When you launch the program a menu will appear with all the functions of PDF Composer. You only have to choose those that you're interested in and a new window will appear with several options. All you will have to do is add the PDF file, and PDF Composer will modify it. You can handle the files in the following aspects: create a new PDF joining various pages in the order of your choice; divide an existing multipage PDF file, in as many PDFs as pages it has; join several files into a single one; extract a page from a PDF document; or reorganize the file's pages.
PDF Composer also has a few options to change the format of the PDF file. You'll be able to convert a PDF to JPEG, TIFF or GIF.
Download PDF Composer to be able to work with PDF files in a much more simple and comfortable manner.