Print to PDF. Create PDF files easily from any Windows-based program.
Archive Using PDF/A. Create PDF/A documents which are fully compliant with current ISO archiving standards.
Set PDF Permissions. Control which users can read, print, edit, copy or comment your PDF files.
Reduce File Size. Keep your PDFs small with our compression options. Optimize file size for Web or print while preserving an appropriate level of quality.
Password-Protect your PDFs. You can restrict who can view, edit, copy, print or add comments to your document.
PDF24 Creator is much like the other programs in this list in that you can print any file to a PDF using any application that supports printing. In addition, you can also add files to the program manually if you don't wish to "print" to a PDF.
One thing I find that separates PDF24 from most of the other programs in this list is that if more than one file is open in the program at once, you can easily drag and drop them in a custom arrangement to produce a PDF with multiple pages, each page being a different file, which is very useful.
Some of the included features let you extract pages from a PDF, preview a PDF before creating it, change the quality of a PDF, choose a custom PDF standard, rotate pages, add document properties, password protect the PDF, deny permissions like print, edit, fill forms, copy text/images, and add/change comments, as well as use a text watermark, insert a signature, and choose the JPEG compression quality amount.
PDF24 Creator is free for business use and private use, so there are two separate (still completely free) downloads depending how you need to use the program.
Note: A fax service, called PDF24 Fax, is also included with this installation but it's not free to use.