The user can, of course, turn to more advanced software, like Adobe Acrobat, but this program is very difficult to use, takes up a lot of system resources and it's also expensive. In this situation, using Adobe Reader, the default viewer for PDF files, would be useless. Let's suppose one needs to have a PDF file containing a single page of a large document. One of them is the impossibility to split and join more PDFs together. But despite its popularity, the PDF format has some drawbacks.
That's because PDFs can be read using a single small application, they are impossible to modify and also take up very little hard disk space compared to other formats.
Nowadays, PDF files are used by an increasing number of computer users.
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