Many PDF Editor support this. I recommend getting a application to do this because it tends to have features that you may need after you combine the multiple PDF into one. For example, you may need to delete some pages, organizing the pages, or adding a new page for a table of content.
JPG files in different formats can be made into a single PDF file with no problem. Let me say, the conversion of one JPG file into two PDFs is not an issue. Just a simple matter of changing the bit-depth. If you have an extra large image you cannot convert into two PDFs, then you have two JPG files. The conversion must be a one-to-one mapping. If you have to convert JPG files into PDF files, then it is good for you to convert all available JPG images into PDF files. If your printer is capable of converting multiple JPGs into PDF files, then the conversion process becomes a little more easy. The conversion may or may not work with a very large image. If it does not, then it is usually because the content of your book is too small to print with a single printer. How to.