By David Thompson · Published April 29, 2026 · Updated June 8, 2026 · 9 min read
If you're searching for the best fax software for Windows 10 or Windows 11, you have two fundamentally different categories to choose from: cloud-based services that work in any browser, and modem-dependent programs like the built-in Windows Fax and Scan. The right choice depends on your hardware, volume, and compliance needs — and the differences between them are significant.
We tested and evaluated five options across pricing, ease of use, Windows integration, and HIPAA compliance. Here's what we found.
Quick Verdict
mFax Business is the best overall fax software for Windows in 2026 — HIPAA compliant on all plans, no hardware required, and available from any browser. RingCentral Fax is the top pick if you need deep Microsoft Teams and Outlook integration. Windows Fax and Scan remains a zero-cost option if you already own a modem and landline.
At a Glance: Top 5 Fax Software for Windows Compared
| Service | Starting Price | Windows App | HIPAA | Best For |
|---|---|---|---|---|
| mFax Business | From $9/mo | Browser / Print driver | All plans | Best overall |
| eFax | $18.99/mo | Desktop app + browser | Protect plan only ($50) | Established enterprises |
| Fax.Plus | Free / $6.99/mo | Browser only | Enterprise only ($80+) | Lowest entry price |
| RingCentral Fax | $17.99/mo (annual) | Full native desktop app | All plans | Microsoft ecosystem |
| Windows Fax & Scan | Free | Built-in app | None | Modem + landline users |
How We Evaluated
Every service was assessed on five criteria:
- Windows compatibility — native app, browser-based, or print driver; behavior on both Windows 10 and 11
- Ease of use — time from sign-up to first sent fax
- Pricing and value — cost per page relative to features included
- HIPAA compliance — encryption, BAA availability, and which plan tier requires it
- Reliability — delivery confirmation, busy signal handling, and customer support quality
#1 — mFax Business
mFax Business
mFax Business is the best fax software for Windows for most users — and it's not particularly close. You open mFax.to in any browser, upload a PDF or document, enter the fax number, and you're done. There's no hardware to buy, no driver to install, and no modem to configure.
For Windows users who want tighter desktop integration, mFax offers a print driver that adds a "Fax via mFax" option to the print dialog in any Windows application — Word, Excel, Outlook, Chrome, and more. It's the closest you'll get to native Windows behavior without installing a full desktop app.
HIPAA compliance is included on all paid plans with a Business Associate Agreement (BAA) at no extra cost — a significant advantage over eFax and Fax.Plus, which gate compliance behind expensive top-tier plans.
Plans: Fully customizable, usage-based pricing from about $9/mo — build your own plan with a live calculator by choosing the exact seats (1–35) and pages (200–5,000) you need ($3/seat + $4 per 100 pages), no rigid fixed tiers
For personal faxing, the mFax mobile app covers iPhone and Android — a natural complement if you ever need to fax away from your desk.
Pros
- HIPAA compliant with BAA on every paid plan — no upgrade required
- Works instantly in any Windows browser — zero installation
- Print driver lets you fax directly from Word, Outlook, and other apps
- Build your own plan from about $9/mo (billed annually) — pick your exact seats and pages, pay per seat + pages, no fixed tiers
- 98% delivery success rate with receipt confirmation
- 5 million+ users, 4.8-star App Store rating
Cons
- No standalone native Windows desktop application
- Print driver doesn't support multi-document batch jobs in a single send
Windows 11 Note
mFax Business works identically on Windows 10 and Windows 11, including on ARM-based devices (Surface Pro X, Surface Pro 11). No compatibility issues.
#2 — eFax
eFax
eFax is the service to choose if you specifically want a native Windows desktop application. The eFax Messenger app installs on Windows 10 and 11 and gives you a dedicated inbox, send queue, and Outlook plug-in — similar to how an email client works.
That said, eFax's pricing model is less competitive than alternatives. The entry Plus plan at $18.99/month includes only 170 send + receive pages combined, and HIPAA compliance is locked behind the $50/month Protect plan — a meaningful cost jump if you're in healthcare or legal.
For established enterprises that value brand recognition and a true Windows app, eFax is a reasonable choice. For everyone else, the value proposition is weaker.
Plans: Plus ($18.99/mo, 170 pages) · Pro ($24.99/mo, 275 pages) · Protect ($50/mo, 1,000 pages, HIPAA)
See our detailed mFax vs. eFax comparison if you're deciding between these two.
Pros
- eFax Messenger — a true native Windows desktop application
- Deep Microsoft Outlook integration built into the app
- One of the longest-running online fax services — established and reliable
- Bulk faxing to multiple recipients simultaneously
- HITRUST certified at enterprise tier
Cons
- HIPAA compliance requires the $50/mo Protect plan — not included on entry plans
- Most expensive entry price of the cloud options reviewed
- 90-day fax archive limit on lower plans
- Frequent cancellation complaints in user reviews
#3 — Fax.Plus
Fax.Plus
Fax.Plus has the lowest barrier to entry: a free tier for occasional users, and a Basic plan at $6.99/month (annual billing) for light senders. It works entirely in the browser on Windows — no installation required.
The catch is HIPAA compliance: unlike mFax Business and RingCentral Fax, Fax.Plus only offers HIPAA compliance with BAA on the Enterprise plan at $79.99/month (annual). If your organization handles healthcare data, Fax.Plus becomes one of the more expensive options once compliance is factored in.
For a small business or freelancer without compliance requirements who sends fewer than 200 faxes per month, the Basic plan is hard to beat on price.
Plans: Free (10 pages, lifetime) · Basic ($6.99/mo annual, 200 pages) · Premium ($13.99/mo annual, 500 pages) · Business ($27.99/mo annual, 1,000 pages, 5 users)
Pros
- Free tier available — 10 lifetime pages, no credit card required
- Basic plan at $6.99/mo (annual) — lowest paid entry point
- SOC 2 Type II certified
- Clean, intuitive web interface
- Good international fax number coverage
Cons
- HIPAA compliance only on Enterprise plan ($79.99+/mo) — expensive gating
- No native Windows desktop app
- Free tier is effectively a trial — 10 total pages with no receiving number
- Billing auto-renewal complaints in user reviews
- Limited customer support accessibility on lower plans
#4 — RingCentral Fax
RingCentral Fax
RingCentral Fax is the top choice for organizations already using Microsoft 365. The integration goes beyond email — a fax icon appears natively inside Microsoft Word, Outlook, and Teams, letting users send faxes directly from the apps they already work in. The full Windows desktop app provides a dedicated fax inbox alongside RingCentral's other communication tools.
At $17.99/month (annual) with 1,500 pages included, it also offers the most generous page allowance at the entry level. HIPAA compliance with BAA is included on all plans — no gating to a higher tier. For a healthcare practice or legal firm already on Microsoft 365, this is the strongest all-around package.
For a detailed breakdown, see our RingCentral Fax review.
Plans: Fax 1500 ($17.99/mo annual, 1,500 pages) · Higher-volume plans available
Pros
- Full native Windows desktop app with fax inbox and send queue
- Deep Microsoft Teams, Outlook, and Word integration — fax icon appears directly in Office apps
- Batch faxing and scheduled faxing ('Send Later')
- HIPAA compliant with BAA on all plans
- 1,500 pages/month on the entry plan — highest page allowance at this price tier
Cons
- Most expensive option for standalone fax use
- No built-in electronic signature
- Overkill for individual or very small teams with basic needs
Free Trial
RingCentral Fax offers a 15-day free trial — enough time to test the Teams and Outlook integration before committing.
#5 — Windows Fax and Scan (Built-In)
Windows Fax and Scan
Windows Fax and Scan is the built-in option — free, no subscription, and it works without an internet connection. On Windows 10, it comes pre-installed. On Windows 11, you must add it manually via Settings > Apps > Optional Features, and it is unavailable entirely on ARM-based Windows 11 devices.
The core limitation is hardware: you need a physical USB fax modem and an active analog telephone landline. Cable, fiber, and VoIP lines do not work with a standard fax modem. In 2026, most homes and offices no longer have analog landlines — which makes this option impractical for the majority of users.
For the full setup walkthrough, see our guide to Windows Fax and Scan.
Cost: Free (modem ~$25–$50 extra; analog landline ~$15–$40/mo)
Pros
- Completely free — included with Windows
- No subscription or internet connection required
- Works as a genuine fax machine replacement if hardware is available
- Supports auto-receive with ring count settings
Cons
- Requires a USB fax modem (~$25–$50) — most modern PCs don't have one
- Requires an active analog landline — VoIP and fiber lines do NOT work
- Not available by default on Windows 11 (must install as optional feature)
- Not available at all on ARM Windows 11 devices
- No HIPAA compliance — no encryption, no audit trail, no BAA possible
- PC must remain powered on 24/7 to receive faxes
- Modem driver compatibility increasingly problematic on Windows 11
Windows 10 vs. Windows 11: What Changes for Faxing?
For cloud-based fax software, there is no meaningful difference between Windows 10 and Windows 11. mFax Business, eFax, Fax.Plus, and RingCentral Fax all work identically in any modern browser on either OS.
The difference only matters for Windows Fax and Scan:
| Factor | Windows 10 | Windows 11 |
|---|---|---|
| Pre-installed | Yes | No — must install manually |
| ARM device support | Generally supported | Not available at all |
| Modem driver compatibility | Broader legacy support | Increasing issues; some drivers removed |
| Cloud fax services | Works fine | Works fine |
If you're on a newer Windows 11 machine — especially a recent Surface device — skip Windows Fax and Scan entirely and use a cloud service.
For step-by-step instructions specific to each OS, see our guides to faxing from Windows 10 and faxing from Windows 11.
What to Look for in Windows Fax Software
Before choosing a service, answer these four questions:
1. Do you have a modem and landline? If yes, Windows Fax and Scan is a viable free option. If no — which describes most users in 2026 — choose a cloud service.
2. Do you need HIPAA compliance? Healthcare providers, insurers, and legal firms handling protected health information must use a HIPAA-compliant service with a BAA. mFax Business and RingCentral Fax include this on all paid plans. eFax requires its $50/month Protect plan. Fax.Plus requires the Enterprise tier at $79.99+/month. See our full HIPAA fax compliance guide.
3. Do you need Microsoft 365 integration? If your team lives in Teams and Outlook, RingCentral Fax is the only service with truly native integration — fax icons appear inside Office apps without any workarounds.
4. How many pages do you send per month? Occasional (under 50 pages): Fax.Plus Basic or mFax Business Starter. Regular business use (50–500 pages): mFax Business or RingCentral Fax. High volume (1,000+ pages): compare overage rates carefully — mFax Business Pro is often cheaper per page than alternatives at scale.
For a broader comparison of online fax services for business, see our best business fax services guide.
Our Recommendation
For most Windows users: mFax Business is the clear winner. HIPAA compliance on all plans, a print driver for Windows app integration, competitive pricing starting at about $9/mo, and a 98% delivery success rate make it the strongest overall package.
For Microsoft 365 teams: RingCentral Fax wins on ecosystem integration — native Teams and Outlook faxing is genuinely useful if your organization is already standardized on Microsoft.
For budget-first users without compliance needs: Fax.Plus Basic at $6.99/month (annual) or the free 10-page tier is the lowest-cost entry point.
For modem + landline users: Windows Fax and Scan is free, reliable, and requires no subscription — if you have the hardware.
Ready to send your first fax from Windows? Visit mFax.to — no modem, no phone line, no installation. Upload your document, enter the fax number, and send in under two minutes. Trusted by 5 million users with a 4.8-star rating.