Google Tag Manager
Google Tag Manager is a free Google tool that lets you place and manage tracking and marketing codes, known as tags, on your website from one place, without having to change your site each time.
- 3 min read
What is Google Tag Manager?
Google Tag Manager, often shortened to GTM, is a management system for tags. A tag is a piece of code that sends information to another service. Think of the code of GA4, the Google Ads conversion tag, the Meta pixel for Facebook and Instagram or a heatmap tool.
Without Tag Manager, every code has to be placed separately in your website. With Tag Manager you place a base code once, the container, and then manage all tags from within Tag Manager itself.
Tag Manager works with three components. Tags are the codes that send something. Triggers determine when a tag fires, for example on a page view or a click on a button. Variables are the data you send along or use in a trigger, such as the page URL or the text of a button.
Why it matters for your business
Good tracking is the basis for knowing what your marketing delivers. Tag Manager makes that tracking manageable. All codes are in one place, you see what is active and you can test changes before they go live.
It also prevents clutter. On many trade business websites there are codes from agencies that have not been worked with for years, duplicate tracking codes or pixels nobody uses any more. That slows down the site and pollutes your figures.
In addition, you handle the interplay with cookie consent in Tag Manager. Tags only fire if the visitor gave consent for them, and with Consent Mode Google tags get the right signal.
How Google Tag Manager works
You create an account and a container and place the container code on every page of your website. In WordPress that can be done via a plugin or in the theme. After that you work in the Tag Manager web interface.
If you want to measure when someone clicks your phone number, for example, you create a trigger for clicks on links that start with tel:. You attach a GA4 tag to it that sends an event, and a conversion tag for Google Ads. With preview mode you test whether everything fires correctly. Only then do you publish the change, and Tag Manager stores a version so you can always go back.
An example. Say a roofer has a website where, over the years, various parties have placed codes. The GA4 code is in the theme, an old Universal Analytics code in a plugin, a Facebook pixel in the footer and a Google Ads tag that only sits on the homepage. Nobody knows exactly what is measuring and what is not.
After the clean-up, only the Tag Manager container remains on the site. It holds GA4, the Google Ads conversions for forms and phone clicks, and the Meta pixel, all linked to the cookie consent. Every tag has a clear name, so anyone who looks in later sees straight away what it does. All the old loose codes have been removed. The tracking is correct and changes can from now on be made in a few minutes.
Common mistakes
The most common mistake is placing codes twice. A tag is in Tag Manager and also separately in the website, so everything is counted twice.
A second mistake is publishing without testing. A trigger that fires on every click instead of only on the submit button produces unusable conversion figures in one go. Always use preview mode.
Also often seen: no naming convention and no maintenance. After a few years there are dozens of tags with names like “Tag 1” and “test nieuw”. Nobody dares to change anything any more.
Finally, access often sits with one person or an old agency. Make sure you, as the owner, are an administrator of your own Tag Manager account.
How to approach it
Create a Tag Manager account in your own company’s name and give others only the access they need. Place the container on every page and remove loose tracking codes from your website.
Decide what you want to measure. For a trade business that is usually submitted forms, clicks on phone and WhatsApp, and possibly booked appointments. Build tags and triggers for those and give them clear names.
Link everything to your cookie banner and Consent Mode. Test every change in preview mode and write down briefly what you changed with each publication.
If you want to go further, then server-side tracking is the next step. We set up Tag Manager as part of conversion tracking and dashboards.
Frequently asked questions
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Is Google Tag Manager the same as Google Analytics?
No. Google Analytics, now GA4, collects and shows data about your visitors. Google Tag Manager is the system you use to place and manage the code for GA4 and other tools on your site. They often work together, but each has its own role.
Will Google Tag Manager slow down my website?
The container itself is light. What can slow your site down are the tags you put in it. By only using tags you really need and cleaning up old codes, the impact stays small.
Do I need technical knowledge for Tag Manager?
For simple measurements such as clicks on your phone number, a bit of explanation gets you a long way. For forms, cookie consent and conversions for ads, more knowledge is needed. A mistake in your tracking is often only noticed once you have already steered by it.
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