By Alexey Spasskiy · Published April 23, 2025 · Updated June 8, 2026 · 10 min read
Quick Answer: The fastest way to send a fax is with a mobile app like mFax. Upload a PDF or snap a photo, enter the fax number, and tap Send — done in under 2 minutes, no fax machine required.
Need to send a fax but don't have a fax machine sitting next to you? You're not alone. Over 17 billion faxes are sent globally every year, and the vast majority no longer go through physical machines. In 2026, you can send a fax from your phone, computer, email inbox, a traditional fax machine, or even a retail store — whichever is most convenient.
This guide covers every method for how to send a fax, step by step. Whether you're faxing a tax form to the IRS, sending medical records to a clinic, or transmitting a signed contract, you'll find the right approach below.
The Fastest Way
mFax.to lets you send a fax from your phone in under 2 minutes. Scan a document with your camera or upload a PDF, enter the number, and tap Send. Over 5 million people have sent faxes this way.
Pick the Right Method
Not every fax method fits every situation. Here's a quick comparison to help you choose:
| Method | Speed | Cost per Page | Best For |
|---|---|---|---|
| Phone app | ~2 min | $0.10–$0.25 | Quick, on-the-go faxing |
| Computer (web portal) | ~3 min | $0.10–$0.25 | Multi-page documents from your desk |
| Email-to-fax | ~5 min | Free–$0.25 | People who live in their inbox |
| Fax machine | ~5 min | Phone line + supplies | Offices with existing hardware |
| Retail store | 15–30 min | $1.89–$2.99 | No device or internet access at all |
The fastest and cheapest option for most people: a phone app or web-based service. Traditional fax machines still work fine but require a dedicated phone line. Store faxing is the most expensive by far.
Method 1: Send a Fax from Your Phone
The fastest and most popular way to send a fax in 2026 is from your smartphone. A fax app handles scanning, formatting, transmitting, and confirming delivery — right from your pocket.
Here's how to do it with mFax:
Download the App
Get mFax from the App Store or Google Play and create a free account. Setup takes about 30 seconds.
Add Your Document
Upload a PDF from your files, or use the built-in camera scanner to photograph a paper document. The app straightens and enhances the scan automatically.
Enter the Fax Number
Type the recipient's fax number, including the area code. For international faxes, add the country code (e.g., +44 for the UK). Optionally, add a cover sheet.
Send and Confirm
Tap Send. You'll receive a delivery confirmation within 1–3 minutes, proving the fax arrived successfully.
This method works for both iPhone and Android devices. You can also fax from an iPad using the same app.
No Phone Line Needed
A fax app uses the internet — not your cellular line — to transmit the fax. You need Wi-Fi or mobile data, but you do not need a phone line. Learn more about faxing without a phone line.
Method 2: Send a Fax from Your Computer
Working at your desk with a multi-page document already on your screen? A web-based fax service is the most efficient option. No software to install — just open your browser.
Go to the Fax Service
Visit mFax.to or choose from our list of the best online fax services and create an account.
Upload Your Document
Drag and drop your PDF, Word document, or image file into the upload area. Most services accept PDF, DOC, DOCX, JPG, PNG, and TIFF formats.
Enter the Recipient's Fax Number
Type the destination fax number. For US numbers, use the 10-digit format (e.g., 212-555-0199). For international faxes, add the country code.
Add a Cover Sheet (Optional)
Most services let you attach a fax cover sheet with sender and recipient info. Some industries — especially healthcare — require one.
Click Send
Hit Send and wait for the confirmation email or dashboard notification. A delivery receipt confirms the fax was received.
This works on Windows, Mac, and Chromebook — anything with a web browser. For platform-specific details, see our guides on faxing from a computer and faxing on Mac.
Method 3: Send a Fax from Email
If you prefer working from your inbox, email-to-fax lets you send faxes as easily as composing a message. No extra apps or browser tabs required.
Sign Up for an Email-to-Fax Service
Create an account with mFax.to or another provider that supports email-to-fax. You'll receive a fax gateway email address.
Compose a New Email
Open Gmail, Outlook, Yahoo, or any email client. In the To field, enter the fax number in the service's required format (e.g., 12125550199@send.mfax.to).
Attach Your Document
Attach the document as a PDF. The email body text becomes your cover page message.
Hit Send
Send the email. The service converts your attachment and delivers it as a fax. You'll get a confirmation reply within minutes.
For detailed walkthroughs by email provider, see our guides for Gmail, Outlook, and all email clients.
HIPAA Warning
If you're faxing protected health information (PHI), make sure your email-to-fax service is HIPAA compliant and has a signed Business Associate Agreement (BAA). Regular email alone does not meet HIPAA requirements.
Method 4: Send a Fax with a Fax Machine
Still have a fax machine at the office? Traditional faxing works the same way it has for decades. Here's the process:
Connect to a Phone Line
Plug the fax machine into an active telephone wall jack using a standard phone cable (RJ-11). The machine needs a dedicated analog phone line — VoIP lines often cause issues.
Load Your Document
Place your pages face-down (or face-up, depending on the model) in the automatic document feeder. Most machines accept standard letter-size (8.5 × 11 in) paper.
Dial the Fax Number
Use the machine's keypad to enter the recipient's fax number. For long-distance, dial 1 + area code + number. For international, dial 011 + country code + number. See our guide on how to dial a fax number.
Press Start
Press the Start or Send button. The machine scans each page, dials the number, and transmits the data. You'll hear a handshake tone followed by page transmission sounds.
Check the Confirmation Page
The machine prints a transmission report showing whether the fax was delivered, the number of pages sent, and the total transmission time.
For a more detailed walkthrough, see our beginner's guide to using a fax machine. If you have a multifunction printer with built-in fax, check our how to fax from a printer guide for HP, Brother, Canon, and Epson models.
Curious How It Works?
A traditional fax machine scans the document, converts it to audio tones, and sends those tones over the phone line. The receiving machine decodes the tones back into an image. Read our full explainer on how fax technology works.
Method 5: Fax at a Retail Store
No phone, no computer, no fax machine? You can still send a fax by visiting a retail store with fax services. Bring your document and the recipient's fax number.
| Store | Fax Available? | Cost per Page | Notes |
|---|---|---|---|
| UPS Store | Yes | $1.89–$2.49 | Most locations; pricing varies local vs. national |
| FedEx Office | Yes | $1.89–$2.99 | Self-service and assisted options |
| Staples | Yes | $1.89–$2.49 | Available at copy center |
| Office Depot | Yes | $1.79–$2.49 | Copy center, varies by location |
| Walgreens | No | — | Does not offer fax services |
| CVS | No | — | Does not offer fax services |
| USPS | No | — | Post offices do not fax |
| Public Library | Varies | Free–$1.00 | Call your local branch first |
Store faxing is the most expensive option — 10× or more per page compared to online services. You also have to factor in travel time and waiting in line.
For detailed pricing and tips, see our guides for UPS, FedEx, Staples, Office Depot, and our full fax near me directory.
Skip the Store
mFax.to lets you fax from your phone for a fraction of store prices — no trip, no waiting, no per-page markup.
How to Prepare Your Document
A well-prepared document transmits faster and arrives legible. Follow these tips regardless of which method you use:
- Use PDF format when possible. PDFs preserve formatting and are universally accepted. Need to convert a file? Use our free document converter.
- Standard paper size: Stick to US Letter (8.5 × 11 in) or A4 for international faxes.
- Black text on white background: Fax transmissions are black and white. Colored backgrounds, light gray text, or watermarks reduce legibility.
- Minimum 12pt font: Smaller text may become unreadable after transmission.
- Combine multi-page files first: Merge separate documents into a single PDF with our free merge PDF tool.
- Check the file size: Most services accept files up to 10–20 MB. Compress oversized files with our PDF optimizer.
Accepted File Formats
| Format | Supported? | Notes |
|---|---|---|
| Yes | Best option — preserves layout perfectly | |
| Word (DOC/DOCX) | Yes | Converted to PDF automatically |
| JPG / PNG | Yes | Good for scanned or photographed documents |
| TIFF | Yes | Native fax format, widely supported |
| Excel (XLS/XLSX) | Yes | Check formatting after conversion |
| Google Docs | Yes | Export as PDF first, or fax directly from Google Docs |
How Much Does It Cost to Send a Fax?
The cost depends entirely on your method:
| Method | Cost | What You Get |
|---|---|---|
| mFax app | From $0.10/page | Upload, send, delivery receipt |
| Online fax subscription | $9.99–$25/mo | 100–500 pages/mo included |
| Email-to-fax | Same as subscription | Typically bundled with your plan |
| Fax machine | Phone line ($20–40/mo) + toner + paper | Unlimited pages, but ongoing costs |
| UPS / FedEx / Staples | $1.89–$2.99/page | Plus travel time and effort |
Bottom line: Online fax services cost 5–20× less per page than store faxing. If you need to send just one fax, a pay-per-page app like mFax is the most economical choice. For regular faxing, compare the best online fax services or check out free fax services for occasional use.
For a deeper cost analysis, see our guide on fax cost per page.
Do You Need a Cover Sheet?
A fax cover sheet is a page that goes in front of your document with sender and recipient info plus a brief message. It's optional for casual faxing but required or strongly recommended in several situations:
- Healthcare (HIPAA): A cover sheet with a confidentiality disclaimer is standard when faxing protected health information.
- Legal: Law firms typically use a legal fax cover sheet with an attorney-client privilege notice.
- IRS submissions: An IRS fax cover sheet helps route your forms to the correct department.
- Business: A professional cover sheet adds credibility and ensures the fax reaches the right person.
Not sure whether you need a cover sheet or a cover letter? See our guide on the difference between fax cover letters and cover sheets.
Generate one for free with our fax cover sheet generator, or browse our template library.
Troubleshooting: Fax Didn't Go Through?
If your fax fails, try these fixes before giving up:
- Double-check the fax number: Include the area code. For international, add the country code. Omitting a digit is the most common cause of failure.
- Wait and retry: The receiving machine may be busy, out of paper, or temporarily offline. Most online services auto-retry 2–3 times.
- Check your file: Corrupted or password-protected PDFs can cause failures. Re-export the document and try again.
- Reduce the page count: Some older fax machines struggle with transmissions over 20 pages. Split your document into smaller batches.
- Try a different method: If email-to-fax isn't working, try faxing from your phone or the web portal instead.
For traditional fax machines, the most common issues are VoIP incompatibility and busy signals. Online fax services bypass these problems entirely because they connect to the phone network server-side.
Pro Tip
Send a test fax before transmitting something critical. This confirms your setup works and the recipient's machine is active.
How Long Does a Fax Take?
A single-page fax takes about 30–60 seconds to transmit over a standard phone line. Multi-page documents take proportionally longer — a 10-page fax typically takes 5–8 minutes on a traditional machine.
Online fax services are often faster because they connect through high-speed internet rather than analog phone lines. Most online faxes — including confirmation — complete in 1–3 minutes regardless of page count.
Factors that affect speed:
- Page count: More pages = more time
- Document complexity: Pages with images or dense graphics take longer than plain text
- Receiving machine: Older machines negotiate slower connection speeds
- Resolution setting: Standard resolution (200 × 100 dpi) transmits twice as fast as fine resolution (200 × 200 dpi)
For a detailed breakdown, see how long does a fax take.
Receiving Faxes
Sending is only half the equation. If someone needs to fax something back to you, you'll need a way to receive faxes too.
The simplest option: get a virtual fax number from an online fax service. Incoming faxes arrive as PDF attachments in your email or app — no hardware needed. Most services let you pick a local number in your area code.
- mFax app: Receive faxes as push notifications on your phone
- mFax Business: Get a dedicated virtual fax number with team access
- Email delivery: Have incoming faxes forwarded to your inbox automatically — see our guide on fax to email
Get Started
You now know every way to send a fax in 2026 — from your phone, computer, email, a fax machine, or a store counter. For most people, the fastest and cheapest option is a mobile fax app.
Download mFax and send your first fax in under 2 minutes. Upload a document or scan one with your camera, enter the fax number, and tap Send. No machine, no phone line, no store — just a delivered fax with a confirmation receipt.
For business teams, mFax Business offers virtual fax numbers, team accounts, and HIPAA compliance — starting at about $9/mo (billed annually). You build your own plan with a live calculator, choosing the exact seats and pages you need ($3/seat + $4 per 100 pages) and paying only for what you use, instead of being locked into rigid fixed tiers.