OneDrive with Office Online
OneDrive tops the list of document editing site online. And why not, its from Microsoft and they have integrated Microsoft Office online with OneDrive. Now you can create and edit document, excel sheets, power point presentation online regardless of the device you are working on. 15 GB of free storage to store your document, photos and share it with multiple people at once. What else you want?
All you need to do is sign up for an Microsoft account and use all the service for Free.
If you are looking for word document editor online then Google Docs is something you just can’t ignore. With Google Docs you can create new documents or edit the only already created on the web or any other device. You can also share documents with others and work at the same time on the same document at once. With Android app you can even get your stuff done without any internet connection. And as all this apps are cloud based so you don’t have to worry about loosing data- everything is saved automatically as you type.
PDFescape is an awesome tool to read, edit PDF documents online. The best thing about PDFescape is that you can even use this tool to fill form online which are in PDF format. Isn’t that amazing filling the PDF form online that doesn’t support editing. To know how to use PDFescape check out this much detailed post from cnet- How to fill out a PDF form without software.
PDF Buddy is another tool to edit pdf document on the go. PDF Buddy also allows you to fill from online without any hassle. It allows you to edit up to 3 pdf document for free every month. Its an cloud based application so you don't have to download or install anything to use the service whether you are from your PC, Mobile or Tablet. All you need is a working browser to use the service and edit PDF document online. The browser you are using right now will work just fine.