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Openfax Cloud Fax API
What Openfax Cloud Fax API is
Openfax Cloud Fax API is a paid fax service for developers, available through an API and web interface. It provides access to global facsimile services for single faxes, broadcast campaigns, mail-merge broadcasts, inbound fax numbers, and fax reception. Received faxes can be sent to email, AWS S3 storage, or a webhook postback. Broadcasts may run immediately or at a scheduled date and time. Standard broadcasts remove duplicate numbers, while mail merge uses list data to personalize each fax. Broadcast jobs provide an email summary with success and failure CSV attachments. Single-fax delivery makes up to three redial attempts, waiting four minutes between attempts. The API requires an account, account number, and API key from the portal. Base64-encoded PDF input is limited to 50MB. Openfax lists paid broadcast plans, a free trial, inbound and outbound faxing, delivery tracking, webhook events, and several support channels.
Who it suits
It suits developers needing fax sending, receiving, broadcasts, or inbound numbers through an API or web service. Teams can also use scheduling, delivery integrations, tracking, and opt-out handling.
What it does well
- Supports single, broadcast, and mail-merge faxes
- Delivers received faxes by email, S3, or webhook
- Scheduled broadcasts and campaign reporting
- Free trial and developer trial credits available
- Inbound and outbound faxing supported
What to know first
- No free plan
- PDF input limited to 50MB
- Excel fax lists cannot use multiple worksheets
- Requires an account, account number, and API key
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Standard fax broadcast | Per-page pricing is subject to 60-second transmission times; longer transmissions may be billed per minute at the same r · US-48 and Canada pricing is listed at $0.03 per page | $0.03 a month |
| Mail merge services broadcast | Per-page pricing is subject to 60-second transmission times; longer transmissions may be billed per minute at the same r · US-48 and Canada pricing is listed at $0.04 per page | $0.04 a month |
| Fax broadcasting | per page; international destinations may use per-minute rates · US, Canada and worldwide destinations · no monthly fees | $3, paid once |
As openfax.com lists them, read 20 Sept 2026. The maker's own page has the final word.
Verdict
Openfax Cloud Fax API covers both programmatic fax operations and web broadcasts, with delivery integrations and reporting. Review the listed per-page or per-use charges and the account requirements before choosing it.
Facts from Openfax Cloud Fax API's own pages
- Account requirements
- Using the API requires an account, account number and API key obtained from the portal. · apidocs.openfax.com, 30 Sept 2026
- API purpose
- The Openfax Cloud Fax API provides developers access to global facsimile services. · apidocs.openfax.com, 30 Sept 2026
- Broadcast modes
- Standard broadcasts remove duplicate fax numbers, while mail merge personalizes each fax from list data. · openfax.com, 30 Sept 2026
- Data handling
- Openfax states that it does not share customer data except when required by law. · openfax.com, 30 Sept 2026
- Delivery integrations
- Received faxes can be delivered by email, AWS S3 cloud storage or webhook postback. · apidocs.openfax.com, 30 Sept 2026
- Developer credits
- Openfax offers free developer trial credits after registration when contacted. · apidocs.openfax.com, 30 Sept 2026
- Fax operations
- The API supports single faxes, fax broadcasts, mail-merge broadcasts, inbound fax numbers and fax reception. · apidocs.openfax.com, 30 Sept 2026
- Founded
- 1999 · openfax.com, 28 Sept 2026
- Free plan
- No · openfax.com, 20 Sept 2026
- Free test fax
- Free proof-copy test faxing is available for broadcast fax orders. · openfax.com, 30 Sept 2026
- Opt-out compliance
- The optional Fax Removal Service supplies a dedicated toll-free number for mass-fax opt-out requests. · openfax.com, 30 Sept 2026
- PDF limit
- The API limits the Base64-encoded PDF input to 50MB. · apidocs.openfax.com, 30 Sept 2026
- Reporting
- Broadcast jobs provide an email summary and JobID_Success.csv and JobID_Failed.csv attachments. · openfax.com, 30 Sept 2026
- Retries
- Single-fax delivery uses up to three redial attempts with a four-minute wait between attempts. · apidocs.openfax.com, 30 Sept 2026
- Scheduling
- Web fax broadcasts can be sent immediately or scheduled for a chosen date and time. · openfax.com, 30 Sept 2026
- Spreadsheet limit
- Openfax does not support multiple worksheets in Excel fax-list files. · openfax.com, 30 Sept 2026
- Support
- API support is offered by phone, chat, email, Slack invite and Skype invite. · apidocs.openfax.com, 30 Sept 2026
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