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Openfax Cloud Fax API review

#7 of 26 in Fax APIsOnline Fax Services

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

8.7/10Editor score
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Openfax Cloud Fax API8.7 Visit Openfax

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Openfax Cloud Fax API provides programmatic fax transmission for developers and organizations that need outbound sending, inbound fax numbers, delivery tracking, and automated result handling. Its scope covers single outbound fax submissions, multi-recipient broadcasts, DOCX-based mail-merge broadcasts, inbound fax number configuration, and reporting by transaction ID or date range. Teams managing recurring communications, document-driven fax workflows, or inbound document routing will find the feature set closely aligned with those needs. It is less suited to organizations seeking a general-purpose communications platform beyond fax transmission.

Pricing is usage-based rather than organized around recurring API plans. The Standard fax broadcast plan is listed at $0.03 per page for US-48 and Canada, while Mail merge services broadcast is listed at $0.04 per page for those regions. The published documentation also describes free developer trial credits after registration. Paid usage is therefore most relevant to teams that can estimate page volume and distinguish between standard broadcasts and DOCX mail-merge services. The company, Opfx, Inc., dates to 1999, adding an established operating history to the product's positioning.

Integration and workflow coverage are the main reasons to consider Openfax. HTTP endpoints support fax submission, balance queries, report retrieval, and delivery notifications, while webhook postbacks can return fax results. Received faxes can be delivered through email, AWS S3, or webhook postbacks, and outbound reporting supports transaction ID or date-range queries. Account-based authentication uses an account number and API key. Choose Openfax when broadcast delivery, mail merge, inbound numbers, and trackable API events are central requirements; choose an alternative when you need recurring subscription tiers or a broader communications suite.

Openfax Cloud Fax API pros and cons

  • Where it wins
    • Broadcasts faxes to multiple recipients from one submission
    • Creates mail-merge fax broadcasts from DOCX templates
    • Delivers results through reports, webhooks, email, or AWS S3
  • Where it doesn't
    • No recurring API plans are listed
    • Pricing is specified for US-48 and Canada
    • Account number and API key authentication may require developer setup

Openfax Cloud Fax API fact sheet, pricing and score →

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