PDFCool is a free online service that lets you convert JPG to a PDF format. All you need to do is upload the JPG file and it will be converted within a few seconds. It allows you to adjust settings, including page size and format, and you can split and merge files to make the conversion process easier. The program also allows you to create multiple PDF files from one single image.

PDFCool is a free application that lets you combine images and other elements into a single file. The best thing about it is that it allows you to merge as many images as you want, and it supports batch conversion. You can also combine elements by aspect, so you can easily find the best layout for your PDF. You can also work in batch mode so you can convert as many files as you like.

Another free option is HiHiSoft's free JPG to PDF converter. It's a standalone application with only 570 KB of storage space, and supports Windows Vista and Windows 8. It can convert single images as well as a variety of other formats. This software is easy to use and doesn't require Acrobat software. It also works with other image types, so you don't have to install any other software.