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How does a fax actually work?

A fax scans the page in black and white, transmits it as a signal over the phone network, and the receiving machine prints it out. Today you send the document over the internet to a service like mcpfax, which passes it on to the fax network.

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  1. 1 Document
  2. 2 Fax number
  3. 3 Send

No subscription · single fax €2.90 flat up to 10 pages · with credit from €1.00 · Delivery report by email

Step by step

  1. 1 Step 1

    The classic fax

    The machine scans the page in black and white, transmits it as a signal over the phone network, and the recipient's machine prints it out.

    The classic fax
  2. 2 Step 2

    Fax today via the internet

    You send a file or photo over the internet to mcpfax; from there the fax goes into the fax network to the receiving machine.

    Fax today via the internet
  3. 3 Step 3

    What that means

    Faxes are black and white. The connection up to mcpfax is encrypted; the transmission over the phone network itself is not end-to-end.

    What that means
  4. 4 Step 4

    Proof via transmission report

    The transmission report shows the result, date and time of the transmission, but not whether the fax was read.

    Proof via transmission report

The pictures are a simplified illustration. Menu names may differ slightly depending on the version.

Video transcript

How does a fax actually work? In short: the page is scanned, sent as a signal over the phone network and printed out again at the recipient's end. Let me show you how that works today without a fax machine. With a classic fax, the machine scans the page in black and white. The image is transmitted as a signal over the phone line. The machine at the recipient's end puts it back together and prints it out. Today, it works without a machine of your own. You send a file or a photo over the internet to mcpfax, from an AI chat or by email. From there, the fax enters the fax network and arrives like any other fax. This means a fax is always black and white, and colours become shades of grey. And the connection up to mcpfax is encrypted, but the transmission over the phone network itself is not end-to-end encrypted. At the end, it's clear whether all pages were transmitted. The transmission report shows this, with the result, date and time. It proves the transmission, but not that anyone actually read the fax. You'll find the link to mcpfax in the description. Subscribe to the channel for more step-by-step guides on faxing.

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Frequently asked questions

Why is a fax black and white?

Fax transmits pages in black and white; colours become shades of grey.

Is a fax encrypted?

With mcpfax, the connection up to the service is encrypted (HTTPS). The transmission over the phone network itself is not end-to-end encrypted.

Do I still need a fax machine today?

Not for sending. With mcpfax you fax over the internet from an AI chat or by email. You cannot receive faxes with it, though.

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