# Track UTMs on Duda Websites

## UTM attribution overview

Duda UTM Tracking Integration only records UTMs that land on the checkout URL at purchase time. UTM Grabber keeps them in cookies on your site. This page explains how to pass that data through before the customer pays.

### What to expect

Duda sites can embed UTM Grabber script and pass params to forms.

### Steps

1. Add tracking script in Duda site header
2. Hidden fields on Duda forms

### Append UTMs with utm-out

```
<a href="https://your-checkout-url.example/product" class="utm-out">Buy now</a>
```

UTM Grabber rewrites the link with cookie values. Details: [utm-out class guide](https://docs.utmgrabber.com/books/102-getting-started-for-handl-utm-grabber-v3/page/appending-utms-to-the-buttons-using-class-name-attributes-selectively).

For webhook-based attribution after purchase, see [Send Duda UTMs via Webhook](https://docs.utmgrabber.com/books/duda-integration/page/end-uda-s-via-ebhook).