How to Install Google Tag Manager (GTM) on Your ASP Website

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Jon Monk
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Adding Google Tag Manager (GTM) to your ASP website allows you to manage all tracking and marketing tags in one place. This is particularly important for complying with Google Consent Mode 2.0 and keeping your analytics setup clean and flexible.

This step-by-step guide walks you through checking for existing tags and safely installing GTM on your ASP-powered website.

Related Reading:

 

 

Step 1: Check If GTM Is Already Installed

Before installing GTM, it's essential to check your site for existing tags. Installing GTM twice can lead to data duplication or tracking issues.

How to check:

  1. Install the Tag Assistant Chrome Extension:
    Tag Assistant – Chrome Web Store

  2. Visit your website and click the Tag Assistant icon in your browser.

  3. Tag Assistant will show a list of all active tracking tags, including:

    • Google Tag Manager (GTM)

    • GA4

    • Google Ads

    • Meta Pixel, and others

📷 Screenshot example:

Tag Assistant.jpg

Important: If GTM is already installed, do not proceed. Speak to your analytics team or developer first to avoid conflicting installations.

If you see other hardcoded marketing tags, consider migrating them into GTM for better control and Consent Mode compliance.
See: Understanding Cookie Compliance: Why It Matters & How It Affects Your Data

 

 

Step 2: Get Your GTM Code Snippets

  1. Log in at tagmanager.google.com

  2. Select your GTM container (or create a new one).

  3. Click Admin > Install Google Tag Manager

  4. You’ll be given two code snippets:

    • One for the <head> section

    • One for immediately after the opening <body> tag

Copy and save both snippets for the next step.

📷 Screenshot example:

installgtm.jpg

 

 

Step 3: Add the GTM Code to Your ASP Website

Use ASP’s built-in Third-Party Code tool to insert the GTM snippets.

Add the first snippet (to the <head> section):

  1. Log in to your ASP CMS.

  2. Go to:
    Settings > Site Settings > Third Party Code

  3. Click Add Third Party Code and fill in the fields:

Field Value
Title Your GTM Reference: GTM-WHH2CCBL
Third-party Code Paste the first snippet here
Code Description Google Tag Manager
Category Analytics
Location Before head end
Content This third-party code is not restricted

  1. Click Save.

📷 Screenshot example:

Site Settings.jpg

 

 

Add the second snippet (to the <body> section):

  1. Click Add Third Party Code again.

  2. Use the following values:

Field Value
Title Your GTM Reference: GTM-WHH2CCBL
Third-party Code Paste the second snippet here
Code Description Google Tag Manager
Category Analytics
Location After body start
Content This third-party code is not restricted

  1. Click Save.

 

 

Step 4: Confirm GTM Is Installed Correctly

Once installed, go back to your GTM container to test it.

  1. In GTM, click Preview

  2. Enter your website URL and click Connect

  3. Your website will open in a new tab

  4. Return to Tag Assistant and confirm that GTM is firing as expected

📷 Screenshot example:

Final Test.jpg

 

 

 

You're All Set

Your ASP website is now running Google Tag Manager. You can now use GTM to add tracking tags like:

  • Google Analytics 4

  • Meta Pixel

  • LinkedIn Insight Tag

  • Google Ads Conversion Tracking …and many more, all in one place.

This approach is essential for maintaining compliance with cookie consent rules and improving tag performance.

 

 

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