Software advice
Best AI Online Fax Services in 2026
AI online fax services are cloud products that send and receive faxes through a browser, email, app or API instead of a fax machine, and some add AI to read, sort or extract data from incoming pages. They are not telephone systems, e-signature tools or general document scanners, although several bundle those.
Quick answer
Fax.Plus ranks first for printed prices, a free trial and named AI features. Documo fits clinics that want HIPAA on every plan and AI sorting of incoming faxes. Phaxio and Telnyx Fax fit teams that want to pay per page.
Fax is still the format for medical referrals, legal notices and some government paperwork, so buyers keep searching for a service that does not need a phone line. The choice is rarely about sending a page. It is about who needs a HIPAA agreement, whether pages are billed by the page, the minute or the seat, and whether any AI sits on the inbound side. We read vendor pages in November 2026 and ran none of these services, so speed and delivery rates remain the vendors' own claims. Only a few name a concrete AI feature, so we rank on prices, limits, data statements and clarity.
The 13 best AI online fax services in 2026, ranked
There is no score. 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. How we rank.
| # | Tool | Best for | Free plan | Entry price |
|---|---|---|---|---|
| 1 | Fax.Plus | Individuals and small teams that want a printed price ladder, an API and an AI assistant route. | Yes | Free (10 free pages in total) |
| 2 | Documo | Healthcare offices and clinics that want HIPAA on every plan and AI sorting of incoming faxes. | Trial | $25 a month billed annually (Solo) |
| 3 | WestFax | Small practices and offices that want a signed business associate agreement on every plan. | No | $14.99 a month billed monthly (Solo) |
| 4 | iFax | Mobile-first senders who want apps on every platform and tools such as OCR and eSign. | No | $12.49 a month (Basic) |
| 5 | Phaxio | Teams that want fax by the page with no seat fee or monthly minimum. | No | 7 cents per page (US and Canada) |
| 6 | Telnyx Fax | Engineering teams that already use Telnyx numbers and want fax through the same API. | No | $0.007 per page |
| 7 | Nextiva vFax | Businesses that want a low flat monthly fee and a pooled page allowance. | No | From $7.95 a month (Essential) |
| 8 | RingCentral Fax | Companies that already run, or want, a cloud phone system with fax included. | Trial | $20 per user a month (Core, annual) |
| 9 | FAXAGE | Small offices and resellers that want per-line pricing with unlimited inbound faxes. | No | $3.49 a month per line (Lite) |
| 10 | FaxBurner | People who need to send an occasional fax from a browser or phone. | Yes | $0 (Free plan) |
| 11 | faxB2B | Small sales and admin teams that want a shared inbox with an audit log. | Trial | $15 per seat a month (Team) |
| 12 | SRFax | Canadian and US healthcare buyers who need PHIPA or HIPAA wording and a business associate agreement. | No | Quoted |
| 13 | FaxZero | Someone sending a single short document to a US or Canadian number. | Yes | Free (no account, no credit card) |
- 1
Fax.Plus takes first place because every step from a free trial to a 4,000-page Enterprise plan has a printed price, and the page names AI Faxing through MCP plus AI text extraction. The privacy policy also says customer data does not train general AI models. Buyers who need HIPAA must jump to Enterprise, which keeps it from being a clean win for clinics.
Strong on
- Five plans with printed monthly and annual prices, including a free ten-page trial.
- Names an MCP route for AI assistants and AI text and data extraction.
- Privacy policy states customer data does not train generalized AI or machine learning models.
Weak on
- The business associate agreement for HIPAA work is on the Enterprise plan only.
- Free tier gives ten pages in total, so it only works as a short trial.
Skip it if: Clinics that need a HIPAA agreement without moving to the highest plan. Free is a ten-page trial; paid plans start at $6.99 a month, shown in four currencies.
- 2
Documo ranks second because HIPAA is stated as standard on every plan and the home page describes AI that classifies documents, extracts details, matches patients and flags what is missing. Fixed tiers from $25 to $300 a month make budgeting easy. The intelligence tiers are quote only, and the vendor pages name no headquarters country.
Strong on
- HIPAA compliance is stated as standard on every plan, from Solo upward.
- AI classifies faxes, pulls out information and matches patients to records.
- Three fixed tiers have printed monthly prices and per-page overage rates.
Weak on
- Document intelligence and EHR integration are quoted per customer, with no published price.
- The pages we read name no headquarters country or hosting region.
Skip it if: Individuals who send a few faxes a year and want a free tier. Solo is billed annually and covers 300 pages and one user; intelligence tiers are quoted per customer.
- 3
WestFax sits third. The pricing page promises a signed business associate agreement on every plan, and the home page names an AI extraction product that turns inbound documents into structured data. Prices are printed for Solo and Team, with a quote for Enterprise. The steeper entry price than the free-tier tools and the missing data-training statement hold it below the first two.
Strong on
- Signed business associate agreement is stated on every plan.
- Printed prices for Solo and Team, with 3 cents per extra page.
- Fax API with REST and webhooks, plus a toolkit for on-premises systems.
Weak on
- Entry price is higher than several tools with free or pay-per-page options.
- Pages we read do not say whether customer data trains AI models.
Skip it if: Hobby users who fax once a month and want a free route. Solo covers 500 pages and one user license; each extra page costs 3 cents.
- 4
iFax ranks fourth. It offers apps for iOS, Android, Windows and Mac, OCR, annotation and signing tools, and a long integration list including HubSpot and Zapier. The home page lists Fax AI and Smart Templates, but we did not open that product page, so the AI claim stays thin. Plans are priced for two tiers only, and Pro shows no price.
Strong on
- Apps for four platforms plus OCR, annotate and eSign tools in one product.
- Integrations named for Microsoft 365, Google Workspace, HubSpot, Dropbox and Zapier.
- Plus plan carries HIPAA wording and a dedicated number.
Weak on
- Basic sends faxes only, so receiving needs the higher Plus plan.
- Fax AI is listed on the home page without details we could confirm.
Skip it if: Teams that need a published price for a high-volume tier. Basic allows 200 pages and sending only; receiving and HIPAA wording start on the Plus plan.
- 5
Phaxio takes fifth place as the plain pay-per-page option: 7 cents in the US and Canada, 10 cents abroad, and numbers at $2 a month. Volume discounts apply automatically. The pages we read name no AI feature, no certification and no hosting region, so it suits developers who bring their own logic more than offices that want built-in tools.
Strong on
- Per-page prices of 7 cents and 10 cents are printed with no contract.
- Volume rates of 5 and 4 cents apply automatically after a monthly check.
- Numbers cost $2 a month in the US and Canada.
Weak on
- No AI feature or compliance certification is named on the pages we read.
- Phone numbers are limited to the US and Canada.
Skip it if: Buyers who want an app, a shared inbox or a HIPAA agreement. Pay per page with no contract; 5 cents at 50,000 pages a month and 4 cents at 100,000.
- 6
Telnyx Fax is sixth: at $0.007 per page it is the cheapest unit price in this ranking, with no monthly fee and a machine-readable price list. Its footer names ISO, PCI, HIPAA, GDPR and SOC 2 Type II. It is an API product, so there is no inbox app, and the fax pages name no AI feature.
Strong on
- Lowest printed unit price in this list at $0.007 per page.
- Prices are also published in a machine-readable endpoint for developers.
- Site footer names ISO, PCI, HIPAA, GDPR and SOC 2 Type II.
Weak on
- Built for developers, so staff get no fax inbox, app or print driver from the fax pages.
- Carrier passthrough and taxes change the final bill by destination.
Skip it if: Office staff who want to log in and send a fax without code. Pay as you go with no monthly or platform fee; carrier passthrough and taxes vary by destination.
- 7
Nextiva vFax ranks seventh. Essential at $7.95 and Pro at $13.95 a month pool pages across sending and receiving, and failed faxes do not count against the pool. A HIPAA-compliant version exists on request. The pages we read name no AI feature for vFax and no developer API, which keeps it behind the tools that automate documents.
Strong on
- Low entry price with one shared page pool for both directions.
- Failed faxes do not use up the page allowance.
- A HIPAA-compliant option is available on request by quote.
Weak on
- No AI feature or API is named for vFax on the pages we read.
- The HIPAA-compliant version has no published price on the pages.
Skip it if: Developers who need an API or buyers who want AI document handling. Pages are one pool for inbound and outbound faxes; annual billing saves 20 percent.
- 8
RingCentral Fax lands eighth because fax is a feature of the RingEX communications suite, so the printed $20 per user buys much more than a fax line. The page calls RingEX AI-powered but names no fax-specific AI, and per-plan fax inclusion was not confirmed. It fits firms that want one vendor for phone and fax.
Strong on
- Fax sits inside one suite together with calling, meetings and messaging.
- Faxes can be sent by email, PC or mobile app, with Dropbox and Google Drive links.
- Developer APIs from RingCentral include fax, so software can send faxes.
Weak on
- Pricing is per user for the whole suite, so a fax-only buyer overpays.
- The pages we read do not confirm fax allowances per plan.
Skip it if: Buyers who only need a standalone fax number at a low price. Fax is part of the RingEX suite, so the price buys a full phone system, not fax alone.
- 9
FAXAGE is ninth. Its per-line plans are cheap and detailed, from a $3.49 Lite line to a $64.95 Volume plan with unlimited inbound faxes, and every plan includes web, email and API faxing. Billing by the minute differs from the per-page norm. The pages we read name no AI feature, no hosting region and no certificate.
Strong on
- Five line-based plans with printed fees and overage rates.
- Web, email-to-fax, fax-to-email and API faxing on every one of the plans.
- Number portability is advertised across more than 137,000 exchanges.
Weak on
- Minute-based billing is harder to forecast than per-page billing.
- No AI feature or certification is named on the pages we read.
Skip it if: Buyers who want page-based pricing, AI document tools or a clearly stated hosting region. Lite adds $0.05 per minute and a $5.00 setup fee per line; higher tiers bundle minutes.
- 10
FaxBurner ranks tenth among the thirteen. The free plan sends five pages in total and receives 25 a month on a 24-hour disposable number, and paid plans of $14.95 and $24.95 add a permanent toll-free number. The pricing page says it is not HIPAA compliant at this time, and faxes go to the US and Canada only.
Strong on
- Free plan includes email-to-fax and fax-to-email with a temporary number.
- Cover sheet templates in Word, PDF and Google Docs formats.
- Paid plans add a permanent toll-free fax number.
Weak on
- The pricing page says the service is not HIPAA compliant at this time.
- Sending is limited to the United States and Canada.
Skip it if: Healthcare offices, or anyone who needs to fax outside the United States and Canada. Free sends five pages in total and receives 25 a month on a number that lasts 24 hours.
- 11
faxB2B is eleventh. Team costs $15 per seat a month, with fill-and-sign, version history, roles, two-factor sign-in and an audit log. It also says plainly that no SOC 2 or ISO 27001 has been completed and that the service should not carry protected health information. Few vendors state that, but it rules out clinics. The pages name no maker and no AI feature.
Strong on
- Shared inbox, delivery receipts and an audit log on Team.
- Camera scan in the browser plus fill, sign and version history.
- The security page states its certification status directly.
Weak on
- The vendor says not to use it for protected health information.
- Receiving works on US and Canadian numbers only.
Skip it if: Healthcare or legal teams that handle regulated records or patient files. Team shares 150 pages per seat; the 14-day trial gives 25 pages and up to 3 seats.
- 12
SRFax is twelfth of thirteen. The security page names HIPAA in the US and PHIPA guidelines in Canada, offers a business associate agreement and optional PGP encryption, and the service supports an API. No prices appear on the pages we read, and the maker and AI features go unnamed, so a buyer must request a quote.
Strong on
- Healthcare plan names HIPAA and PHIPA with a business associate agreement.
- Optional PGP encryption is offered on top of SSL.
- Scheduling of up to 50 recipients at a time on Standard.
Weak on
- No prices are printed, so every comparison needs a quote.
- Support runs Monday to Friday, 6 am to 5 pm Pacific.
Skip it if: Buyers who want to compare prices before talking to anyone. Standard and Healthcare plans are quote only; the pages we read show no price figures.
- 13
FaxZero closes the list. It sends up to three pages free with no account, five a day, with FaxZero branding on the cover. A $3.29 fax raises the limit to 25 pages and removes the branding. That is useful for one-off needs and unsuitable for receiving, teams, storage or anything regulated. No AI feature, certification or API is named.
Strong on
- No account or credit card is needed to send a free fax.
- Accepts DOC, DOCX and PDF files as attachments.
- The $3.29 option lifts the limit to 25 pages and removes branding.
Weak on
- Free faxes carry FaxZero branding and stop at 3 pages plus a cover.
- No receiving, inbox, API or team features are named.
Skip it if: Anyone who needs a fax number to receive documents or a business workflow. Free faxes run 3 pages plus cover and 5 a day; the paid option is $3.29 per fax.
How these AI online fax services were judged
Which online fax services include real AI features?
A minority do. Fax.Plus names AI Faxing through MCP so an AI assistant can send faxes, plus AI text and data extraction. Documo describes AI that classifies documents, extracts information, matches patients and flags what is missing. WestFax names an extraction product that turns inbound documents into structured data. iFax lists Fax AI and Smart Templates on its home page, though we did not open the product page. InterFAX also lists an AI section but is left out of this ranking for lack of a usable logo. Everyone else sells transmission only, which is a legitimate product, so a missing AI line is not treated as a flaw here.
How do online fax services charge, and what is cheapest?
Three billing models appear. Per page: Phaxio at 7 cents, Telnyx Fax at $0.007, and a few cents for extra pages elsewhere. Per user or plan with a page allowance: Fax.Plus from $6.99 a month, Nextiva vFax from $7.95, iFax from $12.49, WestFax from $14.99, faxB2B at $15 per seat, Documo from $25. Per line with minutes: FAXAGE from $3.49. RingCentral Fax is priced per user for a whole phone suite. SRFax prints no prices. Always count pages per month, extra-page rates and number fees before comparing.
Which fax services handle health data and AI training properly?
Look for a signed business associate agreement, not a badge. Documo states HIPAA as standard on every plan, WestFax states a signed agreement on every plan, and Fax.Plus restricts its agreement to Enterprise. SRFax offers one on its Healthcare plan, while faxB2B and FaxBurner both say they are not suitable for regulated records. On AI training, only Fax.Plus states in its privacy policy that customer data is not used to train generalized models. Most other pages we read were silent on training, retention and hosting region, so ask before sending patient records.
How hard is it to move a fax number between providers?
The number is the lock-in. FAXAGE advertises porting across more than 137,000 exchanges, and WestFax charges a one-time $20 fee per ported number. Fax.Plus, iFax and SRFax mention keeping an existing number. Because a ported number can take days, keep the old line active until the new one receives a test fax. Usage-billed services such as Phaxio and Telnyx Fax tie you less to an inbox but more to your own code, so isolate the fax call behind one function. Check what happens to stored faxes at cancellation, because few pages say.
Which online fax service fits which kind of buyer?
A solo user sending once a quarter can stay on FaxZero or the Fax.Plus free trial. A clinic should start with Documo, WestFax or SRFax, and ask each for the agreement in writing. A software team that embeds fax should compare Telnyx Fax, FAXAGE and the Fax.Plus API, with Phaxio for pure per-page pricing. A company already paying for a cloud phone system may find RingCentral Fax or Nextiva vFax cheaper than a separate service. Multi-user offices want shared inboxes, roles and audit logs, which faxB2B describes and Fax.Plus sells on its five-member Business plan.
How to choose an AI online fax services in three steps
- Count pages, numbers and users first. Add up pages sent and received in a typical month, the number of fax numbers you need, and how many people will log in. Then price each candidate on those figures, including the extra-page rate and any number or setup fees. A plan that looks cheap at 200 pages can cost more than a pay-per-page service once your volume rises. Use the printed overage rate, not the headline price, when you compare, and write the total next to each name.
- Ask for the compliance paper, not the badge. If a fax can contain health, legal or financial data, request the business associate agreement or equivalent contract before you pay. Ask which plan includes it, where data is hosted, how long faxes are stored and whether customer documents ever train AI models. Write the answers down and keep them with the contract. Vendors that print this on the pricing page save you the call, and vendors that say a service is unsuitable for regulated data are telling you something useful before you have uploaded anything.
- Test number porting and one real fax. Run a trial with a real document and a recipient who still uses a machine, because rendering and delivery are where services differ. If you are moving a number, ask how long porting takes and keep the old line live until a test fax arrives. For an API service, send a failed fax on purpose and confirm that the webhook reports the error the way your code expects. Then check how the failed attempt appears on the bill, and whether a retry counts as a second page.
Frequently asked questions
What is the best AI online fax service in 2026?
Fax.Plus ranks first in our list because it prints five plan prices, offers a free ten-page trial, names AI Faxing through MCP and states that customer data does not train generalized AI models. Documo is the pick for clinics that want HIPAA on every plan, and Phaxio or Telnyx Fax suit teams that want to pay per page.
Do online fax services really use AI?
Only some do. Fax.Plus, Documo and WestFax describe AI features for reading or extracting data from faxes, and iFax lists a Fax AI product we could not confirm in detail. The rest sell transmission, storage and an inbox. In November 2026 we judged this from vendor pages only and did not test accuracy.
Is online fax HIPAA compliant?
It depends on the vendor and the plan. Documo states HIPAA as standard on every plan, WestFax states a signed agreement on every plan, and Fax.Plus limits its agreement to Enterprise. FaxBurner and faxB2B say they are not suitable for protected health information. Request the agreement in writing before sending patient records.
What is the cheapest way to send a fax online?
For one fax, FaxZero is free for up to three pages and $3.29 for a longer one. For volume, Telnyx Fax charges $0.007 per page and Phaxio 7 cents. For a regular small plan, Fax.Plus Basic is $6.99 a month for 200 pages. Check destination limits and fees first.
Can I keep my existing fax number?
Most paid services let you port a number. FAXAGE advertises portability in more than 137,000 exchanges, and WestFax charges a one-time $20 fee per number. Porting can take days, so keep the old line active until the new service receives a test fax from a real sender.
Do I need an API for online fax?
Only if software sends or receives faxes for you. Fax.Plus, Documo Business and above, WestFax, FAXAGE and Telnyx Fax describe programmatic access, while FaxBurner and FaxZero do not. A person using a browser or email needs none of it, so do not pay for developer tiers by default.
How long do online fax services keep my faxes?
Most pages we read did not say. FAXAGE names unlimited online fax storage at no extra charge, while Phaxio and FAXAGE policies mention keeping records as long as needed or required by law. For a retention period you can rely on, ask the vendor and put it in the contract.
Can I send faxes outside the US and Canada?
It depends on the service. Phaxio lists international rates and supported countries, some marked beta, and faxB2B names European Union destinations. FaxBurner sends only to the United States and Canada, and FaxZero names international sending without detail. Confirm the country list before relying on one.