Google Tag Manager on Blogger: Install Guide

How to install and configure Google Tag Manager on Blogger. Covers installation method, container setup, verification, and Blogger-specific considerations.

For general GTM concepts, see Google Tag Manager Overview

Overview

Blogger allows direct HTML editing of your theme, giving full control over where GTM is placed.

Prerequisites

A Google Tag Manager account with a Web container created at tagmanager.google.com
Admin access to your Blogger site
Your GTM Container ID (format: GTM-XXXXXXX)

Installation

Where to Add GTM Code

Theme → Edit HTML. Find <head> and add the head snippet after it. Find <body (the opening body tag, which may have attributes) and add the noscript snippet immediately after the closing >.

GTM Head Snippet

Add this in the <head> section:

<!-- Google Tag Manager -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-XXXXXXX');</script>
<!-- End Google Tag Manager -->

GTM Body Snippet

Add this immediately after the opening <body> tag:

<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXXXXX"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->

Replace GTM-XXXXXXX with your actual Container ID in both snippets.

Blogger-Specific Considerations

Blogger's template editor uses XML syntax. The GTM JavaScript snippet will work inside <script> tags, but the template parser may flag errors on && characters. If so, replace && with && in the noscript <iframe> URL (not in the JavaScript).

Template System

Blogger uses Blogger XML template with <b:section> and <b:widget> tags. When editing templates directly, note that the GTM JavaScript snippet (inside <script> tags) will not conflict with the template engine's syntax.

Verification

After installation, verify GTM is working:

GTM Preview Mode — In GTM, click Preview, enter your site URL, and verify the container loads.
Browser Console — Open DevTools (F12) and run console.log(window.google_tag_manager). You should see an object (not undefined).
Network Tab — Filter for googletagmanager.com and verify gtm.js loads with a 200 response.
Data Layer Check — Run console.log(window.dataLayer) to verify the data layer array exists.

Next Steps

Data Layer Setup — pass page and user data to GTM
GA4 Event Tracking — configure GA4 via GTM
Meta Pixel Setup — add Meta Pixel through GTM
Troubleshooting — debug tracking issues

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