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It is now no need to install a software for managing PDF files. With an online service called LoopApps, you can combine many pdf files, can convert TXT, RTF and DOC etc. to PDF, can transfer PDF files from url adresses, and even sign electronically without taking an account.

When you take an account, you get much advanced features like changing page formation. If you are studying on PDF files frequently, rather than installing softwares to every computer, it can be sensible to use free service LoopApps.