The simplest way to fax from your computer

You can fax a document from your computer in three ways: through an online fax service (the easiest), through your printer if it has fax capability, or through your computer's fax modem if you still have a phone line connected. Most people use an online fax service because it requires no special hardware and works from any device with internet.

The process takes about five minutes. You upload the document, enter the recipient's fax number, and the service sends it. The recipient gets it on their fax machine just as if you had sent it from a traditional fax device. No phone line, no fax machine, no special software required on your end.

Key Takeaways

  • Online fax services are the most common method because they work on any computer with internet and require no hardware or phone line.
  • Your printer can fax directly if it has a built-in fax function and you have a phone line connected to it, though this is less common in newer printers.
  • You need the recipient's fax number (looks like a phone number) and a document in PDF, Word, or image format to send.
  • Most online services charge per page or offer monthly plans, though some offer a small number of free pages each month.

Using an online fax service (the most common method)

Online fax services like FaxZero, eFax, or HelloFax let you send faxes through a website or app without owning a fax machine. You create an account, upload your document, type in the fax number, and send. The service routes your document through the internet to the recipient's fax machine.

Start by choosing a service. FaxZero is free for up to three pages per month but shows an advertisement on the cover page. eFax and HelloFax charge monthly (usually $10 to $20) but include more pages and remove the ad. Search for "online fax service" to see current options and pricing, as these change frequently.

Once you pick a service, go to their website and create an account with your email and a password. Upload your document — most services accept PDF, Word documents, images, or scanned pages. Type the recipient's fax number in the format they request (usually with or without dashes). Review the preview, then click send. The service will confirm when the fax reaches the recipient's machine.

Faxing through your printer

If your printer has a built-in fax function and your computer is connected to a phone line, you can fax directly from the printer's control panel or through your computer's print menu. This method is less common now because most modern printers don't include fax capability, and fewer homes have dedicated phone lines.

To check if your printer can fax, look at the printer's physical buttons and screen. If you see a "Fax" button or option in the menu, it likely has the feature. You'll also need a phone cable connected to the printer's phone port and a working phone line. Place the document in the printer's scanner tray, select Fax from the menu, enter the recipient's fax number, and press send.

If you want to fax from your computer instead of the printer's panel, open the document you want to send, go to File > Print, and look for a "Print to Fax" or "Fax" option in the printer dropdown. Select it and follow the prompts to enter the fax number. Your computer will send the document to the printer's fax function, which then transmits it over the phone line.

Using your computer's fax modem (older computers only)

Older computers sometimes came with a fax modem — hardware that lets your computer send faxes directly over a phone line without a printer. This method is rare now because most computers no longer include modems, and phone lines are less common in homes.

If your computer has a fax modem, you'll see fax software pre-installed (often called "Fax and Scan" on Windows or "Fax" on older Mac systems). Open the software, create a new fax, attach your document, enter the recipient's fax number, and send. The modem will dial the number and transmit the document over your phone line.

This method requires a working phone line connected to your computer's modem port. If you don't have a phone line or your computer has no modem, this option won't work — use an online service instead.

What you need before you send

Gather these items before starting: the recipient's fax number (it looks like a phone number, often with 10 digits in the US), your document in a digital format (PDF, Word, image, or scanned page), and the recipient's name or company (helpful for the cover page). If you're using an online service, you'll also need an email address to create an account.

Make sure your document is readable. If you're scanning a paper document, use a scanner or your phone's camera to create an image or PDF. Test the image quality — the recipient should be able to read all text clearly. If the document is already digital (a Word file, PDF, or email), you can send it directly without scanning.

Understanding fax numbers and cover pages

A fax number is a phone number that connects to a fax machine instead of a person. It has the same format as a regular phone number — in the US, that's usually 10 digits (area code plus seven-digit number). When you send a fax, the service or device dials that number just like a phone call, but instead of connecting to a person, it connects to a fax machine and transmits your document.

Most online fax services let you add a cover page with your name, company, phone number, and a message to the recipient. The cover page is optional but helpful because it tells the recipient who sent the fax and why. Some services include a standard cover page automatically; others let you customize it or skip it entirely.

Troubleshooting common problems

If your fax doesn't go through, the most common reason is an incorrect fax number. Double-check the number with the recipient — even one wrong digit will cause the fax to fail. The service will usually send you a notification saying the fax couldn't be delivered.

If you're using a printer or modem and the fax won't send, make sure your phone line is connected and working. Unplug the phone cable from the printer or modem, plug a regular phone into that jack, and listen for a dial tone. If there's no dial tone, your phone line isn't active — contact your phone provider or use an online service instead.

If the recipient says they didn't receive the fax, ask them to check their fax machine's error log or call their provider. Sometimes faxes fail on the receiving end due to a broken machine or full memory. You can also ask the recipient for a different fax number if they have one, or use email as an alternative.

Frequently Asked Questions

Do I need a fax machine to send a fax from my computer?

No. Online fax services send your document through the internet to the recipient's fax machine, so you don't need to own one. If you use your printer or computer's modem, you do need a phone line, but not a separate fax machine.

What's the difference between faxing and emailing a document?

Faxing sends a document to a fax machine over a phone line or internet service; emailing sends it to an email address. Some businesses and government offices still require faxes because they're considered more legally find. If the recipient has a fax number but no email, faxing is your only option.

Can I fax from my phone instead of my computer?

Yes. Most online fax services have mobile apps for iPhone and Android. You can take a photo of a document with your phone's camera, upload it to the app, and send it the same way you would from a computer.

How long does it take for a fax to arrive?

Most faxes arrive within a few minutes. Online services are usually faster than printer or modem faxes because they don't depend on phone line quality. If a fax fails, the service will notify you and you can try again.

Is faxing through an online service find?

Most reputable online fax services use encryption to protect your documents while they're in transit. However, once the fax arrives at the recipient's machine, it's a physical piece of paper — anyone with access to that machine can read it. If you're sending sensitive information, confirm with the recipient that someone will be there to receive it when ready.