SourceTag

Form Setup

Set up SourceTag with HTML Forms

If you’re using a custom HTML form (not a form builder plugin), add hidden input elements directly to your form’s HTML.

What you need

  • SourceTag installed on your site
  • An HTML <form> element

Add hidden inputs

Add <input type="hidden"> elements inside your form tag. One for each SourceTag field.

<form action="/submit" method="POST">
  <!-- Your visible fields -->
  <input type="text" name="name" placeholder="Your name" required>
  <input type="email" name="email" placeholder="Your email" required>
  <textarea name="message" placeholder="Your message"></textarea>

  <!-- SourceTag hidden fields (core) -->
  <input type="hidden" name="st_fc_channel">
  <input type="hidden" name="st_fc_detail_1">
  <input type="hidden" name="st_fc_detail_2">
  <input type="hidden" name="st_fc_detail_3">
  <input type="hidden" name="st_fc_detail_4">
  <input type="hidden" name="st_lc_channel">
  <input type="hidden" name="st_lc_detail_1">
  <input type="hidden" name="st_lc_detail_2">
  <input type="hidden" name="st_lc_detail_3">
  <input type="hidden" name="st_lc_detail_4">
  <input type="hidden" name="st_fc_landing_page">
  <input type="hidden" name="st_lc_landing_page">

  <!-- SourceTag hidden fields (optional) -->
  <input type="hidden" name="st_fc_click_id">
  <input type="hidden" name="st_lc_click_id">
  <input type="hidden" name="st_visits">
  <input type="hidden" name="st_days_to_convert">
  <input type="hidden" name="st_device">

  <button type="submit">Send</button>
</form>

Leave the value attribute empty. SourceTag’s script finds these fields by their name attribute and fills in the values automatically.

Test

Visit the page with UTM parameters:

?utm_source=test&utm_medium=cpc&utm_campaign=html-test

Open your browser’s developer tools (F12) and inspect the hidden fields before submitting. You should see values populated by SourceTag.

Submit the form and check your server/email for the attribution data.

Tips

  • The name attribute must match exactly. Copy field names from your SourceTag dashboard.
  • Hidden inputs are not visible to visitors.
  • This works with any server-side handler (PHP, Node, Python, etc.) that processes POST form data.
  • For AJAX forms, make sure you serialise all form fields including the hidden ones.