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Google Tag Manager

Custom HTML Tag

Learn about the Custom HTML Tag in Google Tag Manager. Discover how it works, implementation tips, and how Aimerce enhances data tracking via server-side methods.

Last updated: July 24, 2025Official Documentation

What is Custom HTML Tag?

The Custom HTML Tag is a commonly used tag within Google Tag Manager that allows marketers to inject custom JavaScript or HTML into your site.

Core Benefits:

  • Flexibility - Run scripts not supported by default tags
  • Advanced integrations - Connect with external platforms
  • Tracking pixels - Manually insert 3rd-party trackers

Client-Side vs Server-Side:

Traditionally, the Custom HTML Tag runs client-side via JavaScript, which can be blocked by browsers and ad blockers. Server-side GTM provides better data reliability, security, and performance.

How Aimerce Enhances Custom HTML Tag

Boost Custom HTML Tag with Aimerce's Enhanced Tracking

Aimerce leverages server-side GTM to ensure data is captured even in restrictive environments.

Aimerce's Enhancements:

  • Controlled environments - Run custom scripts server-side
  • Improved stability - Fewer frontend conflicts
  • Data validation - Sanitize inputs and reduce errors

With Aimerce, marketers gain up to 40% more accurate event tracking and faster attribution insights.

Improve Your Google Tag Manager with Aimerce

Get accurate, privacy-compliant tracking that goes beyond the limitations of traditional tools.

Learn More About Aimerce

Ready to Enhance Your Custom HTML Tag with Aimerce?

Get 10-40% more conversion data and better ad performance with server-side tracking that bypasses ad blockers and iOS limitations.