Install SourceTag on Shopify

Add SourceTag’s tracking script to your Shopify store by editing the theme code. You’ll paste the script tag into your theme’s <head> section.

Step 1: Copy your script tag

In your SourceTag dashboard, go to your site’s detail page and copy the script tag. It looks like:

<script src="https://cdn.sourcetag.io/scripts/YOUR_SITE_ID/st.js"></script>

Step 2: Open the theme editor

In your Shopify admin, go to Online Store > Themes
Find your active theme and click the three-dot menu (⋯), then Edit code

Step 3: Edit theme.liquid

In the left sidebar, under Layout, click theme.liquid
Find the closing </head> tag in the file
Paste the SourceTag script tag on the line directly above </head>

<!-- SourceTag attribution tracking -->
<script src="https://cdn.sourcetag.io/scripts/YOUR_SITE_ID/st.js"></script>
</head>

Click Save

Step 4: Test

Visit your live Shopify store with UTM parameters:

https://yourstore.myshopify.com/?utm_source=test&utm_medium=cpc&utm_campaign=shopify-test

Open your browser’s developer tools (F12 or Cmd+Option+I on Mac) and check:

View page source to confirm the script tag appears in the <head>
Application > Cookies to confirm a _sourcetag cookie has been created
If you have a contact form or enquiry form on your store, submit it and check the notification for attribution data

Shopify forms

Shopify doesn’t have a built-in form builder in the same way WordPress does. Most Shopify stores use one of these for lead capture:

Contact page (pages/contact.liquid) - you’ll need to add hidden fields to the form. SourceTag detects the form and populates any matching fields on submission
Third-party form apps (JotForm, Typeform, etc.) - if the form renders as an HTML <form> element or iframe, SourceTag will detect it via MutationObserver
Custom Liquid forms - if you’ve built custom forms in Liquid templates, SourceTag detects those too

You’ll need to add hidden fields to whichever form you’re using. SourceTag doesn’t create fields - it only fills in fields that already exist. See Add Hidden Fields for the field names.

For checkout forms and order data, SourceTag tracks the attribution cookie but can’t add fields to the Shopify checkout (which is locked down). To pass attribution data into orders, you’d typically use a post-purchase webhook or Shopify Flow to read the cookie data.

Notes

This approach works on all Shopify plans that allow theme editing.
The script loads on every page of your store, including product pages, collection pages, and the cart.
Browser cookies are limited to 7 days on Shopify. There’s no server-side cookie option for Shopify sites. See Safari Cookies for details.
If you change or update your theme, you’ll need to re-add the script tag to the new theme’s theme.liquid.