Advantages of PDF and OCR
OCR:
When a scanned document is stored as an image, the text is not recognized beyond being a readable picture of the page. OCR is the process that produces text from that scanned image.
OCR makes a document editable, allowing it to be re-used in other applications such as MS Word, which saves re-typing time.
Accuracy of the OCR process ranges depending on the quality of the original paper document.