How to Fax Without a Phone Line (The Modern Way)

By Alexey Spasskiy · Published December 7, 2024 · Updated June 8, 2026 · 6 min read

Quick answer: You don't need a landline to fax. The fastest method is an online fax service like mFax.to — upload a document, enter the fax number, and send from any phone or computer in under two minutes. No phone jack, no modem, no hardware.

Landlines are disappearing. Between 2004 and 2024, the share of US households with a landline dropped from 92% to under 25%. Yet faxing is still required by the IRS, hospitals, courts, and thousands of businesses.

The good news: fax and landlines were never permanently linked. Today, four practical methods let you send and receive faxes using nothing but an internet connection.

Why Traditional Faxing Requires a Phone Line

A standard fax machine works by modulating data into audio tones and transmitting them over an analog phone line — the same copper wire that carries your voice calls. That's why fax machines have a phone jack.

Internet fax services replace that copper wire with a broadband connection. You upload your document; the service's servers dial the recipient's fax number over the public switched telephone network (PSTN) and play the audio tones on your behalf. The recipient's machine never knows the difference.

Method 1: Online Fax Service (Recommended)

An online fax service is the cleanest solution. You get a dedicated fax number, a web dashboard, and the ability to send from any device — no hardware, no installation, no landline.

mFax.to is the fastest way to start. Over 5 million users have sent more than 2 million faxes through the platform, with a 98% delivery success rate.

How to Send a Fax with mFax.to

1. Open the app or go to mFax.to on any device.
2. Upload your document — PDF, DOCX, JPG, and most common formats are accepted.
3. Enter the recipient's fax number — include the area code for domestic; include the country code (e.g., +1) for international.
4. Add a cover page (optional) — type a short note directly in the app.
5. Tap Send — the service converts your file to a fax signal and transmits it.
6. Get a delivery receipt — a confirmation lands in your inbox once the recipient's machine accepts the fax.

What You Can Send

• PDF documents (contracts, medical records, tax forms)
• Word and Google Docs files
• Photos and scanned images (JPG, PNG, TIFF)
• Multi-page documents — combine them into a single fax with the merge PDF tool

Method 2: Email-to-Fax

If you already live in your email client, you can send a fax without opening a separate app. Most online fax services assign you an email address that acts as a fax gateway.

How it works:

1. Attach your document to an email.
2. Address the email to [fax number]@[provider domain] (e.g., 15551234567@send.mfax.to).
3. Hit Send — the service converts your attachment and transmits it as a fax.
4. Incoming faxes arrive as PDF email attachments in your inbox.

This method is especially useful for teams — anyone with an email account can send a fax without installing anything.

Method 3: Mobile Fax App

A mobile fax app turns your iPhone or Android phone into a complete fax machine. Snap a photo of a paper document, upload a PDF from Files, or use your camera to scan — then fax directly from the app.

Best for: individuals who fax occasionally and want everything in one app.

The mFax app is available on the App Store and Google Play and rated 4.8 stars across 5 million installs.

Steps:

1. Download mFax from the App Store or Google Play.
2. Open the app and tap New Fax.
3. Upload a file or tap Scan Document to photograph a paper document.
4. Enter the recipient's fax number and send.

For a full walkthrough, see the guide on how to fax from iPhone.

Method 4: VoIP Fax Adapter (Keep Your Physical Fax Machine)

If your office has a physical fax machine you're not ready to retire, a VoIP fax adapter (also called an ATA — Analog Telephone Adapter) lets you keep the machine while ditching the landline.

The adapter plugs into your router via Ethernet and has a phone jack on the other side for the fax machine. Your fax machine thinks it's connected to a phone line, but data travels over broadband.

Best for: businesses that need to keep a physical fax machine for compliance or workflow reasons, and want to eliminate the separate phone line cost.

This is more complex to set up than an online service and requires ongoing maintenance. For most individuals and small businesses, Method 1 or 3 is the better path.

Comparison: Which Method Is Right for You?

How to Receive Faxes Without a Phone Line

Sending is only half the equation. To receive faxes without a landline, you need a virtual fax number — a real 10-digit fax number hosted in the cloud.

When someone sends a fax to your virtual number:

• The call arrives at the online fax service's servers.
• The servers receive the fax and convert it to a PDF.
• The PDF lands in your email inbox or your app dashboard.

You can get a virtual number from your local area code, a toll-free 800 number, or an international number. For the full setup guide, see how to receive faxes online.

Porting Your Existing Fax Number

Dropping your landline doesn't mean losing your business fax number. Number porting transfers your existing fax number to an online service. After porting:

• Your existing number continues to receive faxes (now delivered digitally).
• You cancel the landline and stop paying the monthly fee.
• Clients, suppliers, and partners notice nothing — same number, same result.

mFax.to supports number porting for most US and Canadian numbers. Contact support to initiate the transfer before canceling your phone service.

Is Internet Faxing Secure?

Internet faxing from a reputable provider is more secure than a traditional fax machine, not less. Here's why:

• Traditional fax machines print documents in a shared tray that anyone nearby can read. There's no authentication, no audit trail, no encryption.
• Online fax services transmit documents via TLS encryption, store them with AES-256 encryption at rest, and deliver them to a password-protected inbox. mFax Business adds HIPAA compliance features, audit logs, and BAA agreements for healthcare organizations.

For sensitive documents — medical records, legal filings, tax forms — internet faxing is the safer choice.

Related Guides

• How to fax from a computer — Windows, Mac, and browser methods
• How to fax from iPhone — step-by-step with screenshots
• How to fax a PDF document — PDF-specific tips and file prep
• How to receive a fax online — virtual numbers and inbox setup
• How to fax from a printer — for multifunction printers with built-in fax

Send Your First Fax — No Phone Line Required

You don't need a landline, a modem, or a fax machine. All you need is an internet connection.

Try mFax.to — upload a document, enter a fax number, and send in under two minutes. Over 5 million users have already made the switch.

For business teams: mFax Business gives you virtual fax numbers, HIPAA compliance, team accounts, and a shared dashboard. Best of all, you build your own plan — dial in the exact seats and pages you need with a live calculator and pay only for what you use, with no rigid fixed tiers like most competitors. Plans start at about $9/mo.