How to Check if Google Analytics is Installed on a Website? (8 ways)

Updated: March 29th, 2025

Let’s say you are a freelancer or an agency that just got a new client. And you want to check if they have Google Analytics installed on a website. How do you check that?

There are multiple ways, and in this blog post, I will share 8 methods to check if Google Analytics is installed.

Note: you don’t have to use all nine methods on the same website. If at least one of the options returns a positive result, it means GA is installed on a website. The goal of this article is to list different solutions/methods so you can pick your favorite.

Table of contents

– Hide table of contents –

• #1. View page source
• #2. Check other files of a website
• #3. Check the Network Tab in Developer Tools
• #4. GA debugger
• #5. Cookies
• #6. Ghostery
• #7. Screaming frog
• #8. Ask the client/company
• #9. Check via tagassistant.google.com
• Final words

#1. View page source

One of the most popular ways is to open the website, do right-click on the background of the website, and then select View page source (or something similar because the exact text might differ on various browsers).

Then, start searching for code snippets related to Google Analytics. On Windows, you should click CTRL + F and enter the following texts (search them one by one):

• gtag. If you find this, the website is using GTAG, which is a JavaScript library of Universal Analytics (GA3) or Google Analytics 4.
  
  • In that code snippet you find, keep looking for the tracking/measurement ID in the config command. If it looks like “UA-XXXXXXX-X”, that is a GA3 tracking code (but it still can be connected to GA4).
  • If it is “G-XXXXXXX”, that code is used by Google Analytics 4
• analytics.js. This is used by Universal Analytics (GA3), which is an outdated version. If your website is still using, you should migrate to GTAG (or GA4 + Google Tag Manager) as soon as possible.
  

Also, there is a chance that the website is using Google Tag Manager to activate Google Analytics. So if you cannot find either gtag.js or analytics.js, look for gtm.js. If you find it, that might require further digging and using one of the other tips in the blog post (for example, using the Network tab in the developer tools).

Also, if gtm.js is spotted, you will need to get access to the Google Tag Manager container of that website and then check the “Tags” section of it. If you see GA4 tags there, this means GA is installed.

#2. Check other files on a website

Sometimes, it is possible that you cannot find the Google Analytics (and Google Tag manager) tracking code by using “View page source”. Some developers prefer storing various JavaScript codes in other files of the website.

To check if that is your case, open the Developer tools of your browser. I usually work with Google Chrome. Thus the instructions will use that.

If you are on Windows, click F12. If you are on Mac, click Option + Cmd + J. Then go to Sources.

Then click CTRL + SHIFT + F (if you are on Windows) or Option + Cmd + F. This will open a search that will look through all the files loaded on a website (including JavaScript files).

Enter the same keywords as in the previous tip of this blog post (one by one), like gtag, analytics.js, and gtm.js.

If you see any useful results, it means that Google Analytics is installed on a website.  However, remember that your Chrome extensions also might have GA installed.

So if you see chrome-extension (like in the screenshot below), ignore it.

Also, if you see some domains (that are not your website’s), ignore them too.

Your goal is to find a particular file of your website where the tracking code is installed, and those files will display it (see the screenshot below as an example).

However, having the tracking code installed is not enough. You need to verify if the code is actually working and it’s sending data to Google Analytics. Let’s take a look at the next tip.

#3. Check the Network Tab in Developer Tools

If you are on Windows, click F12. If you are on Mac,  click Option + Cmd + J. Then go to Network. This is where you will see a list of requests sent from your website and all the resources that were downloaded (including requests to Google Analytics).

In the search field, enter collect and then refresh the page. If Google Analytics is installed on a website, you should see requests that look like this:

• collect?v=1 (this is used by Universal Analytics (GA3))
• or collect?v=2 (this is used by Google Analytics 4)

Those requests will also contain a measurement/tracking ID. It will contain either “UA-” or “G-“.

You can click on any of those requests and see where they were sent and other parameters (like dl, cid, tid, etc.). If you see it too, this means Google Analytics is installed on a website.

#4. GA debugger

Another useful Chrome extension. Go to this page and install the GA debugger (if you haven’t done that yet). Then open the list of your installed extensions and click this (while you are on a website).

The page will refresh, and the extension’s icon will change to this.

Now, open the developer tools. If you are on Windows, click F12. If you are on Mac,  click Option + Cmd + J. Again, I will show this example with Chrome.

Go to the Console, clear everything, and refresh the page.

If you see something like this in the console, the GA debugger found Google Analytics requests (which signals that Google Analytics is installed on a website).

#5. Cookies

When Google Analytics is installed on a website, it sets one or more cookies. One of the cookies is called _ga.

Open developer tools (as I explained in previous chapters) and go to Application. Then click Cookies and select your website’s domain.

Then, in the search field, enter _ga

If you see at least one _ga cookie in the list, check the Domain column. The cookie must be set on your website’s domain.

If that’s what you see, this means Google Analytics is installed on a website.

#6. Ghostery

One more browser extension! This time, it’s Ghostery. Maybe you already have it installed; in that case, let’s see how you can use it.

Go to the website where you are looking for Google Analytics. Then click on the Ghost icon in your Chrome extensions list.

It will show you a simple view of how many trackers were spotted/blocked. Switch to a Detailed view and see if Google Analytics is displayed there.

If GA is there, it means it is installed on a website.

#7. Screaming frog

What if you find yourself in a situation where you want to check if Google Analytics is correctly installed on all pages (and there are hundreds or thousands of pages)?

In that case, a Screaming Frog crawler might be very handy.

Screaming Frog is a paid solution that is especially popular among SEO professionals who want to check what’s happening on their clients’ websites. How is it related to GTM? You could configure it to crawl the entire website and look for https://www.googletagmanager.com/gtag/js in the website’s source code. This URL is used by the Google Analytics tracking code (GTAG).

In Screaming Frog’s application, go to Configuration > Custom > Search and enter the following condition:

Does not contain https://www.googletagmanager.com/gtag/js

Enter the URL of the website you wish to check and hit the Start button.

That’s it! As the crawl progresses, you’ll be able to see the full URLs of the pages where your GTM container code is missing. Your next step is to add the tracking code to those pages or ask a developer to do that.

If, on the other hand, you want to know if Google Tag Manager is installed on all pages, repeat the same process but look for https://www.googletagmanager.com/gtm.js instead of https://www.googletagmanager.com/gtag/js.

#8. Ask the client/company

This method is often underrated. If you are starting to work on a new analytics/marketing project that involves Google Analytics, ask your colleagues/client/etc if Google Analytics is already used. That might give you new information that no previous tip would have given you.

For example, you might face an edge case where none of the previous tips (mentioned in this article) showed that Google Analytics is installed, but then your colleague/boss/client says that they use GA after all. How can that be?

One of the possible examples is that maybe they are using server-side tagging when they send some generic requests from the website to their own server. After that, that request is transformed in the server, and then it is sent to Google Analytics.

Or maybe they have installed some plugin on a website that sends data directly to Google Analytics.

So my best tip here would be to ask the company/client/boss/whatever if they are using Google Analytics on a website and then verify that with one of the methods above.

If none of the methods worked, ask them to explain how GA is installed and if they still see data in their reports (chances are that nobody checked the reports for months, and GA was accidentally removed months ago).

#9. tagassistant.google.com

Google Tag Assistant (a.k.a. Preview mode) is not just for Google Tag Manager. You can also use it to check if a website has GA4 installed.

Go to tagassistant.google.com and click Add domain.

Enter the domain of your website and click Connect. Then, at the top of Tag Assistant, click on your GA4 measurement ID (if it’s not already selected).

At the bottom of the screen, you’ll see hits/requests that are related to Google Analytics.

If you don’t see anything related to Google Analytics, then GA4 is not installed (or maybe the website uses Server-side tagging to modify Google Analytics requests and make them harder to spot).

Check if Google Analytics is installed on a website: Final words

These are the most common ways to check if Google Analytics is installed on a website. Personally, I usually check the Network tab of the browser developer tools.

By looking for requests that contain /collect?, I can quickly find GA requests (even if Google Analytics sends data to a server-side endpoint).

Also, the “View page source” option is used pretty often in my arsenal because most websites add the tracking codes directly to the index file of the website.

If you know other practical and convenient ways of checking the Google Analytics installation, let me know in the comments.