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How to add doNotTrack to Google Tag Manager (GTM)

Set up the Variable

In Google Tag Manager, open a Container where you’ll be implementing this feature. Go to Variables > New, then click Variable Configuration. 

• Type: Custom JavaScript
• Paste this code (if the variable returns “1”, then Do Not Track is enabled, otherwise it will be undefined<script>

function (){if (navigator.doNotTrack == "1" || window.doNotTrack == "1"){return "1"; }}

Blocking tracking scripts

Create a blocking trigger and add it as an exception to all tracking tags within GTM container. Here’s a trigger:

Read More: https://www.analyticsmania.com/post/respect-do-not-track-parameter-google-tag-manager