The PDF format has forced its way into being the platform-independent display format for clean-looking documents. Yet the 20-year-old file format also has a serious disadvantage: It's primarily a viewing and printout format and is not very useful for editing.

That means conventional editing programs have a difficult time, for example, extracting parts of the many magazines that exist in PDF format on the Internet to archive them. Even combining PDF files is a chore.

One remedy is the little Linux tool called PDF-Shuffler, which allows you to adapt PDF documents to your needs.

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