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Tag

In GTM, a tag is a unit that defines 'what to execute'. When trigger conditions are met, tasks such as sending GA4 events, tracking Google Ads conversions, and calling Meta pixels are performed. Most marketing tools can be added without code using Google's official templates and community templates.

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In GTM, tags define 'what to do'. While a trigger determines 'when to execute' and a variable determines 'what value to hold,' a tag is an execution unit that executes the actual data collection code or transmits data to an external service. Representative examples include GA4 event tags, Google Ads conversion tags, Meta pixel tags, and custom HTML tags.

In addition to Google's official tag types, GTM has hundreds of third-party tag templates registered in the community template gallery. Meta Pixel, Naver tracking scripts, Kakao Pixel, Clarity, Hotjar, Mixpanel, etc. can be set in the GTM interface without code.

GTM location: Manage tags in the GTM interface (tagmanager.google.com). Select container → In the tag tab, you can check the list of all tags and the trigger/status of each tag. The minimum setup based on weballin is 1 GA4 configuration tag + GA4 event tag for each key event.

Key takeaways

  • It is the actual code execution unit among the three core elements of GTM (tag, trigger, variable).
  • In addition to Google's official templates, third-party tools can be added without code using community templates.
  • Each tag is connected to one or more triggers and fires when conditions are met.
  • The tag firing order is controlled by priority, and multiple tags can be connected to the same trigger.
  • In preview mode, you can visually check whether each tag fires and the execution order.

References

Frequently asked questions

What happens if I add too many GTM tags?

The more tags there are, the more scripts are executed when the page loads, which can affect Core Web Vitals such as LCP and TBT. Unused tags should be deactivated or deleted, and tags that do not require common execution on all pages should be triggered with specific page conditions. If more than 10 tags are running on all pages, consider switching to server-side tagging.

How do I check if a GTM tag actually fires?

Check tag firing in real time in the browser using GTM preview mode, and verify whether the event was actually collected using GA4 DebugView or Google Tag Assistant. Two-step verification is standard.

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