jpeg to pdf, 1:1 conversion

I have about 300 various jpeg files that I need to convert to pdf. I found many utilities where I could merge all of them to one pdf, but I didn't find any reliable 1:1 converting application. In theory, I could print those jpeg to pdf using pdf printer, but 300 is a lot to do this way. Anybody has a recommendation for such application? I tried FastStone Image viewer, but the pdf output...