For many other reasons I use Neo Office instead of Microsoft Office. It's a free open source suite of programs from Sun Microsystems that does everything Office can and more. It reads and writes all the office file formats including the older ones from a time when Mac PowerPoint files were not compatible with PC PowerPoint files.... You get the idea. But one feature I rarely see mentioned is the extremely robust PDF export. So you can open a native .doc file (maintaining all the Microsoft formatting) and then export as a PDF with complete security, font, compression, and versioning control, none of which the generic printer PDF export does. The latest port is always at neooffice.org
So if you would like to convert Excel file to PDF, you may use this free and best Excel to PDF conversion tool. Enjoy.