By Alexey Spasskiy · Published February 3, 2025 · Updated March 9, 2026 · 7 min read
Quick Answer: To receive a fax online, sign up for a virtual fax service (like mFax.to), pick a phone number, and set your delivery email. Incoming faxes arrive as PDF attachments — no machine, no phone line, no paper required.
Millions of businesses still send faxes every day — hospitals, law firms, banks, government agencies. If you need to receive one, you have two choices: buy a fax machine (plus a dedicated phone line), or spend two minutes setting up a virtual fax number that delivers documents straight to your inbox.
This guide covers every method to receive faxes online, how to choose the right number type, and how to keep incoming documents secure.
No More Missed Faxes
A physical machine can only receive one fax at a time — everything else gets a busy signal. A virtual number handles unlimited simultaneous incoming faxes with zero busy signals.
How Receiving a Fax Online Works
When someone sends a fax to your virtual number, here's what happens behind the scenes:
- The sender dials your number on their regular fax machine or online fax service — they don't need to change anything.
- Cloud servers answer the call and simulate a fax machine tone (the familiar handshake signal).
- The analog signal is digitized — the service captures every page and converts it to a PDF.
- You receive the PDF in your email inbox, in-app dashboard, or both — typically within seconds.
The sender has no idea the "machine" they're faxing is actually a cloud server. To them, it's just a standard fax.
Step-by-Step: How to Set Up a Virtual Fax Number
Sign Up for an Online Fax Service
Go to mFax.to and create a free account. You only need an email address — no credit card required to start.
Choose Your Fax Number
Select a local number (with a real area code like 212, 310, 415) or a toll-free number (800, 833, 844). If you serve clients nationally, toll-free looks more professional. If you have a local storefront or practice, a matching area code builds trust.
Set Your Delivery Email
Enter the email address where faxes should arrive. You can add multiple recipients — for example, your main inbox and a shared team inbox. Every incoming fax triggers an email with the PDF attached.
Share Your Number
Copy your new fax number and give it to anyone who needs to send you documents. Add it to your email signature, business card, website, or patient intake forms. You're ready to receive.
Receive and Manage Faxes
When a fax arrives, open the PDF attachment in your email — or log in to the mFax dashboard to view, download, forward, or archive every document. Your full history is searchable from any device.
Pro Tip: Portable Numbers
If you ever switch fax providers, check whether your number is portable. With mFax.to, you can port an existing fax number in so senders never need to update their records.
Fax Number Types: Which One Should You Get?
Local Number
Has a specific area code (e.g., 212 for NYC, 310 for LA). Looks familiar to local contacts.
Best for: Small businesses, medical offices, law firms with local clients
Toll-Free Number
Starts with 800, 833, 844, 855, 866, 877, or 888. No geographic limitation — nationwide coverage.
Best for: National companies, enterprises, anyone wanting a polished brand image
International Number
Numbers in other countries (+44 UK, +49 Germany, etc.). Lets overseas senders fax without international charges.
Best for: Global businesses, import/export, international healthcare
For most small businesses and individual professionals, a local number in their own area code is the right choice. It's the most familiar to clients and costs the same as toll-free.
Where Do Received Faxes Go?
Online fax services deliver incoming documents through three channels — most providers offer all three:
| Delivery Method | How It Works | Best For |
|---|---|---|
| Email (PDF attachment) | Fax arrives as an email with PDF attached | Most users — no extra app needed |
| Web dashboard | Log in at any browser, view full fax history | Teams, archiving, shared access |
| Mobile app | Push notification + PDF viewer on phone | Remote workers, on-the-go access |
With mFax.to, you get all three. If you're also sending faxes, check out our guide on how to fax from your computer or how to fax from email — same account handles both directions.
Can You Receive Faxes for Free?
Some services advertise free fax reception, but the details matter:
- Free trial: Most reputable services offer 7–30 day trials. You get a real number, test everything, and pay only if you keep it.
- Free inbound pages: Certain pay-as-you-go plans charge only for outbound faxes — incoming pages are free. This is ideal if you mainly need to receive faxes.
- "Free" with a catch: Completely free services often display ads, limit your storage, expire your number if inactive, or restrict you to a shared number (not portable).
Our best free fax services roundup compares the top options with honest tradeoffs.
Watch Out for Shared Numbers
Some free services assign you a shared fax number used by multiple people. Anyone on that service can see your incoming documents. Always verify you're getting a dedicated number for private correspondence.
Receiving Faxes Securely: What You Need to Know
Faxes often carry sensitive information — medical records, legal documents, financial statements. Security isn't optional.
Minimum Security Checklist
- TLS encryption in transit: Fax data should be encrypted from sender to server to your inbox
- AES-256 encryption at rest: Stored PDFs should be encrypted on the server
- Two-factor authentication: Protect your fax inbox like you protect your bank account
- Automatic deletion options: HIPAA requires you can purge records after a retention period
Is It HIPAA Compliant?
Receiving faxes with Protected Health Information (PHI) requires a HIPAA-compliant provider. The key requirements:
- Business Associate Agreement (BAA) — the provider must sign one
- Encrypted transmission and storage
- Audit logs — who accessed which document and when
- Access controls — per-user permissions, not shared logins
mFax.to supports HIPAA-compliant fax reception. For full details, see our HIPAA compliant fax guide and our comparison of best HIPAA compliant fax services.
Receiving Faxes on Your Phone
You don't need a computer to manage incoming faxes. With the mFax mobile app:
- Get a push notification the moment a fax arrives
- Open the PDF directly in the app — pinch to zoom, swipe between pages
- Forward the document to a colleague via email or messaging
- Download to your phone for offline access
- Reply by fax — tap "Send fax" to reply using the same number
This is especially useful for medical professionals, real estate agents, and anyone who's frequently away from a desk. For iPhone-specific setup, see how to fax from iPhone.
Receiving International Faxes
If you receive faxes from overseas senders, there are two options:
Option 1 — Your sender dials your number internationally. They pay their carrier's international calling rates. Works fine but can be expensive for the sender.
Option 2 — Get a local number in their country. For example, a +44 UK number means a UK sender pays a local call rate. mFax.to supports numbers in dozens of countries.
For detailed country-specific guidance, see our complete guide to international faxing.
Troubleshooting: Why Aren't My Faxes Arriving?
| Problem | Most Likely Cause | Fix |
|---|---|---|
| No fax email received | Email went to spam | Check spam/junk folder; whitelist the sender domain |
| Sender gets busy signal | Number not active yet | Wait 5 min after setup; contact support |
| PDF is blank or garbled | Sender's machine quality issue | Ask sender to resend; check their toner/paper |
| Fax arrived but no notification | Notification settings off | Enable email and push notifications in account settings |
| Delay longer than 5 minutes | High server load or VoIP issue | Usually resolves itself; contact support if persistent |
Test Before You Share
Always send yourself a test fax before handing out your new number. Use the free test fax feature in your mFax dashboard or ask a colleague to send a one-page test. See our guide on how to send a test fax for options.
Virtual Fax vs. Physical Fax Machine: Quick Comparison
| Virtual Fax (Online) | Physical Fax Machine | |
|---|---|---|
| Setup time | 2 minutes | 1–2 hours (machine + phone line) |
| Monthly cost | $5–$20/month | $30–$60 (line) + machine + ink + paper |
| Busy signals | None — unlimited simultaneous | Yes — one fax at a time |
| Storage | Cloud (searchable, unlimited history) | Paper (physical, bulky) |
| Access from phone | Yes | No |
| Works when office is closed | Yes, 24/7 | Only if machine is on |
| HIPAA compliance | Available | Requires additional measures |
| Document quality | PDF (lossless) | Analog (degrades over distance) |
The math is straightforward: virtual fax costs less, does more, and works from anywhere.
Get Started: Receive Your First Fax Today
Setting up a virtual fax number takes less time than reading this article. Open mFax.to, pick a number in your area code, and your fax inbox is live.
Your next incoming fax will arrive as a clean PDF — in your email, before the sender even hangs up.