I know that there are tons of PDF converters out there that enables you to convert commonly used files to the popular .PDF format. One of the best PDF converters I've stumbled upon is FreePDFConvert.
FreePDFConvert is a free PDF conversion tool that helps you convert documents to PDF with support of over 70 formats such as HTML, JPEG, PPT, ZIP, TXT, PSD and many more. Of course, it has some downsides like limits for extracting tables from PDF documents to Excel and all images from PDF documents.
The best feature which this tool provides is that it lets users to zip their source files before converting their documents, hence it'll save precious time while uploading and converting. Besides uploading files from your hard disk, you can also grab them online by providing the URLs. Users can then received their converted PDF files via email.
Even though this service is free to use, however, if you want more great features such as no delay between conversions (if you're an impatient person who just can't wait), unlimited number of conversions per month, etc.