A2Fax
Send free faxes online. No ads, add your logo to cover pages.
Open the official app on www.a2fax.com
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Run the open-source version on your own infrastructure.
What is A2Fax?
A2Fax is an open-source fax server software designed to enable inbound and outbound faxing through various communication protocols. It supports scenarios such as web-to-fax, fax-to-web, and email-to-fax integration, making it suitable for businesses requiring automated fax services. The tool addresses the need for reliable fax communication in environments where traditional fax machines are impractical, offering scalable solutions for organizations handling high volumes of fax transactions. Developers and IT administrators use A2Fax to streamline fax operations, reduce manual intervention, and ensure compatibility with modern digital workflows. By leveraging protocols like G.711, T.38, and PSTN, A2Fax bridges legacy fax systems with contemporary internet-based infrastructure, solving challenges related to fax interoperability and data security.
How it works
A2Fax is an open-source project hosted on GitHub under the ictinnovations/ictfax repository. It functions as a fax server software that enables organizations to send and receive faxes via web interfaces, email, or traditional fax machines connected to the internet. The primary purpose of A2Fax is to provide a flexible, scalable solution for fax communication in environments where traditional fax infrastructure is limited. It supports integration with third-party applications through REST APIs, allowing automation of business processes that rely on fax data exchange. A2Fax supports multiple fax protocols including G.711 for voice-grade fax transmission, T.38 for IP-based faxing, and PSTN (Public Switched Telephone Network) for traditional phone-line faxing. It also enables web-to-fax and fax-to-web conversions, allowing users to send and receive faxes through browser-based interfaces.
How to use it
- 1Clone the ictinnovations/ictfax repository from GitHub and install dependencies. 2. Configure the server with required protocols (G.711, T.38, or PSTN) and network settings. 3. Set up REST API endpoints for integration with external applications. 4. Use the web interface or API to send/receive faxes, or connect fax machines via ATA devices to the server. Practical tips: Ensure proper firewall settings for T.38/IP faxing, test PSTN connectivity with a phone line, and validate email integration with SMTP servers for fax-to-email workflows.
What it can do
- Utility
Use cases
Assumptions and limitations
Assumptions
- source: https://github.com/a2fax
- license: Open source
- privacy: Opens an external demo
Limitations
- Requires technical expertise to configure protocols like T.38 or PSTN.
- Limited built-in user interface for non-technical administrators.
- Dependent on stable internet connectivity for IP-based faxing.
- No native support for modern fax encryption standards like TLS.
- Scalability may require additional infrastructure for high-volume use.
Understanding the result
Send free faxes online. No ads, add your logo to cover pages.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by a2fax (MIT).
- Built with
- a2fax (https://github.com/a2fax)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Text
- Output
- Output
Built with https://github.com/a2fax. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- a2fax
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- /a2fax — GitHub Repository
Upstream project · GitHub
Frequently asked
How does A2Fax handle fax transmission over the internet?
A2Fax uses T.38 protocol for IP-based faxing, which allows fax data to travel over VoIP networks without converting to traditional phone lines. For PSTN compatibility, it routes fax calls through standard telephone lines while maintaining protocol flexibility. G.711 is used for voice-grade fax transmission over IP networks, ensuring compatibility with VoIP systems.
Can A2Fax integrate with email systems?
Yes, A2Fax supports email-to-fax and fax-to-email workflows via SMTP integration. Incoming faxes can be automatically converted to email attachments, and outgoing emails can be sent as faxes through configured SMTP servers. This enables seamless communication between fax services and email platforms like Microsoft Exchange or Gmail.
How do I send a fax using the web interface?
Log in to the A2Fax web dashboard, navigate to the 'Send Fax' section, upload the document, enter recipient details, and select the fax protocol (G.711, T.38, or PSTN). Choose a phone line for PSTN connections, then click 'Send'. The system will process the fax through the configured gateway or API endpoint.
How does A2Fax compare to commercial fax services like eFax or MyFax?
A2Fax differs from commercial services by offering open-source customization and on-premise deployment, whereas services like eFax operate as cloud-based SaaS solutions. A2Fax provides deeper integration with legacy systems via PSTN and T.38 protocols, while commercial services often prioritize user-friendly interfaces and automatic number recognition. Both solutions handle fax-to-email, but A2Fax requires technical setup for advanced features.
What should I do if my fax fails to send?
Check the error logs for protocol mismatches (e.g., T.38 requires compatible VoIP providers). Verify that the recipient's fax number is correctly formatted. For PSTN issues, test the phone line with a traditional fax machine. Ensure the server has sufficient bandwidth for IP faxing, and confirm that the firewall allows traffic on required ports (e.g., TCP 5060 for SIP).