Xodo Docs

The app offers smooth navigation and PDF viewing tools, together with features for editing documents, highlighting sections or underlining text. You can automatically sync PDF files with various cloud storage solutions, including Dropbox, Google Drive and OneDrive.
 
You can also open other types of text documents and save them as PDF. The app lets you annotate PDFs with others in real time or take notes on blank PDF documents. Aside from this, you can use the app to organize multiple documents, set bookmarks or print files easily. It lets you crop pages, manage tools in the reading mode and switch between PDF documents using tabs. You can also add arrows, lines, merge and split PDF files inside the app.