Email-to-fax services let you send a fax by attaching a document to an email

You can send a fax without a fax machine by using an email-to-fax service. These services assign you a fax number, and when you email a document to that number, the service converts your email into a fax and sends it to the recipient's fax machine. The recipient sees a standard fax on their end — they do not receive an email.

The process is straightforward: you compose an email, attach your document, send it to your fax number at the service's domain, and the fax arrives at the destination fax number within minutes. Most services charge per fax or offer monthly plans, though some offer a limited number of free faxes each month.

Key Takeaways

  • Email-to-fax services work by converting your email attachment into a fax transmission sent to a real fax machine.
  • You need to know the recipient's fax number and format your email address correctly as [fax number]@[service domain] to route it properly.
  • Most services accept PDF, Word, and image files, but check your provider's requirements before sending important documents.
  • Delivery usually takes a few minutes, and many services send you a confirmation email once the fax reaches the destination.

Choose a fax service and sign up for an account

Popular email-to-fax services include eFax, MyFax, Fax.plus, and Google Fax (through Google Voice). Each service has a different pricing model — some charge per fax, others charge a monthly subscription, and some offer a small number of free faxes per month before charging. Visit the service's website and create an account with your email address and a password.

During signup, the service will assign you a fax number. Write this number down or save it somewhere you can find it easily. You will also receive information about the service's fax domain — the part of the email address after the @ symbol. This domain is how the service knows to convert your email into a fax instead of delivering it as a regular message.

Prepare your document in the correct format

Email-to-fax services accept most common file types: PDF files, Microsoft Word documents (.docx or .doc), image files (JPG, PNG), and sometimes Excel spreadsheets. PDF is the safest choice because it preserves formatting and looks the same on any device. If you have a paper document, scan it to your computer first using a scanner or a smartphone scanning app, then save it as a PDF or image file.

Check that your document is readable before sending. If text is too small, blurry, or cut off at the edges, the recipient may not be able to read it. Most fax services have file size limits — typically 10 to 25 MB per fax — so very large files may be rejected. If your document is multiple pages, combine them into a single file rather than attaching them separately.

Compose your email with the fax number as the recipient

Open your email client (Gmail, Outlook, Yahoo Mail, or whatever you use daily) and start a new message. In the "To" field, type the recipient's fax number followed by @ and the service's fax domain. For example, if you are sending to fax number 555-123-4567 through eFax, you would type 5551234567@efaxsend.com. Do not include hyphens or spaces in the fax number — use only the digits.

The subject line becomes the cover page of the fax, so write something brief and clear like "Invoice from [Your Name]" or "Medical Records Request." Keep the email body short — many fax machines print the email message as part of the fax transmission, so a long message wastes paper on the recipient's end. A single sentence like "Please see attached" is sufficient.

Attach your document and send the email

Click the attachment button in your email (usually a paperclip icon) and select the file you prepared. Verify that the correct file is attached and that the recipient's fax number is typed correctly in the "To" field. Fax numbers are permanent, so if you mistype even one digit, the fax will go to the wrong number or fail to deliver.

Send the email as you normally would. The service will intercept it, convert the attachment to fax format, and transmit it to the recipient's fax machine. Most services send you a confirmation email within a few minutes stating whether the fax was delivered successfully. If delivery fails, the confirmation will explain why — usually because the fax number was incorrect, the recipient's machine was offline, or the file was too large.

Understand delivery times and confirmation

Faxes sent through email-to-fax services typically arrive within 2 to 5 minutes during business hours. If the recipient's fax machine is offline or out of paper, the service usually retries automatically for several hours before reporting failure. You will receive an email confirmation showing the date, time, and status of each fax you send.

Keep these confirmation emails as proof that you sent the fax. If the recipient later claims they never received it, you have documentation of the transmission. Some services also let you log into your account online to view a history of all faxes you have sent and received.

Troubleshoot common problems

If your fax fails to deliver, the most common cause is an incorrect fax number. Double-check the number against the document where you found it — verify each digit one at a time. The second most common issue is an unsupported file format. If you attached a file type your service does not accept, convert it to PDF using an online converter or your computer's print-to-PDF feature, then resend.

If the recipient says they received a blank fax or garbled text, your document may have been too large or the resolution too low. Rescan the document at a higher quality setting, or if it was a digital file, try converting it to PDF and resending. If the service's email address format is wrong, the email will bounce back to you — check your service's website for the exact domain to use, as it varies by provider.

Frequently Asked Questions

Do I need to own a fax machine to use email-to-fax?

No. Email-to-fax services send your document to the recipient's fax machine, not to your own. You only need an email account and a computer or phone to attach and send the file. The recipient receives a standard fax on their machine as if you had sent it from a traditional fax device.

Can I send a fax to multiple people at once?

Most services charge per fax, so sending to multiple recipients means sending multiple emails — one to each fax number. Some services offer a "broadcast fax" feature that lets you send one fax to many numbers at once, but this is usually a paid add-on. Check your service's pricing page to see if this option is available.

What happens if I send a fax to the wrong number?

The fax will be delivered to whoever owns that fax number. You cannot recall it once it is sent. If you realize the mistake when ready, contact your service's support team — some can intercept faxes before they print, but this is not may provide. Always verify the fax number before hitting send.

Is email-to-fax find for sensitive documents?

Email-to-fax services use encryption to protect your documents in transit, similar to regular email. However, the fax itself prints on paper at the destination, so security depends on who has access to that fax machine. For highly sensitive information, confirm with the recipient that they will retrieve the fax promptly and handle it securely.

How much does it cost to send a fax by email?

Pricing varies by service. Some charge $0.99 to $2 per fax, others charge $10 to $30 per month for unlimited faxes, and some offer 5 to 10 free faxes per month before charging. Compare services based on how many faxes you expect to send — occasional users benefit from pay-per-fax, while frequent users save money with a monthly plan.