EasyPDF

EasyPDF is a very simple application that allows you to convert multiple image files to PDF. The supported file types include JPG, GIF, PICT, TIFF, PDF, TxT, and RTF.

To convert files, you just have to drag the files to the user interface and click on "Run". The program supports batch conversion, so you can load as many files as you want, and then convert them all simultaneously. When the process is complete, all the converted files will be saved in the same folder as the original files with the same name, so it's very easy to find them then. A good thing is that process is very quick, even if you convert multiple files at once.

Sadly, the program doesn't offer any customization options whatsoever and the user interface looks very plain. However, it is extremely easy to use, so it won't give you any trouble. If one of the files loaded has an unsupported format, the program will skip this file and continue with the next one.

In short, if you are looking for a very simple application to convert images and txt files into PDFs, EasyPDF may work for you.