You don't need a fax machine or phone line to send a fax. The best online fax services allow you to send and receive faxes via your email address, a mobile app, or a web portal—and sometimes for free.

In the event you need to send a fax to someone, you may think that you'd need to buy an entire fax machine for yourself to do so, which can be a bit disconcerting since fax machines can be on the ...