources like:

• chat.openai.com
• perplexity.ai
• gemini.google.com

If those are still showing under Referral:

Your channel order may be incorrect.

How to Use AI Traffic Data (And Prove ROI)

Once AI traffic is isolated, the real opportunity begins.

Most brands stop at “we’re getting AI visits.”

That’s not enough.

You want to answer:

• Is AI traffic engaged?
• Does it convert?
• Is it influencing pipeline?
• Is it different from traditional SEO traffic?

Compare AI vs Organic Performance

Go to:

Reports > Acquisition > Traffic acquisition

Compare:

• AI Source Visitors audience
• Organic Search

Look at:

• Engagement rate
• Average engagement time
• Conversion rate

Analyze Conversions Specifically from AI Traffic

Go to:

Explore > Free Form

Add:

• Dimension: Audience name
• Metrics: Conversions, Event count, Revenue

Filter for:

AI Source Visitors

Look at Assisted Conversions

Use Attribution reports to see:

• Assisted conversions
• Path exploration

Build Remarketing Audiences

Now that AI traffic is segmented:

You can create remarketing audiences such as:

• AI visitors who didn’t convert
• AI visitors who viewed pricing
• AI visitors who engaged 60+ seconds

Quick Summary

Need Help Setting This Up?

If this feels technical… that’s because it is.

AI traffic tracking requires:

• Custom GTM variables
• Proper GA4 configuration
• Correct parameter mapping
• Ongoing validation

One small mistake — and your data won’t be reliable.

If you’d rather focus on growing your business instead of configuring tracking frameworks, our team can handle the full setup for you.

We’ll implement it correctly, validate it, and build reporting that clearly shows how AI traffic impacts your pipeline.

Explore our Reporting & Analytics Services