Faxvio is a pay-as-you-go web fax service for sending faxes. You upload a PDF or a photo, enter the fax number, and see a black and white preview and the exact price before you send. It sends faxes only and does not receive them. It works in the browser on Windows, Mac, ChromeOS, iPhone and Android, and there is also an app for iPhone, iPad and Mac. You can sign in with Google, Apple or a 6-digit email code.
There is no subscription. The first page is free, once per email and per browser, and after that pages start from $0.18 each. Page packs run from 3 pages for $1.09 up to 57 pages for $9.99, pages never expire, and pages from a failed fax go back to your balance. Faxes can go to 37 countries and territories, up to 50 pages and 19 MB per fax.
Faxvio exists so people can send a fax from a web browser or phone without a fax machine or a subscription.