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I want to add (GTM) google tag manager in my Magento 2 store, but without installing any extension.

Please help me out that how I can add CTM manually.

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METHOD TO ADD GOOGLE TAG MANAGER TO MAGENTO 2 STORE

In Magento 2, you can easily add the Google Tag Manager without any need for a third-party extension.

To add Google Tag Manager to your Magento 2 store, all you need to do is add your unique Google Tag Manager code to your theme.

The Google Tag Manager code is divided into two parts – Script & NoScript.

You need to put these code snippets into two separate phtml template head and body files as shown below.

// YourTheme/Magento_Theme/templates/html/gtm_head.phtml

<script>..</script> <!-- GTM code -->

// YourTheme/Magento_Theme/templates/html/gtm_body.phtml

<noscript>..</noscript> <!-- GTM code -->

Now, we also need to load these files correspondingly through the default default.xml file.

<!-- YourTheme/Magento_Theme/layout/default.xml -->

<referenceContainer name="head.additional">

<block class="Magento\Framework\View\Element\Template" name="gtm.head" before="-" template="Magento_Theme::html/gtm_head.phtml" />

</referenceContainer>

<referenceContainer name="after.body.start">

<block class="Magento\Framework\View\Element\Template" name="gtm.body" before="-" template="Magento_Theme::html/gtm_body.phtml" />

</referenceContainer>

Your Google Tag Manager code is finally added and now you can set up your Google Analytics for monitoring and reporting of your Magento 2 store.

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Open your Magento Admin Panel and move to Content > Design > Configuration > Edit the Store View > Other Settings> HTML Head.

Paste the code you got from GTM for the tag here.

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You can easily add Google Tag Manager in Magento 2 without third-party extensions. All you need is to add the GTM code to your active theme. The GTM code is divided into two parts: script and noscript.

You need to put the GTM snippet into these two phtml templates for head and body:

YourTheme/Magento_Theme/templates/html/gtm_head.phtml

<script>..</script> <!-- GTM code -->

YourTheme/Magento_Theme/templates/html/gtm_body.phtml

<noscript>..</noscript> <!-- GTM code -->

To load the files correspondingly you should use the default .xml file:

YourTheme/Magento_Theme/layout/default.xml

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceContainer name="head.additional">
            <block class="Magento\Framework\View\Element\Template" name="gtm.head" before="-" template="Magento_Theme::html/gtm_head.phtml" />
        </referenceContainer>

        <referenceContainer name="after.body.start">
            <block class="Magento\Framework\View\Element\Template" name="gtm.body" before="-" template="Magento_Theme::html/gtm_body.phtml" />
        </referenceContainer>
    </body>
</page>

NOTE: You must run the deploy command after adding the above files

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The best way is to use some ready-made Magento 2 GTM extension, because if you just add Google Tag Manager (GTM) code to the HTML head, how would you like to integrate Google Analytics (GA), Google E-commerce Tracking, or Google Remarketing?

There are a lot of free and paid modules for that. So all you need to do is to install one:

  1. Magento 2 GTM Extension by WeltPixel - I used it a lot in the past, but it doesn't work with Google Analytics 4, so I recommend using the next one.

  2. Magento 2 Google Tag Manager Extension by Magefan - the best option for now as for me. It is also available on GitHub - https://magefan.com/magento-2-google-tag-manager.

  3. Magento 2 GTM Extension by Magepal - another option, if you don't like 2 previous ones.

So run these commands to get the GTM extension:

composer require magefan/module-google-tag-manager
bin/magento setup:upgrade
bin/magento setup:di:compile
bin/magento setup:static-content:deploy

After that navigate to your Magento 2 admin panel > Stores > Configuration > Magefan Extensions > Google Tag Manager and Analytics > Configure and enable the GTM.

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did you find a way to add the enhance e-commerce feature from ga4 using gtm to magento? in sales>google API > I add the tag but is not working the data layer

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