Google Tag Manager puts one small script on your website. After that, every tracking tag you want to add, change or remove happens in a dashboard instead of in your code.
That is the whole pitch, and for most sites it is a good one.
What you get
- Changes without a developer. Adding a conversion tag stops being a ticket and a deployment. For a marketing team, this is the difference between measuring something this week and next quarter.
- One script instead of six. Every tag loaded directly is another request slowing the page down. Loading them through one container is usually faster, though only if you keep the container small.
- The usual tags out of the box. GA4, Google Ads, Meta Pixel and most others have ready-made templates. No code to paste wrong.
- A preview mode. You can see exactly which tags fire on which page before anything goes live. This alone saves more time than the rest combined.
- More than one person can work in it. Useful when marketing and development are different people, which they usually are.
Getting started
Create a container, put the two snippets on your site, and add tags one at a time. Before each tag, be clear on what you are trying to measure and why. A container full of tags nobody can explain is worse than no container at all.
Use preview mode every time. Publish only when it does what you expected.
The part people skip
Consent. A tag in GTM fires on page load unless you tell it to wait. If your cookie banner and your tags are not connected, you are tracking people before they have agreed, and the banner is decoration.
We wrote up the two-minute check for that, because it is the single most common thing we find on sites that believe they are compliant.
Housekeeping. Containers rot. Tags for campaigns that ended two years ago keep firing. Once a year, open it and delete what is dead.
If you would rather it was set up properly once than fixed later, we do that.
Builds websites and the systems behind them for small businesses in Spain and the Netherlands. Writes down the things clients ask twice.
