Track UTMs in Webflow Form

Add the generic script in Header 
 As shown here... 
 
 Go to your page and create HTML block in your form 
 add the following content in 
 <div style="display:none;">
 <input type="text" class="form-inputs w-input" name="utm_source" id="utm_source">
 <input type="text" class="form-inputs w-input" name="utm_medium" id="utm_medium">
 <input type="text" class="form-inputs w-input" name="utm_campaign" id="utm_campaign">
</div>
 
 as shown in the image: 
 
 You can add zapier integration and send all the data to Zapier when lead is submitted: