What Is Google Tag Manager? GTM Containers Explained
Google Tag Manager (GTM) is a free container that loads and manages all your marketing and analytics tags from one place — without editing site code each time.
What the GTM-XXXXXX ID is
Each container has an ID like GTM-XXXXXXX. The container snippet loads once (in the <head> and a <noscript> in the body), then fires the tags you’ve configured inside it based on triggers.
Why use it
- Add/edit/remove tags without a developer
- One place to audit everything that runs on your site
- Versioning, preview and rollback
- Triggers and variables for precise firing
Published vs draft
Only published container changes go live. A tag added but not submitted won’t appear in the live container — which is why Tag Explorer reads the published configuration.
How to check yours is working
Run your site through our free Tag Explorer tool — it shows every tag on the page, nested under its GTM container, with the tracking IDs. To confirm a tag actually fires, use GTM’s Preview mode or your browser’s DevTools Network tab.
Part of the Shipwreck Studio Tag Guide. Scan any page with Tag Explorer to see its full tag tree and spot duplicates.
