Optical character recognition (OCR) - recognition of text from images, to extract text from scans or images and then be able to to edit it. Search volumes indicate that PDF is really a universal format in many areas of electronic document management, although interest in PDF readers is gradually declining, as users prefer to use one app for both reading and editing. Offline PDF software have more extended functionality and even additional plugins. In terms of user demand, PDF editors prove to be the most popular among PDF software, due to the fact that modern editors contain all editing and convert functions. Online applications are easily accessible and support making small changes to documents. Programs of this type vary in the functionality: from tools that only convert, to solutions combining the functionality of all three categories. Pdf converters allow to convert files of other formats to PDF or vice versa. Pdf editors, as a rule, require more free space, as they contain many editing tools - to read, to modify, to add password, to create new document, etc. This is convenient for plain book reading and/or document view. Pdf readers are the small programs that can only display the contents of a file. Difference between PDF reader, PDF editor and PDF converter PDF files are popular in business environment, as managers can encrypt content, assign user roles or prohibit content editing. Documents may contain media, such as images and videos, without having their structure damaged. This format allows to work with texts, create interactive survey forms and templates. pdf extension initially is a private development by Adobe Systems, which received the status of an international ISO format and became publicly available in 2008. pdf files are very popular for electronic document management, because the pdf-format is more flexible than others. PDF editors allow users to create and edit content, modify media, change structure, etc. These are special programs intended to provide editing options for documents in PDF format.

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