Are fax machines analog or digital?

Traditional fax machines are analog — they convert a scanned page into audio-frequency tones and send them over the Public Switched Telephone Network (PSTN). Modern online fax services like [mFax](https://mfax.to) are fully digital — they transmit documents as encrypted data packets over the internet.

Is digital fax more secure than analog fax?

Yes. Digital fax services encrypt documents with TLS and AES-256 during transmission and storage. Analog fax sends an unencrypted audio signal over a phone line, which can be tapped. For a deep dive, read our [guide to fax encryption](/blog/fax-encryption/).

How much does digital fax cost compared to analog?

Analog fax typically costs $500–$1,500 per year when you add up the phone line ($20–$40/mo), toner, paper, and maintenance. Digital fax services run $60–$400 per year depending on volume, with no hardware or consumable costs.

Can I receive analog faxes with a digital fax service?

Yes. When someone sends a fax from an analog machine to your digital fax number, the service converts the incoming signal to a PDF and delivers it to your email or app. The sender doesn't need to know you're using digital fax.

Do I need a phone line for digital fax?

No. Digital fax works entirely over the internet. You get a virtual fax number — no phone line, no hardware. See our guide on [how to fax without a phone line](/blog/how-to-fax-without-a-phone-line/).

Analog Fax vs. Digital Fax: Key Differences Explained

Analog fax uses phone lines and paper. Digital fax uses the internet and cloud storage. Here's how they compare on speed, cost, security, and convenience — and which one your business should use in 2026.

Frequently Asked Questions

Are fax machines analog or digital?: Traditional fax machines are analog — they convert a scanned page into audio-frequency tones and send them over the Public Switched Telephone Network (PSTN). Modern online fax services like [mFax](https://mfax.to) are fully digital — they transmit documents as encrypted data packets over the internet.
Is digital fax more secure than analog fax?: Yes. Digital fax services encrypt documents with TLS and AES-256 during transmission and storage. Analog fax sends an unencrypted audio signal over a phone line, which can be tapped. For a deep dive, read our [guide to fax encryption](/blog/fax-encryption/).
How much does digital fax cost compared to analog?: Analog fax typically costs $500–$1,500 per year when you add up the phone line ($20–$40/mo), toner, paper, and maintenance. Digital fax services run $60–$400 per year depending on volume, with no hardware or consumable costs.
Can I receive analog faxes with a digital fax service?: Yes. When someone sends a fax from an analog machine to your digital fax number, the service converts the incoming signal to a PDF and delivers it to your email or app. The sender doesn't need to know you're using digital fax.
Do I need a phone line for digital fax?: No. Digital fax works entirely over the internet. You get a virtual fax number — no phone line, no hardware. See our guide on [how to fax without a phone line](/blog/how-to-fax-without-a-phone-line/).