Highlight & Annotate Your Documents Online

Bookgoo is a simple online collaboration tool that lets users highlight and annotate their documents online just like the way you'd mark up a piece of paper with a highlighter and discuss it with others.

To start, simply register for an account and upload your files to Bookgoo. Currently, it only supports formats such as PDF, HTML, DOC, XLS, JPG, GIF, etc. After inputting in your title and description, you can select whether you'd want it to be shared or private if you don't want others to view it.

At the editor, there is a zoom feature which you can zoom the document to view small details. Other key features include adding notes, pencil tool, color picker, email to friend, download it or add to groups for collaboration.