You can fax from your computer using free online services, your email, or built-in operating system tools — no fax machine or phone line required.

The simplest free route is an online fax service that accepts documents through a web browser. You upload a PDF or image file, enter the recipient's fax number, and the service sends it. Services like FaxZero, eFax Free, and HelloFax offer limited free faxes per month — typically 3 to 5 — with no credit card required. If you fax infrequently, this covers most needs.

If you fax regularly or need more than a few per month, email-to-fax gateways let you send unlimited faxes by attaching a document to an email and sending it to a special address. Pamfax and MyFax both offer free tiers with this feature. The trade-off is that free plans usually add a watermark to outgoing faxes and may not include a fax number for receiving.

Key Takeaways

  • Online fax services like FaxZero and eFax Free let you upload a document and send it to any fax number with no software installation, though free accounts are limited to 3 to 5 faxes per month.
  • Email-to-fax services let you send faxes by attaching a file to an email, which works well if you already use email regularly and need to send more than a few faxes.
  • Windows and Mac both have built-in fax software that works if you have a modem or internet connection, though setup requires a few extra steps.
  • Free fax services add watermarks to documents and may not let you receive faxes, so check what the free tier includes before you start.

Using an Online Fax Service (Fastest Method)

Online fax services are the quickest way to send a single fax without installing anything. Go to the website, upload your document, and send it in under two minutes. The document must be a PDF, image file (JPG, PNG), or Word document. If you have a paper document, scan it first using your phone camera, a scanner app, or a physical scanner connected to your computer.

FaxZero is the most straightforward: visit faxzero.com, click "Send a Fax", upload your file, enter the recipient's fax number and your email address, then click send. You get 3 free faxes per month with no account creation. The fax arrives within minutes. eFax Free (efax.com) requires you to create an account but gives you 5 free faxes per month and a fax number you can use to receive faxes. HelloFax (hellofax.com) offers 1 free fax per month but includes digital signature tools if you need to sign documents before sending.

The main limitation is the monthly cap. Once you hit your limit, you either wait until next month or pay per fax (usually $1 to $3 each). If you only fax a few times a year, this is not a problem. If you fax weekly, you will need either a paid plan or a different method.

Sending Faxes Through Email

Email-to-fax gateways let you send a fax by attaching a file to an email and sending it to a special fax-number address. This works well if you are already in your email and want to avoid logging into another website. The process is straightforward: compose an email, attach your document, and send it to an address like 5551234567@fax.pamfax.com (where 5551234567 is the fax number you want to reach).

Pamfax (pamfax.com) and MyFax (myfax.com) both offer free email-to-fax sending. With Pamfax, you create a free account, then send emails to [fax-number]@fax.pamfax.com. The fax arrives within minutes. MyFax works the same way but requires you to set up the email address in your account first. Both services add a watermark to free faxes, so the recipient sees "Sent via [service name]" at the top or bottom of the page.

Email-to-fax is best if you send faxes regularly but do not need a fax number for receiving. If you need to receive faxes, you will need a paid plan or a different service.

Using Windows Fax and Scan

Windows 10 and Windows 11 include a built-in fax tool called Fax and Scan that works if your computer has a modem or internet connection. This method is free and does not require any third-party service, but setup takes a few extra steps.

Open the Start menu, type "fax and scan", and click the app. Click "New Fax" in the toolbar. A compose window opens where you can add a cover page, attach a document, and enter the recipient's fax number. Click "Send" and the fax goes through your internet connection or modem. The fax arrives within minutes.

The catch is that Fax and Scan requires your computer to have a modem or to be set up with an internet fax service. Most modern computers do not have a built-in modem, so you may need to configure an internet fax account first. If you do not have a modem, use an online service instead — it is faster and simpler.

Using Mac's Built-In Fax Feature

Mac computers can send faxes through the Print dialog without installing extra software. Open the document you want to fax (a PDF, Word file, or image), then press Command+P to open Print. In the Print dialog, click the dropdown menu that says "PDF" (bottom left), then select "Fax PDF". Enter the recipient's fax number and click "Fax".

This method works on Mac OS X 10.4 and later. The fax goes through your internet connection, so you do not need a modem or phone line. The fax arrives within minutes. This is the fastest method on Mac if you are already looking at the document you want to send.

If the "Fax PDF" option does not appear in your Print dialog, your Mac may not have fax capability enabled. You can enable it in System Preferences under Printers and Scanners, though this varies by Mac OS version. If you run into trouble, an online fax service is a simpler alternative.

What to Do If You Need to Receive Faxes

Free online fax services usually do not include a fax number for receiving. If someone needs to send you a fax, you have two options: upgrade to a paid plan, or use a service that includes a free receiving number.

eFax Free gives you a fax number you can use to receive faxes at no cost. When someone faxes you, the fax arrives as a PDF in your email. You can send 5 faxes per month for free, and receiving is unlimited. Google Voice (voice.google.com) also lets you receive faxes if you set up a Google Voice number, though this requires a bit more configuration. Most other free services limit receiving to paid accounts.

If you need both sending and receiving and do not want to pay, eFax Free is your best option. If you only need to send faxes, any of the services listed above will work.

Common Mistakes to Avoid

The most common mistake is forgetting to include the country code. If you are sending a fax outside the United States, include the country code before the number — for example, +44 for the United Kingdom or +1 for Canada. Without it, the fax will not go through.

Another mistake is uploading a file format the service does not accept. Most services accept PDF, JPG, PNG, and Word documents, but some do not accept all formats. If your upload fails, convert the file to PDF first. You can do this free using Smallpdf.com or IlovePDF.com.

Do not assume a free service will let you receive faxes. Most free tiers only include sending. If you need to receive, check the service's free plan details before you sign up. Watermarks on free faxes are normal and expected — most recipients do not mind them, but if you need a professional-looking fax, a paid plan removes the watermark.

Frequently Asked Questions

Can I send a fax to an international number for free?

Yes, most free online fax services send to international numbers at no extra cost. Include the country code before the number (for example, +44 for the UK). Some services charge a small fee for international faxes, so check the service's pricing page before you send.

What if the fax does not go through?

Check that the fax number is correct and includes the country code if it is international. Make sure your document is in a supported format (PDF, JPG, PNG, or Word). If the number is correct and the format is right, the recipient's fax machine may be offline or out of paper. Ask them to confirm their fax number and try again in a few minutes.

Do I need to create an account to send a free fax?

FaxZero does not require an account — you can send 3 faxes per month without signing up. eFax Free and HelloFax require you to create a free account. Email-to-fax services like Pamfax also require an account. Creating an account takes less than two minutes and is free.

Can I send a fax from my phone instead of my computer?

Yes. Most online fax services work on phones through their website or mobile app. FaxZero, eFax Free, and HelloFax all have mobile versions. You can upload a photo of a document or a file from your phone's storage, then send it the same way you would from a computer.

Will the recipient know the fax came from a free service?

Free services usually add a watermark to the fax, so the recipient will see the service name on the document. This does not affect whether they can read it, but if you need a professional appearance, a paid plan removes the watermark. Most recipients do not mind watermarks for routine faxes.