Using Hello Fax you can send 50 pages for free every month if you have a Microsoft account (Hotmail, Outlook email etc). You can send fax by uploading to selecting from many services like SkyDrive, Box, Dropbox, Evernote and Google Drive.
Just register an account (“Signup with Microsoft account)
Upload (or choose from SkyDrive, Box, Dropbox, Evernote and Google Drive.) files you need to sent
Enter fax number
Click “Send it now”
If you have Google account you can use that to get a similar account but for 6 months.