ORPALIS PDF OCR Free is a Windows tool which converts PDF files into fully searchable documents. It scans a PDF file and recognises all its text–even within images–and then exports a new PDF file that now has all its text searchable. This is useful with scanned documents, as it allows you to use the regular Search tool, rather than reading every page of the document.
ORPALIS offers a lot of useful tools for managing your documents. For example, the professional version converts over 90 document formats whereas the free edition supports only PDF as input. It also recognizes over 60 languages and uses multithreading to process multiple documents at the same time.