Docdroid is a free web service that will help you to convert documents into many file formats and share with others. It will supported PDF, DOC, ODT, PAGES, RTF, OTT, XLS, XLSX, TXT, PPT, PPTX, and ODP formats. No sign up is required for using it.
You can simply upload your files into docdroid after upload your files you will get a link this will used for share files with others. You can view the uploaded file in your browser. You can provide password protection to the file. The uploaded files will delete after 60 day if you want before it allow you to delete file. Docdroid provides direct link to twitter and email.