If you want to create pdf file freely and without watermarks, you can use PrimoPDF.
By using PrimoPDF, you can create five types of pdf file such as Screen: Larger files, photo retain high quality for printing; eBook: Medium files for web and office. Images are compressed; Print: Larger files, photo retain high quality for printing; Prepress: Largest files, preserve source image quality if possible; and Custom..

If you choose Custom, you can mange the color such as Color, Grayscale and Mono. If you choose Color, next you can manage the Downsampling such as No Downsampling, Average, Bicubic and Subsample; and you also can choose Convert CMYK to RGB for On-Screen Viewing. If you choose Grayscale, next you can also manage the Downsampling such as No Downsampling, Average, Bicubic and Subsample; If you choose Mono, next beside you can manage the Downsampling such as No Downsampling, Average, Bicubic and Subsample, you also can manage compression, such as CCITT Fax Encode, Flate Encode and Run Length Encode.

In PrimoPDF, you also can Document Properties such as Title, Author, Subject and Keywords.

For the security reason, you also can add password to your PDF file; And you also can add Permission to your PDF files such as Require a password to change security settings and access specific functions; Enable copying of text, images and other content; and Enable text access for screen reader devices for the visually impared.

You can download PrimoPDF from http://www.primopdf.com/download.aspx