How to Fax with no Fax machine

Hello everyone
I wonder if is there a secure, reliable and easy way to use internet (aka phone or web browser) to send fax to ancient companies that don’t like to upgrade
Although they have all customers info online

Im seeing a bunch of apps for iPhone but not sure whether to use them pay for them or not
Thank you

The oldest “web fax”… the one I remember existing back before the first Internet bubble burst is efax. The logo is still the same, so I assume they’re still the same company. It’s no longer freemium though, and looks pretty expensive, certainly for a one off. I recall @mikahsargent talking about this on a recent iOS Today show… but it was on the live channel and I don’t follow the show. I do recall him saying it was expensive for a one off and he ended up getting a subscription.