Xodo PDF Reader & Annotator - is a Pdf file that has large potential and broad functionality. In addition to the reading files of an application so as can, leave a mark, to write directly into the document the various annotations and leave comments. The application is equally fast and works flawlessly both on the tablet and the phone. Complex files and large documents, the application displays quickly and without major hitches. There is an automatic sync with Dropbox and Google Drive.