What Is a Fax Machine? How It Works & Modern Alternatives
A fax machine sends and receives printed documents over a telephone line. Despite being a technology from the 1980s, faxing remains legally required in healthcare (HIPAA), legal proceedings, government filings, and real estate transactions in 2026. Understanding how it works helps explain why it persists and what modern alternatives exist.
How a Fax Machine Works
- Scanning — The machine scans the document line by line, converting it to a bitmap image
- Encoding — The image is compressed using Modified Huffman encoding
- Transmission — The encoded data is converted to audio tones and sent over the phone line
- Receiving — The receiving machine decodes the audio tones back into image data
- Printing — The image is printed on thermal or plain paper
The entire process takes 30 seconds to 2 minutes per page depending on image complexity and line quality.
Why Fax Machines Still Exist in 2026
| Industry | Why They Fax |
|---|---|
| Healthcare | HIPAA considers fax a secure transmission method. Medical records, prescriptions, referrals. |
| Legal | Court filings, signed contracts, legal notices often require fax confirmation. |
| Government | Many agencies still accept fax but not email for official submissions. |
| Real Estate | Signed offers, disclosures, and closing documents. |
Modern Alternatives to Fax Machines
- Online fax services (eFax, HelloFax, MyFax) — send/receive faxes via email or web portal. No physical machine needed.
- Phone fax apps — free fax apps for iPhone let you scan and fax from your phone.
- All-in-one printers — many modern printers include fax capability if you have a landline.
- Cloud fax services — enterprise solutions that integrate with email and document management systems.
Frequently Asked Questions
Do you need a phone line for a fax machine?
Traditional fax machines require a landline phone connection. However, online fax services and phone apps eliminate this requirement entirely by sending faxes over the internet. If you do not have a landline, an online fax service or phone app is the easiest alternative.
Is fax more secure than email?
Traditional fax over phone lines is considered more secure than standard email because the signal travels point-to-point over the telephone network and is not stored on intermediate servers. However, modern encrypted email (like ProtonMail) and secure file-sharing platforms are more secure than both. Fax's security reputation is partly regulatory inertia rather than technical superiority.