Fax API Providers

Top 7 Fax API Providers in 2024: Best for Developers

Fax API lets software developers build applications that send and receive faxes using a fax server. When you work with top fax API providers, you get a programmable API that’s secure, compliant, and full of useful features.

This list features the best fax API providers to help you transform any software into an online fax machine.

iFax Fax API

1. iFax

iFax’s developer-friendly and programmable APIs help integrate top-tier faxing features into any software or business application. You can create, resend, cancel, and delete a fax. You can also view fax statuses and manage fax numbers, including sending, purchasing, and deleting existing numbers.


  • Fax OCR
  • Mobile fax
  • Fax broadcasting
  • Email to Fax
  • eSignatures
  • Contact management
  • Local and vanity fax numbers
  • Toll-free fax numbers
  • Fax number porting


  • Basic: $8.33 per month for 200 pages
  • Plus: $16.67 per month for 500 pages
  • Pro: $25 per month for 1,000 pages and Fax API access


  • Programmable API with code samples and documentation
  • Military-grade security and HIPAA compliance
  • Dedicated support and scalable features
  • Easy to set and user-friendly interface
Top 7 Fax API Providers in 2024: Best for Developers

2. Fax.to

Fax.to uses REST API to integrate fax sending and receiving requests with any software. You can also use the fax API to generate previews, display fax history, and show cash balance. You can also use the API to request the deletion of an uploaded file.


  • High-volume faxing
  • SSL security
  • Multiple integrations


  • Pay-as-you-go at $0.10 per page with discounts for high-volume faxing


  • No monthly contracts or limits
  • Use SSL to safeguard communications
  • HIPAA and GDPR-compliant


  • No live chat customer support
Top 7 Fax API Providers in 2024: Best for Developers

3. Telnyx

Telnyx offers a global SIP trunking infrastructure and multi-cloud network architecture to ensure successful fax deliverability. All communications are encrypted using a private global IP network, which goes through a private MPLS fiber backbone. 


  • Fax to email
  • Enhanced security
  • Quality routing
  • Customizable fax resolution
  • Protocol choice


  • Pay-as-you-go at $0.007 per page, includes SIP Trunking usage
  • Discounts are available with volume-based faxing. 


  • Send and receive faxes on any of their global private IP network
  • Enjoy advanced error correction features
  • In-depth API reference


  • Expensive pricing
Top 7 Fax API Providers in 2024: Best for Developers

4. RingCentral

RingCentral is well-known for offering a complete communication suite that includes voice, SMS, video, and fax. They have a one-stop developer portal that gives access to various APIs for these different functions. You can build your own app or use a prebuilt one for your needs.


  • Send and receive faxes within the app
  • Customizable fax covers
  • Automated fax workflows


  • Their Advanced plan at $35 per month gives you access to API with internet fax capabilities.


  • SDKs are available in 11 languages, including C#, Java, and PHP
  • Offers a professional team who can build the app you need
  • In-depth API reference and complete tutorials


  • May be too broad for specific faxing needs
Top 7 Fax API Providers in 2024: Best for Developers

5. WestFax

WestFax is known for its security features, which protect data at rest and transit using the latest encryption technology. This extends to its fax API, which lets you download and mark faxes as read from any software. 


  • Print to fax
  • Email to fax
  • Mobile apps


  • Fax API is available with an enterprise plan, which comes with custom pricing. Other WestFax plans start at $8.99 for 500 pages. 


  • Easy migrations
  • No long-term commitment
  • Interactive API documentation


  • Interface tends to be confusing
Top 7 Fax API Providers in 2024: Best for Developers

6. eFax Corporate

eFax lets you send and receive SSL-encrypted faxes through dedicated toll-free or local fax numbers. It also uses redundant fax and transport infrastructure to deliver a highly secure and compliant solution. It maintains audit logs for compliance that can view up to 20 different tracking and reporting metrics. 


  • Email to fax
  • eFax Corporate Mobile App
  • eFax Messenger


  • eFax Corporate offers scalable custom plans


  • 99.5% uptime and speedy fax deliveries
  • Scalable and secure
  • HITRUST CSF certified


  • Slow customer support
Top 7 Fax API Providers in 2024: Best for Developers

7. FaxPlus

FaxPlus lets you integrate all the features of its online faxing solution into any application and software. It uses REST API, so you can incorporate online faxing with any workflow and automate your existing systems. It also supports SSL.TLS encryption so you can keep communications secure.


  • Web and mobile apps
  • Fax number flexibility
  • Fax cover sheets
  • Email to fax


  • Offers a Premium faxing plan at $79.99 monthly, including API access


  • Free activation for all enterprise accounts
  • Works with Javascript, Node.JS, Ruby, and Python
  • Comprehensive API documentation


  • Expensive plan

Criteria for Selection

Here are several factors you should consider when evaluating a fax API provider:


Fax APIs offer different pricing models to meet your needs. If you fax less often, choose a pay-as-you-go plan. A monthly enterprise plan will give you the best value for your money if you’re a large enterprise with high-volume faxing requirements.


You can’t risk using a fax API provider with inadequate security features. Online fax demands the highest and most stringent security features, so don’t compromise, only look for the best. Look for 256-bit encryption, TLS security, and other similar security protocols. 


Depending on your industry, you want a fax API provider who meets compliance requirements like audit trails, robust security, and signed agreements (i.e., BAAs). Whether you need HIPAA, GDPR, or PCI DSS compliance, ensure your faxing solution can meet these requirements.

Integration capabilities

You don’t want to disrupt existing workflows just because you’re introducing a new fax solution. Only a fax API provider with seamless integration capabilities can achieve this. Make sure you choose the ones that can already integrate with your existing infrastructure. 

Customer support

While API documentation and talented developers are often enough, there may be moments when an issue arises, and you need a higher level of support. Check for live chat or phone channels that you can reach anytime for immediate assistance.


As your business grows, you’d want a provider that can accommodate your growing needs. Fax API providers must be able to support different devices and platforms. It must also be capable of supporting your growing number of faxing needs. 

Tips for Selecting the Right Fax API Provider

Aside from the criteria above, the following tips will help ensure you get the right fax API provider.

Check for any hidden charges

Ask the fax provider about any overage charge if you exceed your limit and any extra charges they might bill later. Read the Terms and Conditions carefully to know what you are agreeing to.

Research the company’s reputation

Read online reviews and check what people like and dislike about the company. Avail yourself of the free demos and sales consultations so you can ask the fax API provider directly about their services and customer support.

Choose a provider that meets your faxing needs

You know your needs best, so choose a fax provider that best suits you. If you’re a small business, look for low-priced options with a free trial. If you need to send mass faxes, look for a provider that supports bulk faxing

iFax: The Best Fax API Provider in 2024

With over five million delighted users and a 4.5-star average rating, iFax is a reliable Fax API provider offering comprehensive solutions and dependable support. As a cost-effective provider, it helps users focus on running their business instead of worrying about increasing faxing costs.

With iFax’s Fax API, you can:

  • Easily integrate faxing capabilities into existing applications.
  • Automate tasks while having the flexibility to customize your functionalities with JSON, Ruby, Python, Node.JS support, and more.
  • Meet high-volume faxing requirements with ease and efficiency.
  • Enjoy a secure and reliable network, encrypted transmissions, and other security features.

Get a free demo of our Fax API today and experience seamless faxing straight out of your existing business platform.

Kent Cañas

Kent is a content strategist currently specializing in HIPAA-compliant online fax. Her expertise in this field allows her to provide valuable insights to clients seeking a secure and efficient online fax solution.

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