How do you convert a scanned document into a PDF format with annotations?

To convert a scanned document into a PDF format with annotations, you can use a PDF editor software like Adobe Acrobat, Foxit PhantomPDF, or Nitro Pro. These software allow you to scan a document and then add annotations to it, such as highlighting, comments, text boxes, and more. Once you have made the desired annotations, you can save the file as a PDF. Some scanning devices also come with the option to save the scanned document directly as a PDF file with annotations.