PDF is an E-Files format developed by Adobe in 1993. Because of its significant features of accuracy, safety, efficiency and compatibility with cross-platform devices(including hardware and software platforms), It has become the ideal document format of digital information transmission for users to distribute and storage documents all over the world. And it has been widely used with the release and long-term storage of E-Files and digital publishing. PDF/A is specifically designed for the long-term storage of E-Files. Besides there are also PDF/X targeted at pre-printed data exchange and PDF/E at engineer designing field.
We have got in contact with all kinds of PDF files in our daily life. They can be identified originally by different platforms and systems, such as some foreign e-books, academic journals, and documents exchanged at work, etc. And we can set personal permissions, such as forbiddance of printing and copying, which is very flexible to us all. A PDF file may be encrypted for security, or digitally signed for authentication. What’s more, the widest application of PDF is on publishing. It varies from current layout technique where it supports the pre-press and printing and holds the independence of each PDF description page.
An PDF editor can usually give more than I wished in a world flooded with all kinds of PDF files. I have tried several tools by now on work occasions or school work occasions. Such as PDFfill.com, pdfescpe.com. And I found a new website recently: https://handypdf.com/ I can easily edit, fill and sign PDF forms online with it.
Anyway, an easily handled tool can always make life easier.