The Best Fax APIs in 2026

• 26 tools ranked
• Updated Oct 2026
• Researched from official sources
• Compare tools in this directory
• Sponsor this list

We researched fax APIs through official vendor websites, including pricing pages, plan tables, and product documentation. Rankings reflect each product’s core fax capabilities, value for money, and verified features for developers building applications and workflows around electronic fax communications.

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

The full ranking 26 tools, best first

1. 1
   
   Telnyx Fax API 9.4

   Best forHigh-volume developers needing low per-page pricing

   A low per-page REST fax API with inbound, outbound, tracking, and webhook support.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Our Telnyx Fax API verdict → + Compare Visit TelnyxFor vendors Sponsor this spot · #1 · $149/mo →
   9.4/10★★★★★

   Visit Telnyx
2. 2
   
   Phaxio 9.2

   Best forDevelopers needing a feature-rich fax API

   A feature-rich fax API for sending, receiving, tracking, and routing documents.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Our Phaxio verdict → + Compare Visit PhaxioFor vendors Sponsor this spot · #2 · $99/mo →
   9.2/10★★★★★

   Visit Phaxio
3. 3
   
   Faxxing 9.1

   Best forBudget-conscious teams needing a free starting tier

   A practical free-start fax API with inbound support, signed webhooks, and usage-based pricing.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Free plan Our Faxxing verdict → + Compare Visit FaxxingFor vendors Sponsor this spot · #3 · $79/mo →
   9.1/10★★★★★

   Visit Faxxing
4. 4
   
   Sinch Fax API 9.0

   Best forBusinesses wanting a mature programmable fax service

   A mature REST fax API for adding inbound and outbound faxing to business applications.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Our Sinch Fax API verdict → + Compare Visit SinchFor vendors Sponsor this spot · #4 · $69/mo →
   9.0/10★★★★☆

   Visit Sinch
5. 5
   OC
   OpenText Core Fax Management API 8.9

   Best forEnterprise teams needing governance and integrations

   A mature REST and SOAP fax API suite for regulated, integration-heavy teams.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Pricing on request Our OpenText Core Fax Management API verdict → + Compare Visit OpenTextFor vendors Sponsor this spot · #5 · $59/mo →
   8.9/10★★★★☆

   Visit OpenText
6. 6
   
   Documo Fax API 8.8

   Best forHealthcare developers needing high-volume API capacity

   A healthcare-focused REST fax API with inbound, outbound, tracking, and workflow tools.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   14-day trial Our Documo Fax API verdict → + Compare Visit Documo
   8.8/10★★★★☆

   Visit Documo
7. 7
   
   Openfax Cloud Fax API 8.7

   Best forTeams sending broadcasts or mail-merge faxes

   A focused fax API for teams automating single sends, broadcasts, and inbound delivery.

   • Webhook events
   • Inbound faxing
   • Outbound faxing

   Our Openfax Cloud Fax API verdict → + Compare Visit Openfax
   8.7/10★★★★☆

   Visit Openfax
8. 8
   
   FAXAGE 8.6

   Best forSmall businesses needing affordable two-way faxing

   Affordable two-way faxing with API access, flexible minute-based plans, and HIPAA support.

   Our FAXAGE verdict → + Compare Visit FAXAGE
   8.6/10★★★★☆

   Visit FAXAGE
9. 9
   
   ETHERFAX 8.5

   Best forHealthcare enterprises needing AI and redundancy

   A healthcare-focused fax API with AI workflows, integrations, audit trails, and redundancy.

   Pricing on request Our ETHERFAX verdict → + Compare Visit ETHERFAX
   8.5/10★★★★☆

   Visit ETHERFAX
10. 10
    FR
    Faxsuite REST API 8.4

    Best forDevelopers needing REST, SOAP, and sandbox support

    A developer-focused fax API with inbound, outbound, scheduling, and sandbox support.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    28-day trial Our Faxsuite REST API verdict → + Compare Visit Faxsuite
    8.4/10★★★★☆

    Visit Faxsuite
11. 11
    GR
    GoFax REST API 8.3

    Best forTeams needing broad device and business integration

    A paid REST fax API with two-way faxing, tracking, webhooks and six integrations.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    Our GoFax REST API verdict → + Compare Visit GoFax
    8.3/10★★★★☆

    Visit GoFax
12. 12
    
    FAX.PLUS 8.2

    Best forSmall teams wanting broad fax workflows and apps

    A broad fax platform with API access, apps, integrations, and flexible monthly plans.

    Free plan Our FAX.PLUS verdict → + Compare Visit FAX.PLUS
    8.2/10★★★★☆

    Visit FAX.PLUS
13. 13
    
    FaxCore 8.1

    Best forOrganizations needing hybrid or on-premise faxing

    A flexible enterprise fax server for regulated organizations with complex deployment needs.

    Pricing on request Our FaxCore verdict → + Compare Visit FaxCore
    8.1/10★★★★☆

    Visit FaxCore
14. 14
    
    Fax² API 7.9

    Best forAPI users seeking a trial and included monthly pages

    A focused fax API with inbound and outbound workflows, document conversion, and a trial.

    • Inbound faxing
    • Outbound faxing
    • Delivery tracking

    30-day trial Our Fax² API verdict → + Compare Visit Fax² API
    7.9/10★★★★☆

    Visit Fax² API
15. 15
    
    SingleFax API 7.8

    Best forDevelopers wanting flexible prepaid fax options

    A flexible fax API with strong developer tooling, but only 10 pages in its $9.99 monthly entry plan.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    Our SingleFax API verdict → + Compare Visit SingleFax
    7.8/10★★★★☆

    Visit SingleFax
16. 16
    
    SendFax.me Developer API 7.7

    Best forOccasional senders needing simple REST faxing

    Simple pay-as-you-go REST faxing for occasional senders.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    Our SendFax.me Developer API verdict → + Compare Visit SendFax.me
    7.7/10★★★★☆

    Visit SendFax.me
17. 17
    
    Innoport Programmable Fax API 7.6

    Best forEstablished businesses needing configurable fax delivery

    A configurable fax API for businesses that need delivery tracking, retries, and virtual numbers.

    • Inbound faxing
    • Outbound faxing
    • Delivery tracking

    Our Innoport Programmable Fax API verdict → + Compare Visit Innoport
    7.6/10★★★★☆

    Visit Innoport
18. 18
    
    Concord Fax API 7.5

    Best forLegacy SOAP integrations needing two-way faxing

    A mature SOAP-based API for two-way fax workflows with status tracking and push notifications.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    Our Concord Fax API verdict → + Compare Visit Concord
    7.5/10★★★★☆

    Visit Concord
19. 19
    
    mintfax 7.4

    Best forOutbound-only developers needing delivery controls

    A focused REST fax API for outbound delivery control, not inbound faxing.

    • Webhook events
    • Outbound faxing
    • Delivery tracking

    Our mintfax verdict → + Compare Visit mintfax
    7.4/10★★★★☆

    Visit mintfax
20. 20
    
    eFax 7.3

    Best forOrganizations wanting a mature full-service fax product

    A mature full-service fax product with broad access options and enterprise workflows.

    7-day trial Our eFax verdict → + Compare Visit eFax
    7.3/10★★★★☆

    Visit eFax
21. 21
    
    WestFax 7.2

    Best forTeams wanting broad fax access and collaboration tools

    A broad cloud fax service for teams, with API access reserved for Enterprise.

    Our WestFax verdict → + Compare Visit WestFax
    7.2/10★★★★☆

    Visit WestFax
22. 22
    
    HumbleFax 7.1

    Best forSmall users wanting inexpensive unlimited faxing

    Affordable unlimited faxing with web, email, mobile, and API workflows.

    Our HumbleFax verdict → + Compare Visit HumbleFax
    7.1/10★★★★☆

    Visit HumbleFax
23. 23
    
    LuzardoFax API 7.0

    Best forSmall teams needing broad file-format support

    A capable two-way fax API with broad file support and a relatively high entry price.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    14-day trial Our LuzardoFax API verdict → + Compare Visit LuzardoFax
    7.0/10★★★★☆

    Visit LuzardoFax
24. 24
    
    SRFax 6.9

    Best forHealthcare teams needing fax storage and compliance options

    A cloud fax service with healthcare plans, HIPAA compliance, and API access.

    Our SRFax verdict → + Compare Visit SRFax
    6.9/10★★★☆☆

    Visit SRFax
25. 25
    
    Send FAX Mail API 6.7

    Best forDevelopers wanting scheduled sending and webhooks

    A scheduling-focused fax API with webhooks, tracking, and 600 included pages.

    • Webhook events
    • Inbound faxing
    • Outbound faxing

    7-day trial Our Send FAX Mail API verdict → + Compare Visit Send FAX Mail
    6.7/10★★★☆☆

    Visit Send FAX Mail
26. 26
    
    Notifyre 6.0

    Best forSMS teams needing shared inboxes and APIs

    A capable SMS/MMS communications platform, but a poor match for Fax APIs.

    From 0.05 AUD Our Notifyre verdict → + Compare Visit Notifyre
    6.0/10★★★☆☆

    Visit Notifyre

No tools match those filters.

Compare at a glance

#	Tool	Free plan	Paid from	Inbound faxing	Outbound faxing	Delivery tracking	Webhook events	Score
1	Telnyx Fax API	No	$500/mo	Yes	Yes	Yes	Yes	9.4
2	Phaxio	No		Yes	Yes	Yes	Yes	9.2
3	Faxxing	Yes		Yes	Yes	Yes	Yes	9.1
4	Sinch Fax API	No		Yes	Yes	Yes	Yes	9.0
5	OCOpenText Core Fax Management API			Yes	Yes	Yes	Yes	8.9
6	Documo Fax API	No		Yes	Yes	Yes	Yes	8.8
7	Openfax Cloud Fax API	No	$0.03/unit usage-based	Yes	Yes	Yes	Yes	8.7
8	FAXAGE	No	$3.49/unit/mo					8.6
9	ETHERFAX							8.5
10	FRFaxsuite REST API	No		Yes	Yes	Yes	Yes	8.4
11	GRGoFax REST API	No		Yes	Yes	Yes	Yes	8.3
12	FAX.PLUS	Yes	$6.99/mo					8.2
13	FaxCore	No						8.1
14	Fax² API	No		Yes	Yes	Yes		7.9
15	SingleFax API	No	$99/yr	Yes	Yes	Yes	Yes	7.8
16	SendFax.me Developer API	No	$10 one-time	Yes	Yes	Yes	Yes	7.7
17	Innoport Programmable Fax API	No	$19.95/mo	Yes	Yes	Yes		7.6
18	Concord Fax API			Yes	Yes	Yes	Yes	7.5
19	mintfax	No	$0.04/unit usage-based	No	Yes	Yes	Yes	7.4
20	eFax	No						7.3
21	WestFax	No	$14.99/mo					7.2
22	HumbleFax	No	$10/mo					7.1
23	LuzardoFax API	No	$25/mo	Yes	Yes	Yes	Yes	7.0
24	SRFax	No	$10.70/mo					6.9
25	Send FAX Mail API	No	$12.99/mo	Yes	Yes	Yes	Yes	6.7
26	Notifyre	No						6.0

Head-to-head All 28 comparisons →

• Telnyx Fax API vs Phaxio
• Telnyx Fax API vs Faxxing
• Telnyx Fax API vs Sinch Fax API
• OCTelnyx Fax API vs OpenText Core Fax Management API
• Telnyx Fax API vs Documo Fax API
• Telnyx Fax API vs Openfax Cloud Fax API
• Telnyx Fax API vs FAXAGE
• Phaxio vs Faxxing
• Phaxio vs Sinch Fax API

How we rank fax APIs

Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated 10 Oct 2026 · How we research and update