You can fax from a computer using your internet connection, a fax service, or fax software — no physical fax machine required
Faxing from a computer works through one of three routes: an online fax service that sends and receives through email or a web portal, fax software installed on your machine that connects to your modem or internet, or a multifunction printer with fax capability and scanning software. The method you choose depends on how often you fax, whether you need to receive faxes, and whether you already own the hardware. Most people find an online service the simplest option because it requires no installation and works from any device with internet access.
The document you want to fax must be digital or scanned. If you have a paper document, you need a scanner or a multifunction printer with a scanner built in. Once the document is in your computer as a PDF or image file, you can attach it to an email, upload it to a fax service, or open it in fax software and send it directly.
Key Takeaways
- Online fax services like Fax.com, eFax, and HelloFax let you send faxes through email or a web browser without installing software or owning a fax machine.
- Fax software installed on your computer can send faxes through a modem or internet connection, though it requires setup and works best if you fax regularly.
- A multifunction printer with fax and scanning capability lets you scan paper documents and fax them directly from the printer's control panel or your computer.
- You need a digital file (PDF, image, or document) to fax from a computer; paper documents must be scanned first.
- Online services typically charge per fax or a monthly subscription, while fax software and printer faxing may have no ongoing cost beyond the hardware.
Online fax services: the easiest route for occasional faxing
An online fax service is the fastest way to start faxing from your computer because you do not need to install anything or own special hardware. Services like Fax.com, eFax, and HelloFax assign you a fax number, then let you send faxes by attaching a document to an email or uploading it through their website. You log in, enter the recipient's fax number, attach your file, and send. The service converts your document and transmits it over the phone network to the receiving fax machine.
Most online services charge per fax sent (usually $1 to $3 each) or offer a monthly plan with a set number of faxes included. Some include a fax number so people can send faxes to you, which arrive as email attachments or appear in your online inbox. If you fax only a few times a month, pay-per-fax is cheaper than a subscription. If you fax regularly, a monthly plan usually costs less overall.
The main limitation is that you cannot fax directly from your computer's fax modem (if it has one) — you are routing the fax through the service's servers. This means you need an active internet connection, and the service stores a copy of every fax you send. If privacy is a concern, check the service's data retention policy before signing up.
Fax software: for regular faxing through your computer's modem
Fax software like Windows Fax and Scan (built into Windows 10 and 11), eFax Messenger, or Mighty Fax lets you send faxes directly from your computer using a fax modem or internet connection. If your computer has a modem (many laptops and desktops no longer do), the software can dial out and send the fax over the phone line without involving a third-party service. If you do not have a modem, some fax software can send through your internet connection instead.
To use fax software, you typically open the program, create a new fax, enter the recipient's number, attach or compose your document, and click send. The software handles the dialing and transmission. Windows Fax and Scan is free and comes with Windows; third-party software may cost $30 to $100 one-time or include a monthly subscription for online faxing features.
Fax software works well if you fax regularly and want to avoid per-fax fees or monthly subscriptions. The downside is that it requires a modem (which is becoming rare) or relies on an internet connection anyway, making it less of an advantage over an online service. If your computer does not have a modem, an online service is usually simpler.
Multifunction printers with fax capability
A multifunction printer (also called an all-in-one) combines printing, scanning, copying, and faxing in one device. If you own one, you can scan a paper document using the printer's scanner, then fax it directly from the printer's control panel or through software on your computer. The printer connects to your phone line or internet, depending on the model, and sends the fax without involving a separate service.
To fax from a multifunction printer, place your document in the scanner, open the fax function on the printer's screen or software, enter the recipient's fax number, and press send. Some printers let you fax from your computer by opening the document and selecting "Print to Fax" — the software routes it to the printer, which sends it. This works well if you already own the printer and fax infrequently.
The main cost is the printer itself, which typically ranges from $150 to $400 depending on quality and features. Once you own it, there are no per-fax fees. However, if you do not already own a multifunction printer and fax only occasionally, buying one just to fax is usually not worth the expense compared to an online service.
How to prepare your document for faxing
Before you fax, your document must be in digital form. If you have a paper document, scan it using a scanner, multifunction printer, or a smartphone app like Adobe Scan or Microsoft Lens. Save the scanned file as a PDF or image (JPG or PNG). If your document is already digital — a Word file, PDF, email, or photo — you can fax it as-is.
Check the file size before sending. Fax services and software usually accept files up to 10 to 25 MB, and most documents are well under that. If your file is very large (over 50 MB), compress it or split it into multiple faxes. Make sure the document is legible: if text is too small or blurry, the recipient may not be able to read it. Test by viewing the file at 100% zoom and confirming that all text is clear.
Organize multi-page documents in the correct order before faxing. If you are faxing multiple files, combine them into a single PDF using free tools like ILovePDF or Smallpdf, or send them as separate faxes if the service charges per document rather than per page.
Comparing cost and convenience across methods
| Method | Setup Cost | Per-Fax Cost | Monthly Cost | Best For |
|---|---|---|---|---|
| Online fax service | None | $1–$3 per fax | $10–$30 for 50–500 faxes | Occasional faxing, no hardware needed |
| Fax software (free) | None | None (if modem present) | None | Regular faxing with existing modem |
| Fax software (paid) | $30–$100 | None or $0.50–$1 per fax | $5–$15 for online features | Regular faxing with internet connection |
| Multifunction printer | $150–$400 | None | None | Frequent faxing and scanning, already own printer |
If you fax fewer than five times a month, an online service with pay-per-fax pricing is usually cheapest. If you fax 10 or more times a month, a monthly subscription (either through an online service or fax software) saves money. If you already own a multifunction printer, use it — there is no reason to pay for a separate service.
Troubleshooting common faxing problems
If your fax does not send, first confirm that the recipient's fax number is correct and that they have a working fax machine or service. Ask them to confirm they received it, because fax machines sometimes accept a transmission but the document does not print. If you are using an online service, check that your file uploaded successfully and that your account has enough credits or an active subscription.
If the recipient says the fax is unreadable or incomplete, the file may be corrupted or too large. Rescan the document or re-export it as a PDF, then try again. If you are faxing through a modem and the line keeps disconnecting, check that your phone line is working and that no other device is using it during the fax transmission. Some older fax modems conflict with call-waiting; disable it in your fax software settings if available.
For online services, if you cannot log in or your account shows no credits, contact the service's support team — they can usually resolve it within a few hours. Keep a record of your fax confirmations (most services email you a receipt with the date, time, and recipient number) in case you need proof that a fax was sent.
Frequently Asked Questions
Can I fax from my computer without a fax machine?
Yes. An online fax service or fax software sends the fax through the internet or a modem, so you do not need a physical fax machine. The recipient receives it on their fax machine or fax service, just as if it came from a traditional fax machine.
Do I need a phone line to fax from my computer?
Not necessarily. Online fax services send faxes through the internet, so you only need an internet connection. Fax software can also use the internet. A phone line is only required if you have a fax modem and want to send faxes directly over the phone network without using an online service.
What file types can I fax?
Most fax services and software accept PDF, JPG, PNG, and common document formats like Word and Excel. Convert your file to PDF if you are unsure — it is the most widely supported format and preserves formatting reliably.
How long does it take to fax from a computer?
Transmission usually takes a few seconds to a few minutes, depending on the file size and the recipient's fax machine. Online services may take a few minutes longer because the fax is routed through their servers. You typically receive a confirmation email within minutes of sending.
Is faxing from a computer find?
Online fax services store copies of your faxes on their servers, which introduces a privacy consideration. If you are faxing sensitive information, check the service's encryption and data retention policies. Fax software that uses your own modem or computer does not involve a third party, but the fax itself travels over phone or internet lines, which are not inherently private.