If you’ve ever wondered what is Google Tag Manager and why everyone in digital marketing keeps talking about it — you’re in the right place. This guide breaks it all down without the tech jargon, so you can actually understand what it does and why it matters for your website.
Google Tag Manager (GTM) is a free application offered by Google that allows you to insert and change small segments of tracking code on your website — all done from one location and with zero editing of your website’s code each time you add a new piece of tracking code.
Think of GTM as a type of “control panel”. Instead of depending on an external developer every time you need to insert or alter a tracking code snippet, you can access GTM, log in using your Google account, and add/edit the new piece of code within a few minutes.
These small segments of code are known as “tags.” They provide you with information about site usage by users visiting your website — such as pages viewed, button clicks and completion of a web form (i.e., submitting your contact information) — to name a few.
Now, let’s take a moment to talk about how great this stuff really is! With Google Tag Manager (GTM) you can link up your website with all the various different tools you’re currently using to market your business. After you set everything up with GTM, you can easily add new platforms like the following:
Google Analytics (to track website traffic and measure visitor behaviour)
Google Ads (to track sales/conversions)
Meta/Facebook Pixel (for retargeting ad campaigns)
Hotjar (to view heat maps and session recordings of users who’ve visited your site)
HubSpot, Salesforce and other CRM tools
Since all of your tracking tags are now managed from one place (the GTM dashboard), you won’t have to call your developer every time you’d like to add a new tracking tag.
Google Tag Manager allows users to track an array of actions taken by their end-users, such as the following examples:
1. Button clicks (e.g., add to cart, get a quote)
2. Form submissions
3. File downloads
4. Scroll depth (i.e., how far down the page a user reads)
5. Video views
6. Shopping cart additions/abandonments
7. CTA (call to action) performance
8. Custom events that are unique to your organisation.
Tracking each of these actions will give you an event, which is sent to Google Analytics 4 (GA4), effectively providing you with a real-time dashboard displaying exactly how users are engaging with your website.
To really understand how GTM works, you need to know about its three building blocks: Tags, Triggers, and Variables.
Tags are the actual snippets of code that collect data and send it to your marketing platforms. Think of them as little observers quietly watching what users do on your site.
Some popular tags you’ll come across include:
A tag doesn’t fire on its own. It needs a trigger — basically a rule that tells the tag when to activate.
For example, you might want your Google Analytics tag to fire every time someone views a page. But your conversion tag? That should only fire when someone completes a purchase. Triggers make that level of control possible.
Common triggers include:
Variables add extra context to your tags and triggers. They store specific bits of information GTM might need, like your Google Analytics Measurement ID, a specific page URL, or the class name of a button that was clicked.
Instead of re-entering your tracking ID every time you build a new tag, you just create a variable once and reference it everywhere. It’s a big time-saver.
The process is actually quite simple. All you need to do is install GTM’s one-time code (referred to as a “container snippet”) on your site. That’s all you have to do!
When a visitor accesses your page, GTM will continue to run in the background and monitor visitor activity behind the scenes. Every time a visitor performs an action (i.e., clicks on a button), GTM will check to see if that action is defined by one of your triggers. If it is, then GTM will execute the tag associated with that trigger, which will send information to the appropriate platform (e.g., Google Analytics or Facebook Pixel).
Once you install GTM’s container snippet, there is no additional code that will need to be added or edited on your site. GTM will automatically execute the code to insert, update, or remove the tags that are associated with the actions you set up in GTM based on visitor activity. By doing so, GTM helps keep your website as small and efficient as possible and helps to minimize the chance of tracking scripts breaking.
You might be wondering — why not just add tracking codes directly to the site? Here’s why GTM is the smarter choice:
Speed and independence: Marketers can add or update tags without waiting days for a developer to make the change.
Fewer errors: All your tracking codes live in one organized place, making it much harder to accidentally break something.
Preview and test before going live: GTM’s Preview Mode lets you check that everything works correctly before publishing changes to your live site.
Version control: Every time you publish changes, GTM saves a new version. If something breaks, you can roll back instantly.
Team collaboration: Multiple team members can work in separate workspaces without overwriting each other’s progress.
Security and permissions: You control who can view, edit, or publish tags — so changes only go live when authorized.
This is an often-encountered inquiry. The basic response is that the two products are very different but work together very closely regarding how they interact with your web analytics tracking codes when installing them. Google Tag Manager handles how tracking codes are installed and the creation of those codes. Google Analytics is the destination where all the data collected via your tracking codes will be stored. In short, you can use GTM to create, configure and deploy your GA tags, with GTM ensuring the data from those tags is sent to Google Analytics for analysis.
Using Google Tag Manager for the first time is more straightforward than it sounds:
No longer does the task of managing tracking codes have to be done strictly by developers and that can be done by a marketing team using Google Tag Manager. Instead of writing out the tracking code manually every time a tool needs to be added to the website/existing code, GTM allows the marketing team to use one place to manage the tracking code, which is much quicker and much safer than editing the actual code to your website.
You can also use GTM to set up tracking for simple form submissions as well as complete funnel analytics with Google Analytics, Google Ads and Meta Pixel. GTM provides opportunity to manage all of the tools that you require with the current marketplace in one easy to navigate layout.
If you haven’t set it up already, this would be a great time to get started!