Unlimited file size to make a pdf or merge your existed pdf with this online tool.it's very easy.100%free.(No need to download any software in your pc/mac)
 
                  just keep in mind one thing before starting:-
     1.  After droop your all files(no matter total file size) please wait
         for a couple of minutes.
 
     2.   Now press MERGE button.(under your file)
 
     3.   File is ready to Download. just click on Download button.Done! 
 
     Click here: 

    Online pdf Editor:-
   Click here