By Michael Chen · Published March 18, 2026 · Updated June 8, 2026 · 10 min read
The fax machine isn't extinct — it's just moved to your pocket. A digital fax app replaces bulky hardware with software you already own: your phone or browser. You upload a PDF, type a fax number, and the document arrives in seconds.
The challenge is picking the right app. The market ranges from free-tier tools for the occasional user to enterprise platforms with HIPAA audit trails and API automation. This guide cuts through the noise and tells you exactly which digital fax app fits your situation.
Quick Picks
- Best for personal / mobile use: mFax.to — fax from your phone in under 2 minutes
- Best for business & HIPAA: mFax Business — team accounts, virtual numbers, BAA included
- Best free tier: Fax.Plus — 10 pages free, no credit card
- Best for enterprise: eFax — 25+ years, Fortune 500 track record
- Best budget entry price: CocoFax — starts at $4.99/mo
What Is a Digital Fax App?
A digital fax app (also called an online fax service or internet fax app) converts your document into a fax signal and transmits it over the internet to any fax machine or fax number worldwide. The recipient doesn't need to be using a digital app — the service bridges the gap between internet and the traditional phone network automatically.
Most digital fax apps support:
- Sending — upload PDF, Word, JPG, or other formats; enter recipient's fax number; send
- Receiving — a virtual fax number is assigned to you; incoming faxes land in your app inbox as PDFs
- Mobile faxing — native iOS and Android apps let you scan physical documents with your camera
- Email-to-fax — send a fax by composing an email to
[faxnumber]@provider.com
Still Widely Used
Over 17 billion fax pages are sent globally every year. In the US healthcare sector alone, fax handles roughly 9 billion pages annually — making HIPAA-compliant digital fax apps critical infrastructure, not a legacy curiosity.
Top Digital Fax Apps at a Glance
| App | Best For | Starting Price | Free Tier | HIPAA |
|---|---|---|---|---|
| mFax | Personal / Mobile | Pay-per-fax or subscription | Pay-as-you-go | Standard TLS |
| mFax Business | Teams & Healthcare | From $9/mo | 14-day trial | Yes — BAA included |
| eFax | Enterprise / Legacy | $18.99/mo | No (promo offer) | Yes (Protect/Corp tier) |
| Fax.Plus | Budget / Free Tier | $6.99/mo | Yes — 10 pages free | Yes (Enterprise tier) |
| iFax | Built-in eSignature | $12.49/mo | Yes — 5 pages/mo | Yes (Professional+) |
| RingCentral | High Volume / UCaaS | $17.99/mo | Trial only | Yes — BAA available |
| CocoFax | Lowest Entry Price | $4.99/mo | 10 pages / 24 hrs | Yes (limited BAA info) |
In-Depth Reviews
1. mFax — Best Digital Fax App for Personal Use
mFax.to is the fastest way to send a one-off fax from your phone. Open the app, upload a PDF or snap a photo of your document, enter the fax number, and hit send. No monthly subscription required if you prefer pay-as-you-go.
With over 5 million users and a 4.8-star App Store rating, mFax has become the go-to for individuals faxing tax forms, medical records, contracts, and legal documents. It costs significantly less than store faxing at UPS ($2–5/page) and never requires a trip anywhere.
Best for: Freelancers, remote workers, individuals faxing IRS forms or medical documents, anyone who needs to send a fax today without signing up for a monthly plan.
Pros
- Fax from iPhone or Android in under 2 minutes
- 4.8-star App Store rating, 5M+ users
- Pay-per-fax option — no monthly commitment
- Scan physical documents with phone camera
- 98% delivery success rate with confirmation receipts
Cons
- No dedicated HIPAA BAA on the consumer plan
- Less suitable for teams or high-volume workflows
2. mFax Business — Best for Teams & HIPAA Compliance
mFax Business is built for organizations that fax regularly and need to stay compliant. Healthcare providers, legal firms, and insurance companies use it to replace physical fax machines with a cloud-based dashboard. Every plan includes a Business Associate Agreement (BAA), which is the legal requirement for handling protected health information under HIPAA.
Team accounts let multiple users share a fax inbox, and role-based access controls keep sensitive documents visible only to the right people. The virtual fax number means you get a dedicated line without any hardware installation.
| Plan | Price | Best For |
|---|---|---|
| Build your own | From $9/mo | Any business — pick your seats + pages, no fixed tiers |
Best for: Medical practices, law offices, insurance teams, or any business replacing a physical fax machine and needing HIPAA compliance out of the box.
Pros
- HIPAA-ready with BAA on all plans
- Virtual fax numbers — no hardware required
- Team accounts with role-based access
- Web dashboard: send, receive, and manage from any browser
- Delivery tracking, confirmation receipts, and audit logs
- Build your own plan from about $9/mo — pick your seats + pages, pay per use, no fixed tiers
Cons
- Overkill (and over-priced) for solo personal use
- 14-day trial only — no permanent free tier
3. eFax — Best for Enterprise & Legacy Integration
eFax is the original online fax service — it's been operating since 1996 and carries the trust of large enterprises and regulated industries. Its HITRUST certification on the Corporate plan is the gold standard for healthcare compliance, exceeding basic HIPAA requirements.
The main drawback is price. You get only 170 pages at $18.99/mo on the entry plan — less value than most competitors. For individual users or small businesses, eFax is expensive. For enterprise IT teams that need a proven vendor with audit-ready documentation and 24/7 live support, it justifies the premium.
Best for: Enterprise organizations, regulated industries, and companies that need HITRUST-level compliance documentation for audits.
Pros
- 25+ year track record, trusted by Fortune 500 companies
- 200+ country coverage for international faxing
- HITRUST certification on Corporate/Enterprise plans
- eSignature (jSign) included on all paid plans
- 24/7 phone, chat, and email support
- Unlimited document storage
Cons
- Most expensive entry price at $18.99/mo for just 170 pages
- HIPAA BAA only on higher-tier Protect/Corporate plans
- $10 setup fee on some plans
- Interface feels dated compared to modern alternatives
4. Fax.Plus — Best Free Tier & Budget Option
Fax.Plus wins on value at every tier. The permanent free plan (10 pages, no expiration) is the best in the market for testing or very light use. Paid plans start at $6.99/mo for 200 pages — well below eFax's $18.99 entry point.
The catch: HIPAA compliance requires the Enterprise plan at $79.99/mo. If your organization handles PHI, this creates a significant cost jump. For non-healthcare businesses and individuals, however, Fax.Plus delivers excellent security certifications (SOC 2, ISO 27001) at a budget-friendly price.
Best for: Cost-conscious users, international faxers, developers building fax integrations, and non-healthcare businesses that want solid security without the HIPAA price premium.
Pros
- Permanent free plan — 10 pages, no credit card required
- Most affordable paid plan at $6.99/mo
- 180+ countries supported
- SOC 2 Type II and ISO 27001 certified
- Slack integration and API on higher tiers
- Clean, modern interface
Cons
- HIPAA BAA only on Enterprise plan ($79.99/mo) — a big jump
- Free plan is send-only — no dedicated fax number to receive
- eSignature less robust than iFax or eFax
5. iFax — Best Built-In eSignature
iFax stands out by bundling eSignature capabilities into every paid plan — competitors like RingCentral offer no eSign tools at all, and eFax charges extra or requires higher tiers. If your workflow involves signing and faxing documents (contracts, consent forms, agreements), iFax removes a tool from your stack.
The compliance credentials are strong: HIPAA, SOC 2, and GLBA certifications make iFax suitable for healthcare, financial services, and legal workflows. The mobile apps consistently receive top marks in user reviews for ease of use.
Best for: Professionals who need to both sign and fax documents, legal firms, and anyone wanting an all-in-one document workflow app.
Pros
- Built-in eSignature on all paid plans — no third-party tool needed
- Military-grade AES-256 encryption
- HIPAA + SOC 2 + GLBA compliant on Professional+ plans
- Top-rated mobile apps (iOS, Android, Windows, Mac)
- Google Workspace integration
- 7-day free trial
Cons
- More expensive than Fax.Plus or CocoFax at entry level
- Free tier is very limited (5 pages/mo)
- HIPAA requires Professional+ upgrade
6. CocoFax — Best Entry-Level Price
CocoFax offers the lowest starting price of any reputable digital fax app at $4.99/mo. If budget is the primary concern and you send under 60 pages a month, it delivers solid core faxing with proper encryption and API access.
The tradeoffs are real: the Lite plan's 60-page cap will strain most business users quickly, and the lack of transparent BAA documentation makes it unsuitable for healthcare without further verification. For price-sensitive personal users and small businesses without HIPAA requirements, CocoFax is worth considering.
Best for: Budget-conscious individuals and small businesses with low monthly fax volume and no HIPAA compliance requirements.
Pros
- Lowest entry price at $4.99/mo
- 100+ countries supported
- AES-256 encryption, two-factor authentication
- API access available on higher plans
- Swiss data centers for privacy-conscious users
- 30-day money-back guarantee
Cons
- Only 60 pages/mo on the Lite plan — low for business use
- eSignature requires a separate CocoSign account
- Less brand recognition and fewer third-party reviews
- BAA availability not prominently documented
How to Choose a Digital Fax App
The right digital fax app depends on three variables: volume, compliance, and workflow integration.
Step 1: Estimate Your Monthly Page Volume
| Monthly Pages | Recommendation |
|---|---|
| Under 30 pages | Pay-per-fax (mFax.to) or free tier (Fax.Plus) |
| 30–200 pages | Fax.Plus Basic ($6.99) or CocoFax Basic ($9.99) |
| 200–500 pages | mFax Business, iFax Plus, or Fax.Plus Premium |
| 500–1,500 pages | RingCentral Fax, mFax Business, or eFax Pro |
| 1,500+ pages | RingCentral Fax 3000 or enterprise contract |
Step 2: Determine Your Compliance Requirements
HIPAA required? You need a BAA. Full stop. Any app without a signed BAA is a compliance violation for PHI. See our guide to BAA requirements for fax services for details.
No HIPAA required? Standard TLS encryption and SOC 2 certification is sufficient for most business use cases.
Step 3: Check Your Integration Needs
- Cloud storage (Google Drive, Dropbox, OneDrive) → Dropbox Fax, iFax, Fax.Plus
- Unified communications (phone + fax + SMS) → RingCentral
- EHR / practice management integration → mFax Business, eFax Corporate
- Developer API / automation → Fax.Plus Enterprise, CocoFax Business
- Just need to fax from your phone → mFax.to
HIPAA Compliance: What Healthcare Users Must Know
BAA Is Non-Negotiable
Under HIPAA, any vendor that handles Protected Health Information (PHI) on your behalf must sign a Business Associate Agreement (BAA). Using a fax app without a BAA for PHI is a reportable violation — not just a risk, but a legal breach.
Apps that include a BAA (verified):
- mFax Business — BAA on all plans
- eFax Protect / Corporate — BAA available; HITRUST certified on Corporate
- Fax.Plus Enterprise — BAA on Enterprise plan ($79.99/mo)
- iFax Professional+ — HIPAA + SOC 2 + GLBA
- RingCentral — BAA available on request
Apps that do NOT offer a BAA (cannot be used for PHI):
- Dropbox Fax / HelloFax — explicitly no BAA
- MyFax — not HIPAA compliant per their documentation
- FaxZero — free service, no BAA, immediate violation
- MetroFax — no HIPAA support
For a full breakdown of HIPAA-compliant fax services, see our dedicated guide.
What HIPAA-Compliant Faxing Requires
- BAA signed — legal agreement with your fax provider
- Encryption at rest and in transit — AES-256 storage + TLS transmission
- Audit trails — logs of who accessed, sent, or received each fax
- Access controls — role-based permissions and multi-factor authentication
- Minimum necessary standard — only authorized users see PHI
Personal Use vs. Business Use: Side-by-Side
| Need | Personal Choice | Business Choice |
|---|---|---|
| Send a one-off fax | mFax.to — pay per fax | mFax Business trial |
| Fax from iPhone / Android | mFax.to | mFax Business mobile app |
| Receive faxes with a dedicated number | Fax.Plus Basic ($6.99) | mFax Business (from $9/mo) |
| HIPAA-compliant faxing | N/A — consumer apps lack BAA | mFax Business (all plans) |
| Team shared inbox | N/A | mFax Business, RingCentral |
| High-volume (500+/mo) | N/A | RingCentral Fax 1500 ($17.99) |
| Free tier | Fax.Plus (10 pgs) or iFax (5 pgs/mo) | 14-day trials from most providers |
| eSignature included | iFax Plus ($12.49) | iFax Professional |
| International faxing | Fax.Plus Basic | eFax Pro or Fax.Plus Premium |
Frequently Asked Questions
Is online faxing secure?
Yes — all the apps reviewed here use TLS encryption during transmission and AES-256 encryption for stored documents. This makes digital faxing significantly more secure than traditional fax machines, which print documents directly to an unmonitored tray. For healthcare or legal documents, look for apps with HIPAA compliance and SOC 2 certification.
Can I keep my existing fax number when switching to a digital app?
Most providers support number porting — transferring your existing PSTN fax number to their cloud service. Expect a one-time porting fee and a 2–4 week process. Check with your provider before canceling your old service.
What file formats can I send via a digital fax app?
Most apps support: PDF (recommended), Word (.doc, .docx), Excel (.xls, .xlsx), JPG/PNG images, and TIFF. PDF is the safest choice — it preserves formatting exactly and is accepted by all fax services.
How many pages do I actually need per month?
A useful benchmark: a single 1-page tax form is 1 page; a 5-page contract is 5 pages; a 10-page medical referral packet is 10 pages. Most individuals send fewer than 20 pages a month. Small businesses typically use 100–300 pages/mo. Healthcare practices often exceed 500 pages/mo.
Choose Your Digital Fax App Today
Digital fax apps have eliminated every friction point of traditional faxing — no machine, no phone line, no going to the store.
For personal faxing, download the mFax app — upload a PDF or snap a photo, and send in under 2 minutes. Pay per fax or choose a subscription. Over 5 million users and a 4.8-star rating back it up.
For business teams, mFax Business gives you a virtual fax number, HIPAA compliance, team accounts, and a shared dashboard — starting at about $9/mo. Build your own plan with a live calculator: choose the exact seats and pages you need and pay only for what you use. No hardware. No IT setup. Just faxing that works.
Not sure which is right for you? Read our complete guide to the best business fax services or explore how to choose the best fax app for your business.