Spire Free PDF Converter is an easy-to-use tool which will quickly create convert many file types to a PDF equivalent.
You can drag and drop Word Doc or DocX files, Excel spreadsheets, HTML documents, plain text files or any common image format onto the page, for instance, then one click will convert them to PDF versions.
You've an entire folder to process? No problem, drag and drop that onto Spire Free PDF Converter and it'll import all the files for you, and once again you can have them converted in a single click.
While this is all very straightforward, the program does have several limitations when compared to other PDF creation tools. You can't combine multiple files into a single PDF document, for instance. And there's no way to customise the output at all: no resolution options, no security, no image compression choices, nothing.
The authors do provide a Pro edition of the program with more features, however. This can add text or image watermarks to the output file, set permissions for copy, print, edit and other options, even password-protect the PDF file if necessary. It's priced at $29.95 and you can order from the e-iceblue site.
If you need to, say, convert individual images to PDF files then Spire Free PDF Converter is a very easy way to get the job done. It doesn't support many formats, though, or offer any configuration options for the PDF output, so for more general PDF creation use you'll be better off elsewhere