DOC, DOCX, PPT Viewer for Google Drive is a tool that allows you to view office files (Word, Excel, PowerPoint) directly in your web browser.
You can choose a office file to view from Google Drive. and support connect with Google Drive.

This app makes Word, Excel, and PowerPoint documents viewable in a web browser using Office Online. 
Word and PowerPoint documents must be less than 10 megabytes. Excel must be less than five megabytes.