Some free PDF editors are AbleWord and DocHub, as of 2015. AbleWord is a word processor with PDF editing capability. Users can open a PDF file with this program, make changes to it and save the changed file. The software is compatible with Windows XP, Vista, 7, 8 and 10.
DocHub is an online PDF editor with a wide range of annotation tools that let users add and highlight text, stamp, draw and insert images. It also allows users to merge PDF files by appending one file to another. To use this editor, users need to sign up for a free account or sign in with their Google or Dropbox accounts.