SourceTag

Form Setup

Set up SourceTag with Instapage

Instapage’s landing page builder includes a form editor that supports hidden fields. You add one hidden field per SourceTag data point and set the field name to match.

What you need

  • SourceTag installed on your Instapage landing page (added via Instapage’s JavaScript settings)
  • An Instapage landing page with a form

Step 1: Add SourceTag to your Instapage page

  1. In the Instapage page builder, go to Settings > JavaScript (or Custom Code)
  2. In the Head section, paste your SourceTag script tag
  3. Save

[IMAGE: Screenshot of Instapage JavaScript/Custom Code settings with SourceTag script added]

Step 2: Open the form in the Instapage editor

  1. In the Instapage builder, click on your form element to select it
  2. Click Edit Form Fields (or double-click the form)

[IMAGE: Screenshot of Instapage builder with form selected and Edit Form Fields option]

Step 3: Add hidden fields

  1. Click Add Field (the ”+” button)
  2. Set the field type to Hidden
  3. Set the Field Name to the SourceTag field name (e.g. st_fc_channel)
  4. Leave the default value empty
  5. Repeat for each field

[IMAGE: Screenshot of Instapage form editor showing hidden field type being added]

Core fields (add these)

  • st_fc_channel
  • st_fc_detail_1
  • st_fc_detail_2
  • st_fc_detail_3
  • st_fc_detail_4
  • st_lc_channel
  • st_lc_detail_1
  • st_lc_detail_2
  • st_lc_detail_3
  • st_lc_detail_4
  • st_fc_landing_page
  • st_lc_landing_page

Optional extended fields

If you have enabled extended field groups in your SourceTag dashboard, also add:

  • st_fc_click_id and st_lc_click_id (click IDs)
  • st_visits (visit count)
  • st_days_to_convert (days since first visit)
  • st_device (device type)

[IMAGE: Screenshot of Instapage form editor with all hidden fields added]

Step 4: Verify field names

Click on each hidden field and check the field name in the properties panel. The name must match the SourceTag field name exactly, including case and underscores.

[IMAGE: Screenshot of Instapage hidden field properties showing the field name]

Step 5: Publish and test

Publish your Instapage page. Visit it with UTM parameters:

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

Submit the form. Check the lead in Instapage’s Analytics > Leads section. The hidden field values should appear alongside the visible field data.

[IMAGE: Screenshot of Instapage lead details showing populated hidden fields]

Tips

  • You can copy field names from the Fields page in your SourceTag dashboard (each name has a copy button).
  • Instapage includes hidden field data in all integrations (webhooks, email notifications, CRM connections).
  • If you are using Instapage’s built-in A/B testing, add the hidden fields to all page variations.
  • Instapage also has its own UTM tracking. SourceTag’s hidden fields provide the full attribution picture (first-click, last-click, visit count, etc.) which goes further than basic UTM passthrough.