Some of these are online PDF editors that work right in your web browser, so all you have to do is upload your PDF file to the website, make the changes you want, and then save it back to your computer. Below, however, is a list of exactly what you're looking for. It's not easy to find a truly free PDF editor that lets you not only edit and add text but also change images, add your own graphics, sign your name, fill out forms, etc.
