The basic process: email to fax gateway
To fax from email to a fax machine, you send an email to a special address that converts your message into a fax and delivers it to the recipient's fax machine. The address format is usually the recipient's fax number plus a domain name provided by your fax service — for example, 5551234567@fax.com. The email service intercepts the message, converts the attachment to fax format, and sends it through the phone line to the destination fax machine.
You do not need to install software or buy a fax machine. You only need an email account and a fax service account. Some services are free with limits on pages per month; others charge per fax or per month. The recipient receives the fax on their end exactly as if you had sent it from a traditional fax machine.
Key Takeaways
- Email-to-fax services convert your email and attachments into fax format and send them to a fax machine using a special email address.
- You attach a PDF, Word document, or image file to your email — the service handles the conversion automatically.
- Common free or low-cost services include Google Fax, eFax, and Fax.plus, each with different page limits and pricing.
- The recipient's fax machine receives your message as a standard fax with no changes to their equipment or process.
- Delivery usually takes a few minutes, though some services queue faxes during off-peak hours to reduce cost.
Setting up an email-to-fax account
Start by choosing a fax service. Google Fax is built into Google Workspace and works through Google Docs — if you use Gmail for work, check whether your organization already has it. eFax, Fax.plus, and HelloFax are standalone services that work with any email provider. Each has a free trial or free tier with restrictions.
Sign up on the service's website with your email address and a password. The service assigns you a fax number or lets you choose one in your area code. You will receive a special fax-to-email address — this is what you give to people who want to send faxes to you, not what you use to send them out. To send a fax, you use the reverse: their fax number plus the service's domain.
Some services require you to verify your email address by clicking a link in a confirmation message. A few ask for a phone number or payment method even on the free tier. Read the terms before signing up so you know what the free version includes — page limits, number of faxes per month, and whether cover pages are counted against your limit.
Attaching documents and sending the fax
Open your email client — Gmail, Outlook, Apple Mail, or any other — and start a new message. In the "To" field, type the recipient's fax number followed by the service domain. For eFax, this might be 5551234567@efax.com. For Fax.plus, it might be 5551234567@fax.plus. Check your service's documentation for the exact format.
Attach the file you want to fax. Most services accept PDF, Word (.docx), Excel (.xlsx), PowerPoint (.pptx), and image files (JPG, PNG, TIFF). PDF is the safest choice because it preserves formatting exactly. If you are faxing a paper document, scan it to PDF first using your phone's camera app or a scanner, then attach the file.
Add a subject line and a message body if you want — the service will include these as a cover page. Some services let you customize the cover page in your account settings; others use a standard template. Send the email as you normally would. The service processes it within a few minutes and sends the fax to the recipient's machine.
What happens if the fax fails to send
If the fax number is wrong or the recipient's machine is offline, the service will send you a delivery report by email. This report tells you whether the fax went through, how many pages were sent, and the time it took. If delivery failed, check the fax number and try again.
Some services retry automatically — they may attempt to send the fax again a few hours later or the next day. Others require you to resend manually. Check your account dashboard or the delivery report email to see what happened. If the same number fails twice, call the recipient to confirm their fax number is correct and their machine is turned on.
Comparing free and paid fax services
| Service | Free Tier | Cost (Paid) | Best For |
|---|---|---|---|
| Google Fax | Included with Google Workspace | Included in Workspace plan ($6–$18/month) | Teams already using Google Workspace |
| eFax | None; trial only | $10–$30/month | Regular business faxing |
| Fax.plus | 5 pages/month | $5–$15/month | Occasional faxing |
| HelloFax | None; trial only | $10–$20/month | Document signing and faxing combined |
Google Fax is the cheapest option if you already pay for Google Workspace. Fax.plus offers the most generous free tier for occasional users. eFax and HelloFax are better for businesses that send many faxes per month and need detailed reporting and archiving.
International faxing costs more across all services — typically $1 to $3 per page instead of a flat monthly rate. If you fax internationally often, factor that into your choice. Some services do not support certain countries, so verify the destination before committing to a plan.
Tips for reliable fax delivery
Use PDF format whenever possible. PDFs preserve fonts, images, and page layout better than Word documents, and fax machines receive them more consistently. If you are faxing a form that someone will fill out by hand, PDF is essential.
Keep file size under 10 MB. Large files take longer to convert and send, and some services reject them. If you are faxing many pages, split the document into smaller files and send them as separate faxes.
Send during business hours. Some services queue faxes sent late at night or on weekends to reduce phone line costs, which delays delivery. If the fax is urgent, send it between 8 a.m. and 5 p.m. on a weekday.
Confirm the fax number before sending. A single wrong digit sends your document to a stranger's machine. Ask the recipient to text or email their fax number rather than reading it aloud.
Frequently Asked Questions
Can I fax to an international fax machine?
Yes, most services support international faxing, but the cost is higher — typically $1 to $3 per page instead of a flat monthly rate. Check your service's pricing for the country you are faxing to before sending.
What if the recipient's fax machine is out of paper or broken?
The fax will fail to deliver, and you will receive a delivery report telling you so. The recipient will not see the fax at all. Call them to let them know you tried to send it, and ask them to check their machine or provide an email address instead.
Does the recipient need to do anything special to receive my fax?
No. They receive it on their fax machine exactly as if you had sent it from a traditional fax machine. Their machine prints it automatically. They do not need any special account or software.
Can I send a fax to multiple people at once?
You must send separate emails to each fax number. Most email clients let you add multiple recipients in the "To" field, but fax services treat each address as a separate fax and charge accordingly. Sending to five fax numbers counts as five faxes, not one.
What if I need to fax something urgently and my service is down?
Sign up for a free trial with Fax.plus or another provider and send your fax when ready. Most services set up within minutes of signup, so you can send within the hour. Cancel afterward if you do not need the service again.