The short answer
Partly. Between your browser and Faxturbo the file is protected by HTTPS. The last stretch, between our system and the recipient's fax machine, travels across the telephone network, and the fax protocol offers no encryption.
That limit applies to every fax provider. The security page lists what we do and what you can do to reduce the exposure.
Two legs, two levels of protection
The first leg runs from your device to our servers over HTTPS, which encrypts the upload and the pages you see. The second leg is the call to the recipient's fax number, using the standard fax protocol.
That protocol was designed before modern encryption and offers none. It is a property of fax itself, not of a given provider.
Reducing the risk
Most real incidents come from human factors: a mistyped digit, a machine in a hallway, a tray nobody empties. Double-check the number and ask the recipient to be at the machine for sensitive documents.
For very sensitive content, consider a channel that is encrypted end to end, and keep the fax for cases where the recipient requires it. A delivery receipt confirms where and when it arrived.
Receipts are described in the receipts question.
Key points
- Upload protected by HTTPS
- The telephone leg of a fax is not encrypted
- This applies to all fax services
- Check the number and warn the recipient for sensitive documents