Developer Fax API

Fax API | Fax From Any Development Environment


InterFAX API gives developers the tools to create an integrated, secure cloud fax platform that enhances your IT and business infrastructure. Integrate for any industry with InterFAX’s API web fax – HIPAA Compliant, PHIPA & PIPEDA Compliant, PCI DSS, SSL Encryption, EU Data Protection, and more.

Sign up now for our free developer program to receive immediate access to the InterFAX Fax API and benefit from these features:

  • No hardware installations
  • No software setup
  • No phone lines to order

InterFAX accepts files in all popular Office formats, including PDF and HTML, and sends them to a fax number you specify. The API web fax offers basic fax send/receive, and advanced features such as multiple destinations, deferred transmission, document resolution, among others.

Integrate secure faxing for any industry!

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InterFAX Development Environment

  • REST API Faxing

    Send and receive faxes from REST using the InterFAX API.

    REST API Fax »

  • SOAP API Faxing

    Send and receive faxes from SOAP using the InterFAX API.

    SOAP API Fax »

  • PHP Fax

    Send and receive faxes from PHP using InterFAX.

    PHP Fax »

  • Python Fax

    Send and receive faxes from Python using InterFAX.

    Python Fax »

  • Ruby Fax

    Send and receive faxes from Ruby using InterFAX.

    Ruby Fax »

  • NodeJS

    FaxSend and receive faxes from NodeJS using InterFAX.

    NodeJS Fax »

  • SMTP Fax

    Send faxes through the InterFAX SMTP interface.

    SMTP Fax »

  • Java Fax

    Send and receive faxes from Java using InterFAX.

    Java Fax »

  • .Net Fax

    Send and receive faxes from .Net using InterFAX.

    .Net Fax »

What You Get

Free Registration

It costs nothing to join our developer program.


Free Support

Our support team ensures you have everything you need to get your application up and running.

Free Faxing

Send as many test faxes as you need to one designated fax number.


Access to Developer API

Your choice of REST API, SOAP API, or SMTP interface.

Features and Benefits of InterFAX

No Installations

No need to worry about fax software, servers, or phone lines. Be up and running in minutes.


Global Reach

Our fax servers are distributed over four continents. Send faxes wherever you are.


Unlimited Scalability

Whether you need to send ten faxes or ten thousand, our servers get the job done.


Full Control

Web-based administration screens allow you to monitor activity and control settings.

Encrypted Fax

Enhanced data security with SSL access and encryption for inbound/outbound fax messages.



Complies with the most stringent industry regulations, including the US-based Health Insurance Portability and Accountability Act (HIPAA).


Outbound PCI DSS Fax

Complies with this mandatory standard, ensuring the highest level of security for faxing credit card data.


EU Data Protection

Complies with the EU Data Protection Directive, ensuring that all faxes are handled within the EU.

Sample Uses

  • Automated Invoicing

    Enhance accounting practices by automating fax invoices and order confirmations directly from order processing systems.

  • Online Restaurant Orders

    Automatically fax orders from websites to restaurants for quick fulfillment and enhanced customer satisfaction.

  • Itineraries

    Fax travellers’ itineraries and related information directly from travel management systems.

  • Workflow

    Enable remote workers by faxing work orders to staff outside the office from existing workflow management systems.

Find out how it all fits together