If you drag a PDF to the Win2PDF Desktop icon, or select a PDF from the open window when launching the Win2PDF Desktop application, the following options will be displayed under the "File" menu:
Win2PDF Desktop - Make PDF Searchable
After selecting "Export -> PDF - Searchable (OCR)", you will be prompted to save the searchable PDF file. If the option is grayed out, you need to download the "Win2PDF Desktop with OCR" setup program from:
Win2PDF will recognize text from images and graphics using Optical Character Recognition (OCR), and will save the text information in an invisible text layer to make the PDF searchable.