Hello Everyone, In this tutorial, I am going to provide a sample code that explains you, how to break word while writing large sentence in visualforce  page when it's page property set "renderAs=PDF".
 
Break word in visualforce pdf 
 <apex:outputtext escape="false" style="word-wrap: break-all;" value="{!HTMLENCODE(Sobject Field Value)}"/>

Note: Don't forget to set standardStylesheets="false" in Visualforce page.

Hope you like this post, for any feedback or suggestions please feel free to comment. I would appreciate your feedback and suggestions.
Thank you.