Windows 7 Tip: 
FaxZero, A free fax services via IP that lets you fax PDF files and Word Documents to any fax machine around USA and Canada only. FaxZero prints an ad on the coversheet, but leaves the main pages uncorrupted (Ad-free faxes are about two bucks). FaxZero services has limitation whereby one day you can send twice only and each time faxes with maximum three pages only.
According to their policies, FaxZero has a no tolerance policy for spam and will not share your fax numbers or email address with any other parties.If you need to send a fax and do not have access to a fax machine, try out FaxZero!
FaxZero (Via – Digital Inspiration)
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http://www.GotFreeFax.com is another website that lets user send free fax online to the US and Canada. User can either upload a PDF/Word file or enter text to fax. Plus, it does not add Ads to user’s fax, which makes it suitable for faxing formal documents.