CIB PDF Brewer is an easy and entirely free PDF editor.
What differs it from the other converters is its capacity to modify the PDF files which have been already converted. With this program, you can have a document which is in conformity with the original and without data loss. In order to personalize your documents, it lets you include images, links, and use fonts of your choice. Your documents can be protected by password and sent by e-mail via interface.
CIB PDF Brewer can be configured to fit your needs and API is available to add other features.