SharePoint RichText Boost provides an additional toolbar for SharePoint Rich Text editor. It extends the functions of default SharePoint Rich Text editor without replacing SharePoint Rich Text editor or creating a new column type. These new functions include:

Increase/decrease size of SharePoint Rich Text area without posting back. By default, users can’t adjust the size of SharePoint Rich Text area when editing an item; it is not convenient when users want to input large text or insert large images or tables etc. With SharePoint RichText Boost toolbar, users can freely increase/decrease height/width of the SharePoint Rich Text area. These operations are completed on the client side without posting back to server.