A-PDF Text Replace (http://a-pdf.com/text-replace/index.htm ) is a useful tool that allows you to replace, change and delete words in PDF. You can batch delete your unwanted words quickly instead of deleting them one by one manually. For more: http://a-pdf.com/faq/index.php?title=how-to-delete-specific-words-in-pdf-with-a-pdf-text-replace .