PDFsam, a desktop application to split, merge, mix, rotate PDF files and extract pages
You might wanna give PDFsam a try - the basic version is available for free and allows you to do what you want.
Versatile PDF creation and manipulation for Ruby
There are a variety of command line tools like HexaPDF and qpdf that can do this; however, they need to be used on the command line.
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HexaPDF to extract text from PDF file
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