container check
Audit a GTM container.
See the third parties it can reach, what its custom code does, and where its measurement data goes.
No container ID? Enter a website instead — example.com — and we'll look for one.
How this works
A published container is a JavaScript file Google serves to every visitor, so it can be read without access to your GTM account. We fetch it, parse it, and report what it declares.
Auditing by container ID is exact and unlimited. Looking one up from a website is best-effort — some sites load GTM only after a consent choice, and some serve automated visitors a different page — so that lookup runs once per site per 24 hours.
Results for a container are kept and re-verified; nothing about the website you typed is stored. Read the documentation.