To Automatically Detect PDF Fields from the Scanned Document, you have to Install a PDF writing program that has a feature to identify PDF fields to your computer. After that, Launch PDFill and open the scanned PDF document that contains the fields you want to identify. You need to click the “Tools” menu. You must pick the “Delete, Flatten, List and Fill” option that will open a separate window. Then, Click the “List all PDF Form Fields” button. You should Click the “Save As” button that will open a separate window. You can Use the “Save in” menu to select a folder in which to save the PDF. You have to Click the “Save” button.