PDFaid – Tools for Watermark and PDF Conversions
http://pdfaid.com/

PDFaid provides a series of pdf tools to help you make amazing and useful changes to your pdf files Online. These tools do not require you to install any software on your computer. The interface is easy and intuitive to use. The tools are free with a fee based service for files larger than 400KB. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.