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  2. Google Tag Manager
  3. Custom HTML Tag
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.

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