CMS has a nice option for creating online forms that are submitted directly through websites but many people have PDF forms on their sites. Many of these are documents that can only be viewed online and must be printed and filled out manually. A better approach is to make forms that can be filled out easily online and that are tested with assistive technology. National Center on Disability and Access to Education (NCDAE) has some excellent cheat sheets to get you started with Universal Design of documents.
Making PDF Forms FillableInstructions for converting existing electronic documents into forms with Adobe 9