can-pandoc-add-google-tag-manager

Short answer: Pandoc can include Google Tag Manager (GTM) code, but you have to handle it through custom templates.

Pandoc itself doesn’t know or care about GTM—it just builds documents. But if you’re generating HTML with it, you can totally insert GTM into the head and body sections by editing the template it uses.

✅ How to add Google Tag Manager to Pandoc output:

1. Get your GTM code

GTM gives you two chunks:

One <script> that goes in the <head>
One <noscript> iframe that goes right after the opening <body>

2. Use a custom Pandoc HTML template

You can download the default template with:

pandoc -D html > custom.html

Then edit custom.html:

Insert the `<script>` in the `<head>` section:

<head>
  $if(title)$
    <title>$title$</title>
  $endif$
  <!-- GTM HEAD CODE -->
  <script>(function(w,d,s,l,i)...</script>
</head>

Insert the `<noscript>` in the `<body>` section:

<body>
  <!-- GTM BODY CODE -->
  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXX"
  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>

  $body$
</body>

3. Use your custom template when converting:

pandoc input.md -o output.html --template=custom.html

Boom—GTM is now baked into every page you render.

⚠️ Heads up

Make sure you don’t double-encode the JS when pasting into the template.
If you’re generating static sites with Pandoc, you’re on your own for managing analytics, so GTM like this is your best bet.
If you’re using a static site generator like Hugo or Eleventy instead, they have more flexible ways to insert scripts.

If you're trying to keep it minimal but still want analytics, you could also look into lightweight GTM alternatives like Plausible or Fathom.