This question comes up a lot, and it makes sense — if you've never sent a fax before, it's natural to wonder whether the person on the other end needs some special equipment.
The short version: they need a fax number. That's it. What happens on their end when your fax arrives is their problem, not yours. You send to a number, the fax system handles the delivery.
What can a recipient use to receive a fax?
A physical fax machine
The classic setup. Their fax machine answers the call, receives the data, and prints it. Still common in medical offices, law firms, real estate agencies, and many small businesses. When you send to a number like this, the document arrives on paper within minutes.
A multifunction printer with fax capability
Most office-grade printers — Canon, HP, Brother, Epson — have fax built in. They work exactly like a standalone fax machine from the sender's perspective. The recipient just needs to have it connected to a phone line and switched on.
An online fax service
Increasingly common, especially in businesses that don't want a physical machine. They sign up for a service that gives them a fax number, and incoming faxes are converted to PDF and emailed to them. As the sender, you send to a regular fax number — you'd never know they're using a cloud service instead of a machine.
What if the recipient doesn't have a fax number?
Then you can't fax them directly. A fax requires a fax number at the destination — there's no way to fax to just an email address. If the person only has email, you'll need to send a PDF by email instead.
This is rare when faxing businesses and professionals — most that still accept faxes have a number listed. If you're faxing an individual person who gave you their fax number, you're good.
Can the recipient receive your fax on their phone?
Not by default — regular phone numbers don't accept faxes. But if they've signed up for a fax service that assigns them a fax number, incoming faxes are delivered to their email as a PDF. So in that sense, yes — they could open it on their phone in their email app. But it goes to a fax number first, not directly to a phone.
What about fax machines that are out of paper or switched off?
If the recipient's machine runs out of paper, your fax may be held in the machine's memory and print when paper is added. If the machine is switched off entirely, you'll get a "no answer" status and the fax won't go through. See our guide on what to do when a fax fails for next steps.
Does it matter what fax service you use as the sender?
No. Fax is a standardised protocol (the ITU T.30 standard) — any fax service or machine can communicate with any other, regardless of brand or country. You're not locked into a specific ecosystem. Send from sendfaxfast.com and it reaches a 1990s fax machine in a dentist's office just fine.
Common questions
Does the recipient need a fax machine to receive my fax?
Not necessarily. They can receive it on a physical fax machine, through an online fax service (which delivers to their email), or via a multifunction printer with fax capability. What they need is an active fax number. How that number is answered — machine, software, or cloud service — is entirely up to them.
Can I fax someone who only has an email address?
Not directly. Faxing requires a fax number on the receiving end. If the person only has an email address, they cannot receive a fax unless they sign up for an online fax service that gives them a fax number.
What if the recipient's fax machine is out of paper?
If the machine runs out of paper mid-print, the fax may still be stored in the machine's memory and print when paper is loaded. Some machines just drop the transmission. Either way, your delivery confirmation is not a guarantee — call to confirm for important documents.
Can a company receive a fax into email?
Yes. Many companies use internet fax services that convert incoming faxes to PDF and deliver them by email. Businesses with a fax number but no physical machine are almost certainly using this kind of service.