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Phaxio review

#2 of 26 in Fax APIseFax Software

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

9.2/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Phaxio is a cloud fax API for developers and businesses that need to send and receive faxes from software applications. Its REST API returns JSON responses and supports outbound faxing from files, URLs, or HTML content, while provisioned phone numbers support inbound faxing. Status retrieval, delivery tracking, callbacks, webhooks, and document retrieval help teams connect fax workflows to their own applications.

Pricing is pay-as-you-go, with regional per-page rates and optional monthly phone numbers. The phone-number plan is listed at $2 per month for US and Canada phone numbers. The published plans also include US and Canada faxing, international faxing, Caller Name, and volume pricing for US and Canada or international faxing at 50,000+ and 100,000+ pages. Free test API keys are available for staging, while production usage is paid.

Phaxio’s strongest fit is an application that needs operational control around fax delivery. Batching, collision avoidance, configurable retries, cancel timeouts, metadata tagging, and PhaxCode barcode routing cover workflows that go beyond basic send-only faxing. Phone-number provisioning and management, plus client libraries for multiple programming languages, support integration into varied development environments. Choose Phaxio when API coverage, inbound faxing, event callbacks, and routing matter. Teams looking for a standalone fax workspace or a free production tier should consider a different type of service.

Phaxio pros and cons

  • Where it wins
    • Sends fax content from files, URLs, or HTML
    • Supports inbound numbers, tracking, webhooks, retries, and batching
    • Provides REST, JSON responses, and client libraries for multiple languages
  • Where it doesn't
    • No free production plan
    • International and volume pricing varies by destination and usage
    • Requires development work rather than a standalone fax workspace

Phaxio fact sheet, pricing and score →

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