Free Online Image to PDF converter

Currently working on college applications and needed to convert a screen shot of my transcript in the PNG format to the PDF format.

A quick Google search led me to this site: Neevia Technologies -- Docupub.

Very quick, simple, and straightforward process:

1. Chose the output format (PDF), default compatibility, No rotation, and 300 resolution (default).
2. Chose the input file (after verifying that PNG's are acceptable with the handy "Supported File Formats" link).
3. Clicked the "Upload & Convert" button.

When it finished, got a link to the finished PDF file.  Clicked on it, it opened in the browser, and then saved it to the hard drive (using the built-in Chrom PDF saving options in the bottom right).

Simple and fast.  Immediately bookmarked the site (you can see the yellow star in the first screenshot) and will definitely use it again in the future!