FaxZero.com - Just plain works.

Yea, I know...there's a ton of free fax services out there, but of all I've tried, I probably like this the best. I rarely send FAX's, but when I do need to, this is what I use. It's quick, super easy and just plain works.

From the Site FAQ:

About FaxZero.com: "FaxZero lets you send a fax to any fax machine in the United States (including Puerto Rico) or Canada for free. You don't need a fax machine yourself, but you do need a valid e-mail address."


Q: How can you provide this service for free?
A: The service is supported by advertising on the web site and on the cover pages of the free faxes you send. We have a partnership with the good folks at Metro Hi Speed, who provide us with a great deal on Internet fax services.
Q: How does it work?
First fill out the fax form. Be sure to include your valid e-mail address and carefully type the Confirmation Code. (This simply helps us weed out abuse of the system.) Type the text of your fax or attach a file, then click the Send Free Fax Now button.
Next, a confirmation message will be sent to your e-mail address. Click the URL in that message. Your fax won't be transmitted until you do. (If you are using a spam filter, please add support@faxzero.com to your friends list first, otherwise you will not get the email from us and your fax will not be sent.)
We'll then attempt to deliver your fax. You'll receive an e-mail message to let you know when it's delivered. Or if it can't be transmitted for some reason, an e-mail message will tell you that.
Q: What type of documents can I send?
The easiest way to send a fax is to just type or paste the text of your fax into to the Enter Text to Fax box. Or, you can click the Browse... button to fax a file on your computer: you can send a PDF, Microsoft Word (.DOC or .DOCX or .RTF) file, or Excel spreadsheet (.XLS or .XLSX).
If you attach a file, any text in the Enter Text to Fax box will be ignored.
Q: Tell me about the ad on the cover page.
A: It's not really an ad, just the FaxZero logo at the top of the page. There is no FaxZero logo on the $1.99 premium fax. The cover page does not count as part of the 3- (for free) or 15- (for premium) page limit.