You want every new submission of your web form to automatically update the contact's lifecycle stage to “Lead” without the visitor having to make this selection. How should you set this up in HubSpot?

HubSpot lets a hidden form field pass a value into a contact property without requiring the visitor to see or complete that field. Lifecycle stage is a default contact property, and HubSpot states that it can be set through forms. This setup automatically writes the selected value to the contact record when the form is submitted. It is the correct approach when the visitor should not choose the value manually. It also keeps the form simpler while still standardizing the property update. HubSpot Knowledge Base