How do I install a visitor ID tag on Google Tag Manager?
On Google Tag Manager, your visitor identification tag goes in: Tags > New > Tag Configuration > Custom HTML. The install itself takes minutes; the part that goes wrong on Google Tag Manager is below.
Where the tag goes
- Tags > New > Tag Configuration > Custom HTML.
- Paste your vendor’s tag snippet exactly as issued. Do not wrap it in extra script tags or reformat it.
- Publish or deploy, then verify (below) before trusting data.
What breaks visitor tracking on Google Tag Manager?
Code is automatically minified, converting single quotes to double quotes in the output.
How do you verify the tag fires?
Deploy a test tag and check browser DevTools console for tag execution logs.
Then run through the labeled QA checklist before you rely on the numbers, and set expectations with the match-rate calculator — no vendor identifies every visitor.