Why is it recommended to add a custom pixel for Google Tag Manager instead of inserting the script?

Technical Q&A

Topic summary

A user is setting up Google Tag Manager (GTM) and questions why custom pixels are recommended over direct script insertion into head and body tags. They’re concerned about potential risks like duplicate data while aiming to track granular customer behavior (page scrolls, button clicks, input field activation) in Google Analytics.

Response clarifies:

  • For ecommerce tracking specifically, custom pixels with GTM configuration are recommended to properly capture events and event data
  • No inherent risk exists in implementing GTM snippets directly in theme files
  • For the user’s specific tracking needs (scroll %, button clicks, link clicks), placing GTM script directly in the theme file and triggering events is a viable approach

The distinction appears to be use-case dependent: custom pixels for ecommerce event tracking versus direct implementation for general behavioral tracking.

Summarized with AI on October 27. AI used: claude-sonnet-4-5-20250929.
1

Hi

I’m trying to set up GTM (Google Tag Manager) on my store and just learned that it’s recommended to add a custom pixel for GTM instead of inserting the script directly. Is there a risk inserting the code on the head and body tags as instructed in GTM page? (e.g., any issue of duplicate data?)

I aim to analyze granular customer behavior on Google Analytics, using GTM (e.g., page scroll %, button click, input field activation, etc.)

Thanks!

2

Hi jbshop1,

Thanks for your query,

For ecommerce tracking it is recommended to configure custom pixel and configure GTM script to get the events and event data.

There are no risk to implement GTM snippet on the theme file.

as you are looking for tracking custom events (scroll %,button click,link click ) you can place the GTM script on theme file and trigger the event.

Feel free to ask if you have any questions.

Thanks

1 Like