Besides fax machine to help us on fax documents from a company to another company, Drop.io is another Web services that help us fax documents from internet to fax machines.

Drop.io before that is a file sharing service. The service provides you with a unique URL that you can share with friends and colleagues so that anyone can upload and share documents. Drop.io recently added the ability to send uploaded documents via fax. You can send Word, Excel, and PDF files to any fax number. The only limitation is that files cannot be more than 20 pages long, which is a vast improvement over other free online fax services like FaxZero, which will charge $1.99 per page for any document longer than three pages.

Besides that, you no need to signup for an account but just enter a folder name you want with password(Optional). After that upload your files and send to fax machines by entering the fax numbers, drop.io do not attach a cover sheet while if you want it, you have to put it inside your documents.