Thats very simple thises under the category of the 'merging PDF'. I personally use ClassicPDF editor to merge file. There is no as such limit on the number of files that you can merge. You can merge any number of files and it will work well for can also merge different formats together in one PDF file. If you have a regular use of it I would like to advise you to buy the whole version if you have a one time or limited usage then you should go for the free trial version of ClassicPDF. Here are the resource s for you that will help you outn