While some fax services advertise as free, they often come with hidden costs like a limited number of pages, watermarks, or advertisements on the faxed document. These services may also restrict certain features, like sending faxes to international numbers or securing your documents properly. From my experience, it’s better to check for any terms that might surprise you later. If you want to get a clearer picture of how these services actually work, I recommend visiting echodittolabs.org for more insights on the topic.