Online faxing (also known as Internet fax, digital fax and eFax) utilizes an online fax service provider to convert a fax transmission into file that can be received via email or a fax machine.

Online faxing has become a necessity for the day to day operations of businesses as it's more affordable, convenient, efficient, reliable and environmentally friendly compared to the old-fashioned fax machines .

Here are five sites that you can use to send your fax online.

1. eFax

2. Fax

3.  Srfax

4. Smartfax

5.  FaxLogic