mFax is a mobile faxing service by Octagon Lab that lets you send and receive faxes from your iPhone or Android phone. Over 5 million users rely on it for quick, secure faxing without a fax machine.

mFax offers a pay-per-fax model for occasional senders, so you only pay when you send. Subscription plans are available for regular users. Business plans start at $20.99/mo and include a virtual fax number and HIPAA compliance.

Is mFax HIPAA compliant?

Yes. mFax Business plans include HIPAA compliance features — TLS encryption, a signed Business Associate Agreement (BAA), access controls, and audit logging. See our [HIPAA compliant fax guide](/blog/hipaa-compliant-fax/) for details on what to verify.

How do I send a fax with mFax?

Download the mFax app, upload or photograph your document, enter the recipient's fax number, and tap Send. The fax is delivered in seconds with a confirmation receipt. Full instructions in our [how to fax from iPhone guide](/blog/how-to-fax-from-iphone/).

How does mFax compare to eFax?

mFax offers a cleaner mobile experience and more transparent pricing than eFax, which is better suited to large enterprise deployments. See our [mFax vs. eFax comparison](/blog/mfax-vs-efax/) for a full breakdown.

mFax: Everything You Need to Know (2026 Guide)

mFax is a mobile faxing platform trusted by over 5 million users worldwide. Learn how mFax works, what it costs, how it compares to alternatives, and whether it is the right fax service for you or your business.

Frequently Asked Questions

What is mFax?: mFax is a mobile faxing service by Octagon Lab that lets you send and receive faxes from your iPhone or Android phone. Over 5 million users rely on it for quick, secure faxing without a fax machine.
Is mFax free?: mFax offers a pay-per-fax model for occasional senders, so you only pay when you send. Subscription plans are available for regular users. Business plans start at $20.99/mo and include a virtual fax number and HIPAA compliance.
Is mFax HIPAA compliant?: Yes. mFax Business plans include HIPAA compliance features — TLS encryption, a signed Business Associate Agreement (BAA), access controls, and audit logging. See our [HIPAA compliant fax guide](/blog/hipaa-compliant-fax/) for details on what to verify.
How do I send a fax with mFax?: Download the mFax app, upload or photograph your document, enter the recipient's fax number, and tap Send. The fax is delivered in seconds with a confirmation receipt. Full instructions in our [how to fax from iPhone guide](/blog/how-to-fax-from-iphone/).
How does mFax compare to eFax?: mFax offers a cleaner mobile experience and more transparent pricing than eFax, which is better suited to large enterprise deployments. See our [mFax vs. eFax comparison](/blog/mfax-vs-efax/) for a full breakdown.