Quick PDF question

[JellyWorld]

If I have 3 PDF files how do I join then into one big PDF file? For example each PDF file contains one page and I want to join them into a three-page PDF.

 

[Seagull]

I've never really used a PDF file before, but could you copy + paste each of their contents into the first file?

 

[duffers20]

Think you might need to get a PDF writer, I think open office has support for writing pdf files, although not too sure about that

 

[Qonfused]

Are you opening the PDF's in Photoshop? If so, that's the only way you can do it (opening them one-by-one). If you download Adobe Reader (free), it'll all be in one.