Vendors can pay for more visibility on this website, for example a higher place in a ranking or more room on a page. Commercial relationships can also affect which products we feature and how prominently. Every vendor link is marked the same, whatever the arrangement behind it. The largest vendors in online fax services
cannot hold places 1 to 3. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category,
wherever the category has them; the established names follow from place 4 in their ranked order. How it works: placement disclosure ·
editorial process.
The 14 tools, reviewed
#1 WestFax
Cloud fax for healthcare offices and developers · United States · westfax.com
HIPAA Fax API Healthcare
WestFax leads because a buyer can read almost everything that matters before talking to anyone: plan prices, page allowances, the overage rate, the number porting charge and the company's registered street address in Colorado.
- Pricing: Per plan / month. Solo is $14.99 a month with 500 pages, one user and one number, then 3 cents per extra page. Free plan: none.
- Best for: Clinics and developers needing HIPAA fax
- Strengths: HIPAA compliance with BAA; Send and receive fax; Fax API (REST and webhooks).
Where it falls short
Solo allows one user and one number, so a growing team is pushed to Team within months. The overage rate is cheap per page but unbounded.
Wrong for
A buyer who sends a few faxes a year, or a team outside North America that wants local numbers in many countries.
Visit WestFax →
#2 Telnyx Fax API
Per-page fax API on a private IP network · United States · telnyx.com
API Per page T.38
Telnyx takes second place as the cleanest build-it-yourself option. The page states a per-page starting price, documents hard file limits (50 MB and 350 pages), and exposes protocol choices that fax engineers care about: T.38 or G.711 pass-through, plus three resolution settings.
- Pricing: Usage-based. Pay per page from $0.007 in USD. Free plan: free trial.
- Best for: Developers sending fax from software
- Strengths: Encrypted signaling and media; Fax to email; Quality routing to Tier-1 partners.
Where it falls short
There is no portal for office staff to drag a PDF into, so a human inbox has to be built or bought elsewhere. Files over 50 MB or 350 pages fail outright.
Wrong for
An office manager without a developer, or a clinic that wants a ready-made inbox with a signed compliance agreement.
Visit Telnyx Fax API →
#3 Faxage
Internet fax with three published volume tiers · United States · faxage.com
Email fax API HIPAA
Faxage earns third place for plain pricing. It publishes three tiers and tells you how many faxes each is meant to carry, so a buyer can match volume to price in a minute, and the lowest tier is the lowest published entry price we found.
- Pricing: Per tier. Three tiers are shown: Individual from $3.49, Business at $19.95 and Volume at $64.95. Free plan: none.
- Best for: Small offices wanting a low published price
- Strengths: Email fax; Online fax; API fax.
Where it falls short
Coverage is limited to the 50 US states and Canada, so international senders need another product.
Wrong for
A company that needs numbers in Europe or Asia, or a buyer who wants a free trial before committing.
Visit Faxage →
#4 Fax.Plus
International online fax with AI extraction · Switzerland · fax.plus
International Broadcast AI
Fax.Plus ranks fourth because it is the strongest option for international work.
- Pricing: Per plan. Individual plans start at $6.99 and Enterprise at $79.99, both with the billing period unstated. Free plan: none.
- Best for: Teams faxing across many countries
- Strengths: AI transcript and data extraction; Print-to-fax for Windows and macOS; Local, toll-free and international numbers.
Where it falls short
The billing period behind the published prices is not stated, the legal entity does not appear on the pages we opened, and we did not see a free trial.
Wrong for
A healthcare office that needs a signed HIPAA agreement up front, or a buyer who wants one flat price.
Visit Fax.Plus →
#5 SRFax
Encrypted email-to-fax for healthcare and small offices · Canada · srfax.com
Encrypted HIPAA PHIPA
SRFax is the pick for Canadian practices and for anyone who cares about stating encryption and privacy terms in plain language.
- Pricing: Per plan / month. Plans sit behind a Find a Plan link and custom needs are quoted. Free plan: none.
- Best for: Canadian and US clinics
- Strengths: End-to-end encryption; HIPAA and PHIPA guidelines; Email-to-fax.
Where it falls short
No price is visible on the page we opened, so a comparison needs a click-through or a call.
Wrong for
A buyer who needs weekend support or a price comparison before talking to sales, and any developer wanting per-page billing.
Visit SRFax →
#6 iFax
App-first online fax with OCR and team inbox · United States · ifaxapp.com
Mobile app OCR Team inbox
iFax comes sixth: a polished, app-led product with enough business features to run a small team. It offers a shared team inbox, OCR on received faxes, broadcast, automation rules, in-document annotation and signing, and templates for forms sent repeatedly.
- Pricing: Per plan / month. BASIC is $12.49 a month for 200 pages and PLUS is $24.99 for 500, billed annually. Free plan: free plan.
- Best for: Mobile-first small teams
- Strengths: Email to fax; Fax OCR; Team inbox.
Where it falls short
Prices are tied to annual billing, and the PROFESSIONAL price is not displayed. The free offer's limits are not stated on the page.
Wrong for
A high-volume office that wants thousands of pages a month at a fixed fee, or a developer who wants a deep API.
Visit iFax →
#7 Nextiva vFAX
Business fax that keeps your existing number · United States · nextiva.com
Keep your number Fax to email HIPAA plan
Nextiva vFAX is a sensible middle option for an office that wants the number it already has to keep working. Two plans carry published prices and page pools, the portal is central, and incoming faxes can be routed and delivered to email with text alerts.
- Pricing: Per plan / month. Essential is $7.95 a month for 500 pages and Professional is $13.95 for 1,000, shown on annual billing and shared between sent and received pages. Free plan: none.
- Best for: Offices keeping existing fax numbers
- Strengths: 256-bit SSL encryption; Central online portal; Keep your current number.
Where it falls short
The page gives no free trial for vFAX; the only trial it mentions is for another Nextiva product.
Wrong for
A developer needing an API or a buyer who wants a free trial before purchase.
Visit Nextiva vFAX →
#8 Documo
Healthcare document intake built around cloud fax · Not stated by the vendor · documo.com
Healthcare Workflow IDP
Documo is the most ambitious product here, which is why it appears at eighth rather than lower: the fax is only the entry point. The vendor describes classification of incoming documents, routing into workflows, electronic signatures, Direct Secure Messaging and a cloud fax API aimed at healthcare receivers.
- Pricing: Quote only. No prices are shown on the page. Free plan: free trial.
- Best for: Hospitals and clinics routing incoming documents
- Strengths: Cloud fax; Intelligent document processing; Workflow automation.
Where it falls short
Pricing is withheld, so a small buyer cannot compare costs. The company's headquarters and legal name are not stated on the pages we opened, and the free trial has no stated length.
Wrong for
A small business that wants a self-serve plan with a visible price.
Visit Documo →
#9 Phaxio
Pay-as-you-go fax API for developers · Not stated by the vendor · phaxio.com
API Pay as you go Developers
Phaxio fits a narrow but common need: your application needs to send and receive fax and you want nothing else. The pricing is a per-page rate with no monthly contract, and the API accepts a document by URL or an HTML string, with batching and collision avoidance for busy sending.
- Pricing: Usage-based. Pay as you go from 7 cents per page for sending and receiving, with volume discounts and no monthly contract. Free plan: none.
- Best for: Developers wanting simple per-page fax
- Strengths: JSON API; Send and receive fax; Batching.
Where it falls short
The page states no limits, no free trial and no legal entity; its about page returned a not-found error when we opened it.
Wrong for
Anyone who needs an office portal or a signed healthcare agreement.
Visit Phaxio →
#10 FaxBurner
iPhone-friendly fax with a free tier · Not stated by the vendor · faxburner.com
Free plan iPhone app Toll-free
FaxBurner is the easiest way to send a signed form from a phone. The app turns a photo into a fax, stores your signature, and keeps inbox and outbox apart; the free plan is explicit about its limits.
- Pricing: Per plan / month. Free is $0 with 5 pages sent in total, 25 received per month and a number that lasts 24 hours. Free plan: free plan.
- Best for: Occasional senders on iPhone
- Strengths: Email-to-fax and fax-to-email; iPhone and iPad app; Stored signatures.
Where it falls short
The free number lasts 24 hours and only 5 pages can be sent in total, so it is a trial, not a working fax line.
Wrong for
A clinic, a law office or any team that must show compliance terms or share an inbox.
Visit FaxBurner →
#11 faxB2B
Browser fax with delivery receipts for teams · Not stated by the vendor · faxb2b.com
Browser-based Receipts US numbers
faxB2B is notable for how plainly it states what it will not do. It says it is not offered to customers in the EEA or the UK, that receiving works only on US and Canadian numbers, that receipts prove carrier delivery rather than reading, and that faxes cross the phone network unencrypted.
- Pricing: Quote only. A free trial is offered for the whole team, with length unstated. Free plan: free trial.
- Best for: Small US business teams
- Strengths: Online sending from PDF, PNG and JPEG; Camera scanning with crop and rotate; Edit, draw and signature tools.
Where it falls short
No price is shown on the page we read, so cost is unknown until sign-up. European and British customers are excluded, and receiving is limited to US and Canadian numbers.
Wrong for
Any company in the EEA or UK, or an office needing a numbered inbox in Europe.
Visit faxB2B →
#12 FaxZero
Free web form for occasional outgoing faxes · Not stated by the vendor · faxzero.com
Free Send only No account
FaxZero is a utility, not a fax platform, and it is useful on that basis. You fill in a web form, attach a DOC, DOCX or PDF, and the page goes out, free for up to 3 pages and 5 faxes a day within the US and Canada.
- Pricing: Per fax. Free sends up to 3 pages plus cover, 5 faxes a day, to the US and Canada. Free plan: free plan.
- Best for: One-off senders needing no account
- Strengths: Free fax to the US and Canada; DOC, DOCX and PDF attachments; Optional text cover page.
Where it falls short
No inbox, no dedicated number and no team features appear on the page, and the free version limits pages and daily volume.
Wrong for
Anyone who receives faxes, needs an audit trail or sends more than a few pages a week.
Visit FaxZero →
#13 RingCentral Fax
Fax add-on inside the RingCentral platform · United States · ringcentral.com
Add-on Broadcast Fax logs
RingCentral Fax is a reasonable convenience for a company that already runs its phones and meetings on the platform, and it is marked major, so it cannot hold a top-three place.
- Pricing: Quote only. The fax page describes low monthly fees and routes to sales; no figures appear on the page we read. Free plan: none.
- Best for: Existing RingCentral customers
- Strengths: Send and receive from PC, email or app; Email-to-fax; Custom cover pages.
Where it falls short
The page we read shows no price, so you must ask sales. Porting an existing number requires a technical expert, according to the vendor.
Wrong for
A buyer who is not already on RingCentral, or one who wants a published price.
Visit RingCentral Fax →
#14 Dropbox Fax
Former HelloFax, now inside the Dropbox family · United States · fax.dropbox.com
Add-on Integrations Porting
Dropbox Fax, formerly HelloFax, has a clean, well-known interface and works easily with Dropbox, Google Drive, Box, OneDrive and Evernote, so received faxes can drop straight into the folder a team already uses. It offers multiple numbers and users with inbound routing, number porting, editing and signing, and an API.
- Pricing: Per plan / month. The page shows an offer of 300 fax pages for $5 in the first month, currency not named. Free plan: none.
- Best for: Dropbox Sign and Dropbox users
- Strengths: Encrypted transmission; Multiple numbers and users; Inbound routing.
Where it falls short
Standard plan prices were not visible on the page we read, only a first-month offer of 300 pages for $5.
Wrong for
A buyer who needs HIPAA terms, European numbers or a visible long-term price.
Visit Dropbox Fax →
Questions and answers
What is the best online fax service in 2026?
WestFax ranks first of 14, best for clinics and developers needing HIPAA fax. Telnyx Fax API is second (developers sending fax from software) and Faxage third (small offices wanting a low published price). Places 1 to 3 go to challengers, vendors outside the best-known brands, wherever the category has them.
How much does an online fax service cost per month?
Published entry prices on the pages we read range from $3.49 at Faxage and $6.99 at Fax.Plus to $14.99 at WestFax Solo, with Nextiva vFAX at $7.95 and iFax BASIC at $12.49.
Is online faxing HIPAA compliant?
Only if the vendor offers it and you sign the right paperwork. Faxage, WestFax, iFax, SRFax and Nextiva (on its HIPAA plan) mention HIPAA, and WestFax states a business associate agreement.
Can I keep my existing fax number?
Usually yes, through number porting, but the terms vary.
Do I need a fax API instead of a fax portal?
Choose an API when software generates or receives the faxes: an application sending lab results, a claims tool, an invoicing system. Telnyx, Phaxio and WestFax publish APIs, and Fax.Plus, Faxage, iFax, Dropbox Fax and Documo mention them too.
Are there free online fax services?
Two products in our list publish a free allowance with limits. FaxBurner's free plan lets you send 5 pages in total and receive 25 pages a month on a number that lasts 24 hours.
Can I receive faxes by email?
Yes, this is the main reason offices switch. Faxage, FaxBurner, Nextiva vFAX, Telnyx and Dropbox Fax all describe delivering incoming faxes by email or as PDFs, and the faxes arrive as PDFs.
Which fax services work outside the United States?
Coverage differs sharply.
What is the difference between Documo and a basic fax portal?
Documo positions fax as the front door to healthcare document handling: it adds intelligent document processing, workflow automation, electronic signatures and Direct Secure Messaging on top of cloud fax.
How reliable is online faxing compared with a machine?
The failure points move rather than vanish. Vendors state uptime and delivery figures, for example WestFax cites a 99.999% uptime SLA and Documo cites 99.9% uptime and a 99.8% delivery rate, but those are vendor claims.
Should I choose a large platform's fax add-on?
Only if consolidation is worth more than price clarity. RingCentral Fax and Dropbox Fax are tidy if you already use those platforms, but RingCentral's fax page does not show a price and Dropbox's shows only a first-month offer.
