If you are got bulk of documents which you need to convert them to specific format in nice way, recommended app for you is CloudConvert which easy to use and if you got a cloud account which you would like your doc to be convert through without download and upload thing int your machine then this is great solution for you .

Step 1 : Visit the following link : https://goo.gl/WuFGbK

Step 2 :  Click Over Add to Chrome button 

Step 3 :  A pop up window with title Add “CloudConvert”? , Click over Add App button 

Step 4 :  The App will be install in Apps Bookmarks section in google chrome.