FaxFair guidesPublished November 2, 2026

Can you fax without a phone line?

Yes, you can fax without a phone line by sending online, from a fax website, a phone app or an email to fax service. A standard fax machine still needs one, though an internet phone (VoIP) line can stand in, and Epson says it can't guarantee faxing over VoIP.

In our reading, online fax works because the service's own fax equipment dials the number for you. To receive faxes without a line, you need a fax number from an online fax service.

Which fax setups need a phone line

From each maker's or service's own pages, read November 2, 2026.

Five ways to send a fax, whether each needs a phone line, and what can go wrong
Setup	Phone line needed	What can go wrong	Source
Fax machine on a landline	Yes, a standard analog phone line	Some office phone systems (PBX), and splitters or DSL routers between the wall jack and the machine, can stop it working	Epson user's guide
Fax machine on internet phone service (VoIP)	Yes, with the VoIP line in place of a landline	Voice compression and lost data packets can spoil the fax, and Epson says it can't guarantee faxing over VoIP	Cisco; Epson user's guide
Fax website	No	The number you send to has to be a fax line. FaxZero says that when you enter a voice number, its system tries 5 times before giving up	eFax; FaxZero FAQ
Fax app (FaxFair, our iPhone app)	No	The same last step. In FaxFair, a fax can fail if the line is busy, no fax machine answers or the number isn't a fax line	FaxFair
Email to fax service	No	You need an account with the service, as eFax requires	eFax

Faxing online without a phone line

A fax website, a fax app and an email to fax service work the same way. Your phone or computer sends the file over Wi-Fi or mobile data, and the service's fax equipment dials the number. As eFax puts it, online fax services "use the internet instead of a traditional phone line."

FaxZero, a free fax website, says you need a valid email address but no fax machine. As of November 2026, its home page lists free faxes of up to 3 pages plus a cover page, up to 5 a day.

On faxfair.com you upload PDFs or photos in a browser on a computer or a phone, type a US or Canadian fax number and pay. You don't need an account. As of November 2026, a fax of up to 40 pages costs $2.49, and we only charge your card when the fax is delivered.

To send pages on paper, use FaxFair, our iPhone app, which scans them with the camera and faxes them without a computer.

Our guide on how to fax without a fax machine has the steps for each way.

Need to send a fax today without a phone line? This website faxes your PDFs or photos to a fax number in the US or Canada. For paper pages, the FaxFair iPhone app scans them with the camera.

Send a fax online

Using a fax machine on internet phone service (VoIP)

A fax machine has to plug into something that behaves like a phone line. Epson's user's guide for its WF-C878R printers says the fax works on standard analog lines and office PBX systems. It may not work on VoIP lines such as DSL or fiber-optic digital service. It may also fail with a VoIP adapter between the wall jack and the printer.

Another Epson user's guide page says fax machines "are designed to work over analog phone lines." It adds that "Epson cannot guarantee that fax transmission will work when using VoIP."

In our understanding, phone service from a cable company is usually VoIP too. Xfinity's tips for fax machines on its Xfinity Voice service, for example, include a setting to improve sending over an IP network.

The deeper problem is that internet phone service is built for voice. Cisco's guide for its voice gateways says G.729 and other high compression codecs "are not optimized for fax." It adds that fax signals usually don't pass through them correctly. Networks usually get around this in one of two ways. They pass the fax tones through a codec with little or no compression, such as G.711. Or they use fax relay, which ITU Recommendation T.38 describes. Relay stops the tones at a gateway and sends the page across the network as data.

Our explainer shows how T.38 links two fax machines across an IP network.

Lost packets still hurt. On Cisco's own fax relay, error correction mode (ECM) has "a low tolerance" for jitter and packet loss, about 2 percent. Cisco says fax reliability "is increased greatly with ECM disabled," even with packet loss of about 10 percent. It also warns that "it is not reasonable to expect fax relay to work reliably" when the network appears to be lossy. In our reading, the maker settings below follow the same idea, since most of them slow the fax down or turn ECM off.

If your line comes from an adapter box, check its fax setting too. Grandstream's HT80x adapters offer a Fax Mode of "T.38 (Auto Detect) FoIP by default" or "Pass-Through." For pass-through, its guide says to use the PCMU or PCMA codec. If errors keep happening, Canon's advice is to contact the company that provides the line.

Fax machine settings for VoIP lines

Menu names are as each page prints them, and your model's menus may differ.

Settings that makers and one phone provider suggest for VoIP lines and for fax errors
Maker or provider	Setting	What it does
Brother (MFC-L2750DW)	Settings, then All Settings, then Initial Setup, then Compatibility, then Basic(for VoIP)	Cuts the modem speed to 9,600 bps, from 14,400 at Normal, and turns off ECM. Unless interference keeps coming back, Brother says "you may prefer to use it only when needed"
Canon (one online user manual)	On the control panel, Settings/Registration, then Function Settings, then Auto Adjust Communication Speed When Using VoIP. In Remote UI, Settings/Registration, then Send, then Settings for Communication Speed When Using VoIP, then tick Auto Adjust Communication Speed When Using VoIP	Canon says to set it "to send and receive faxes more reliably over a VoIP network." It also says administrator privileges are required
Epson (one user's guide)	Fax Speed set to Slow(9,600bps)	Epson's fix for communication errors; its page doesn't tie this setting to VoIP. For color faxes, Epson says to make sure the error correction mode (ECM) setting is turned on
Xfinity Voice (phone service)	Lowest baud rate, ECM off or at its lowest, and Fax Speed Adjustment at Medium	Xfinity also says call waiting and voicemail "interfere with receiving faxes," so turn them off on a fax line

Fax machines that fax by email (I-Fax)

Some fax machines can also send and receive faxes over the internet as email. Brother's Internet Fax (I-Fax) sends faxes as email messages with TIFF-F files attached, in black and white only. To reach an ordinary fax number, Brother's relay broadcast has one Brother machine pass the internet message on over "conventional telephone lines."

The ITU's recommendation for store-and-forward fax over the internet is T.37, first dated June 1998.

Receiving faxes without a phone line

To receive a fax, you need a fax number that something answers, and without a line that has to be an online fax service. For example, eFax says you get "your unique fax number for sending and receiving faxes over the internet" when you sign up. Our guide to what a fax number is explains how fax numbers work.

As of November 2026, on faxfair.com you can get a US fax number online for 7 days ($4.99), 30 days ($9.99) or 1 year ($59.99). We email each fax sent to it to you as a PDF. If a fax is over 10 MB, you get a link to your inbox page instead. The FaxFair iPhone app sells numbers at the same prices, with faxes arriving in the app, and neither kind renews by itself.

Questions

Can you fax over Wi-Fi?

Yes, from a phone, tablet or computer on Wi-Fi, using a fax website, a fax app or an email to fax service. The service makes the call. A standard fax machine is different. Epson's guide for its WF-C878R printers, for example, lists only phone lines and office phone systems for the fax.

Can a fax machine work with VoIP?

It can, but Epson says it can't guarantee faxing over VoIP. Brother and Canon have settings made for VoIP lines, and Epson suggests a slower fax speed when faxes hit errors. If those don't help, ask your phone provider whether its service supports fax.

Do I need a landline to receive faxes?

No, you don't need one. An online fax service can give you a fax number that receives faxes over the internet. With eFax, for example, faxes can arrive in your email, and a number you buy in the FaxFair app receives them in the app.

Can I fax from my cell phone without a landline?

Yes. A fax app or a fax website on your phone sends the fax over mobile data or Wi-Fi, and the service dials the fax number. Our guide on how to fax from an iPhone has the steps.

Sources

The pages we read for this guide.