Online Editors
There are a number of websites that offer free online editing software (see resources below). To use their services, you first upload your PDF file to the website's server. You can then edit it in your browser with the online editing software, and when complete, export it as a PDF and download it to your
computer. This method is helpful in a pinch, however since you have to upload a copy of your file to an unknown server, it is not advisable to use an online editor for sensitive documents.
Freeware PDF editors
You can edit a PDF file using free software written for this purpose. Sometimes the freeware PDF editors place restrictions on the free version, like file size or ability to print, so make sure whatever program you choose will do what you need it to do. Scroll down to resources for a couple freeware PDF editors.
Commercial software
If you edit PDF files on a regular basis, you may want to consider purchasing software that was specifically made for editing them. This software usually has a very intuitive interface, similar to a word processing program, that makes it very easy to edit PDFs. Some examples of commercial software for editing PDF files are InFix and Adobe Acrobat 9.
