Today, PDF is the most favored method for formatting ebooks. Aside from being compact, most people have a PDF reader installed on their computer. In addition, if you want to sell your ebook for a certain amount of money, the PDF format has a reliable method for creating digital locking codes.
Unfortunately, the software designed by Adobe to create PDF's can be very expensive. That said, there are some lower priced alternatives that you might want to take advantage of. Among other things, if you have access to the Linux operating system, you can find free programs that will convert documents into PDF format.
You may also be able to locate PHP, or other types of scripts that will run on a web hosting server. All you will need to do is install the script on a web page, and then use it to format your ebook. Because most scripts produced for Linux based servers come with open source licenses, you can probably use the script for free.
Finally there are a number of share ware programs available that will convert ebooks into a PDF format. Depending on your budget and needs, you may find one program more suitable than another. In many cases, a program that garners a great deal of attention as free ware will often have a price tag on it within a matter of days. Because the offering and price of these programs changes on a daily basis, it is best to do your own web search on the topic of PDF file makers. That said, chances are you can find a suitable program that will cost much less than the Adobe software products.