How to Send a Fax Online (Step-by-Step Guide)

Why Send a Fax Online?

Physical fax machines require hardware, supplies, and access to a compatible phone line. Online fax services replace that setup with a web app, email integration, or mobile app — letting you send, and on receiving-capable plans receive, faxes from anywhere with an internet connection.

Common situations include:

• Submitting forms — An organization may list fax as one of its accepted delivery methods
• Sending signed copies — A recipient’s instructions may permit a signed document to arrive by fax
• Working with established workflows — Legal, healthcare, insurance, and government offices may still publish fax numbers for specific submissions

Always follow the recipient’s current instructions. They determine whether fax is accepted, which cover sheet or form is required, and whether an original or electronic signature is also needed.

Method 1: Using a Web-Based Fax Service

A web portal is a straightforward approach. Services like RingCentral Fax, Fax.Plus, and eFax provide one where you can:

1. Sign up for an account, choose a plan, or use a free sending allowance if one is available
2. Choose or port a fax number if you need to receive faxes — free and send-only options may not include one
3. Upload a supported document (commonly PDF, Word, or an image)
4. Enter the recipient’s fax number
5. Hit send, then review the delivery status or transmission report

Free trials, free sending allowances, and receiving-number access vary by provider and plan. Check the current limits, billing cadence, and renewal terms before signing up.

Method 2: Sending a Fax via Email

Email-to-fax is common, but availability can be plan-specific. If your plan supports it, here’s how it works:

1. Compose a new email in Gmail, Outlook, or any email client
2. In the To field, enter the fax number in the format required by your provider (current eFax instructions use [email protected], but check the format shown in your account before sending)
3. Attach the document you want to fax
4. Optionally add a cover page message in the email body
5. Send the email — the fax service converts it and transmits it

This is convenient because you don’t need to log into a separate portal.

Method 3: Faxing from Your Phone

Services with mobile apps — Fax.Plus, RingCentral, and eFax — let you fax from your smartphone:

1. Download the app from the App Store or Google Play
2. Sign in to your account
3. Take a photo of the document or select a file
4. Enter the recipient number
5. Send

Fax.Plus documents camera scanning with automatic edge detection in its iPhone app. Mobile features can vary by platform and plan, so check the current app listing before relying on a specific tool.

What You Need

• An online fax account or sending service — see our comparison page for options
• The document in a format your chosen service supports
• The recipient’s fax number with the country and area code required by your provider

Cost

At the time of our editorial review, entry-level paid plans in our comparison started at $8.99 per month with month-to-month billing. Annual prepayment can lower some providers’ effective monthly rates. The examples below reflect terms captured during that review:

• eFax: 7-day free trial
• MyFax: 14-day trial on its Home Office plan
• Fax.Plus: 10 total free sending pages with no subscription; this is a free allowance, not a time-limited trial
• Dropbox Fax: 5 free sending pages plus a 30-day free trial on paid plans

Offers can change and trials may renew into paid service. Check the signup terms, then see our full pricing comparison for current plan details.

Tips for Successful Faxing

• Use PDF format when possible — it preserves formatting best
• Check the fax number carefully — international numbers need the country code
• Check provider limits — maximum pages and file sizes vary; split or compress a large document when needed
• Use high contrast — fax reduces image quality, so avoid light text on light backgrounds
• Confirm delivery — check your sent fax status in the portal or wait for the email confirmation
• Protect sensitive documents — follow the recipient’s instructions and verify that your specific plan’s security and compliance terms fit the material you are sending