Google PDF Viewer is a free solution provided by the tech-giant which helps you open and view PDF files on your Android smartphone and tablet. This simple application is also available inside Google Drive, but now it can be used as a standalone tool as well. The workspace is very clean and intuitive. Towards the upper part of the screen you will notice the search function which can be used each time you want to find text inside your current PDF document.
You can easily select text using gestures and copy it to other applications if you desire so. A big plus for this software is its lightweight design which makes it work even on slower devices. You can use the built-in printing feature to print pages for your PDF files. Another simple functionality is the ability to zoom in on a specific part of the page.
As it was mentioned already, Google PDF Viewer is optimized both for Android smartphones and tablets.