FaxZero is an online service that allows users to send faxes for free or for a fee, depending on the number of pages and destination. The service is accessible via its website, http://faxzero.com, where users can upload documents, enter fax numbers, and send faxes to both domestic and international numbers. Free faxes have limitations on the number of pages and include an ad on the cover page, while paid options offer ad-free transmissions and more pages. FaxZero aims to provide a convenient solution for individuals and businesses needing occasional faxing without subscribing to a dedicated fax line or service.