To combine multiple PDF files in a single PDF file you can try the Merge PDF Tool. which is the safe and best software to use without facing any problem. download the free demo version of this tool and combine PDF files securely. This utility is compatible with all versions of PDF documents. This Software does not require any technical knowledge to run. Visit here for more details: http://www.mergepdf.pdfchamp.com/
bryanjordan
Free Merge PDF Tool