GTM Custom Templates (Community Gallery) Explained

A Custom Template tag is built from a template in GTM’s Community Template Gallery — vendor-built, sandboxed tags you can add without writing code (Microsoft Clarity, TikTok, Reddit and many more are distributed this way).

Why they look generic

In the published container, gallery templates get an internal function name like __cvt_MQDKZ that’s unique to that container — so the vendor isn’t obvious at a glance.

How we identify them

Tag Explorer fingerprints each template by its distinctive configuration parameters (and confirms against vendor code in the container) to name common ones like Clarity and TikTok, with their IDs. For any it can’t place, the Details button reveals the template’s parameters so it can be identified.

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.