全球：免费收发传真

免费发传真较容易，免费收传真较难，因为免费收传真的成本较高，需要电话号码。

Though some people think that fax is in the past, it is not quite true. A lot of people and official organization use faxes as primary way of communication. When you use a fax not very often, there is no sense to buy fax machine or pay permanently for online services while you can use internet faxes for free. You can not only got free fax number and receive fax messages to it on email but you can send faxes as emails or using online forms as well.

免费发传真

faxzero.com
With this online app you can send internet faxes for free to anywhere in U.S. and Canada, You can submit Doc or Pdf file or paste plain text in online form. The drawback of this app is ad on the cover page and limits of maximum 3 pages per one fax document, maximum 2 faxes per day. You have to input valid email address because you need to confirm fax sending before it actually faxed out. In general it takes no more than 10 minutes to send a fax.

Tcp.int
This service you may use to send a fax to many locations around the world via email (via specific email address) or pasting plain text in online form. This service coverage is not limited to U.S. and Canada, there are also Australia, New Zealand, South Africa, China and more, The easy way to know available area for faxing is to check your number for coverage. If your number is covered it’s a perfect way to send faxes for free.
There also a couple of services which lets you make a shot by phone or digital camera and send it to fax.

Qipit.com
With this online app you can take a photo of your document (especially useful for whiteboards, business cards and handwritten notes) with camera or mobile phone, send it via email or MMS to your personal Qipit account and a clear and crisp digital copy of your document can be faxed out.

Scanr.com
Similar service to send a fax: just send photos of your document to doc@scanR.com and include the fax number in the subject or body of the message. You can also fax from the scanR.com website or the scanR mobile website at m.scanR.com.

免费收传真

K7.net
After simple registration on this amazing service you get a free phone number which enables you to have your faxes delivered directly to your email as multipage Tiff file. To look through pages you should use Shift+PageUp and Shift+PageDown in various image browsers. You also have the option to view faxes right on the K7 Web site. These two online services allows you to receive free faxes to non local number as email with pdf attachment.
刚刚试了k7.net，很好用。既可收留言，也可收传真。电话号码是在美国华盛顿州的。

Faxdigits.com
Faxdigits 已经完蛋了，不用试了。

efax.com
https://www.efax.com/en/intl/efax/signupFree
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以前用过efax.com，非常不稳定，有时根本收不到传真。


http://garmahis.com/reviews/free-internet-fax-guide/