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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →You can fax an existing PDF from a Windows PC or Mac using an online fax service—no fax machine, modem, or phone line is needed for that browser-based route. Choose a service that supports your destination and document, enter the recipient’s fax number, attach the PDF, and check the delivery report after sending.
What you need to fax a PDF from a computer
- The PDF file saved on your computer.
- Internet access and an account with an online fax provider.
- The recipient’s complete fax number, including the country and area codes the provider requires.
Fax.Plus documents sending a PDF through its online workflow and lists PDF among its supported file types. Other providers may accept different formats or impose different size and page limits, so check the service’s current requirements before uploading. Fax.Plus’s computer fax guide
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How to send the PDF through an online fax service
- Choose a provider and sign in. Confirm that it can send to the recipient’s country and supports your PDF’s size and page count.
- Open the provider’s Send Fax page. Enter the recipient’s full fax number in the format the service requests.
- Attach the PDF. Check that the right document uploaded and that any additional pages or attachments are in the intended order.
- Add a cover page if needed. Review its contents and make sure it does not expose information you do not want to send.
- Check the recipient and attachment, then send. Keep the provider’s status or delivery report. If the report is unclear or the recipient does not receive the fax, contact the provider or recipient to resolve it rather than assuming that clicking Send proves delivery.
These steps reflect the provider’s documented workflow, not an independent transmission test. Fax.Plus says its report can be accessed by email or in the account dashboard. Fax.Plus’s computer fax guide
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Other ways to fax from a computer
Email-to-fax
Some services let you send a fax by email after you enable the feature and link an email address to your account. Fax.Plus documents an address format that combines the destination number with @fax.plus; that syntax is specific to that provider, not a universal fax address. Its guide also describes using email body text as cover-page content. Check your provider’s setup and formatting rules before sending. Fax.Plus’s computer fax guide
#1 Best Overall
- DIAL-UP & FAX SUPPORT: Hardware-based USB 2.0 Fax modem adds data and fax functionality to your computer / laptop via USB without putting additional load on your CPU; For faxing, rural internet access, security systems, POS credit authorization
- VOICE AND CALLER ID SUPPORT: Make and receive phone calls through your desktop / laptop computer; This portable USB modem supports Caller ID functionality and is compatible with most dial-up ISP (Internet Service Provider) networks
- DATA/FAX MODE SUPPORT: Data: V.92, V.90, V.34, V.32bis, V.32, V.22bis, V.22, V.23, V.21 Bell 212A & Bell 103; Fax: V.17, V.29, V.27, V.21 Ch 2, EIA/TIA 578 Class 1 and T.31 Fax Class 1.0; DTMF support
- TECH SPECS: External 56K Modem; Data Fax; USB Type A; 1 x RJ11 Telephone Jack; 56 Kbps Down, 33.6 Kbps Up Data; 14.4 Kbps Fax V.92; V.44 Compression; Conexant CX93010-21Z; USB Powered; TAA Compliant
- COMPATIBILITY: Drivers available for Windows, Windows Server, macOS (10.9 to 12.x) and Linux (kernel 3.16 and up); Windows Drivers available for download
Print-to-fax or a desktop app
eFax describes a workflow in which a user selects its virtual printer from a document’s Print menu, then chooses the recipient and sends. Whether this option is available, and what installation it requires, depends on the service; check its current support instructions. eFax’s computer fax guide
A fax modem and phone line
A local modem is a hardware-dependent alternative. eFax describes a Windows setup using a built-in or external fax modem connected to a phone line and Windows Fax and Scan. Its guide characterizes modem faxing on Mac as limited to older macOS support. This is not required for the online browser method. eFax’s computer fax guide
Rank #2
- 56K data/fax modem with USB interface, compliant with V.90, and V.42/V.42bis/MNP5 protocols and V.17, V.29, and V.27ter Group 3 fax protocol.
- Support Auto-Dial, Tone and pulse dialing, Auto answer, Auto retrain.
- Support Windows 98SE/2000/ME/XP/Vista/Win 7.
- Support Caller ID and distinctive ring detect, Auto format/speed sensing, Data/Fax/Voice call discrimination, Single configuration profile stored in host, call forward/fallback.
- 2 RJ11 Ports, you can set your telephone, fax system. Up to 56K data download, 48K data upload, and 14.4K fax communication.Provide Quick Connect and Modem-on-Hold features.
Microsoft Office Internet Fax
Microsoft says Office Internet Fax relies on the Windows Fax Printer Driver or Fax Services being installed. The feature is therefore not a turnkey fax service available on every Windows computer; the required driver or service must be present. Microsoft’s instructions for the Windows Fax driver or service
Check these details before choosing a provider
Features, limits, and terms vary, and the available provider guides do not establish a neutral, like-for-like ranking or current price comparison. Compare the details that affect your particular send:
Rank #3
- Performance: Support automatic dialing, tone and pulse dialing, automatic answering, automatic fax sending and receiving. Support caller ID, automatic format/speed sensing, data/fax/voice call, single profile stored on the host, call forward/backward.
- Plug and Play: The USB 2.0 fax modem dial-up adapter is suitable for WIN 98 / 2000 / ME / XP / Vista / CE5.0 / 10 / 8.1 / 8 / 7. No need for any external driver.
- Data/Fax Mode: Comply with V.92, V.90 and V.42, V.42bis / MNP5 protocol. Meets V.17, V.29, and V.27ter Group 3 fax protocols. For GRIS fax cats can dial the Internet, send and receive faxes, but do not support voice calls.
- Tech Specs: Up to 56k data download, 48k data upload, and 14.4k fax communication. The 56k data/fax modem uses USB 2.0 Type A with a full speed of 56kb/s.
- Compatibility: Standard and expanded AT command set compatibility. Provides fast connection and maintenance function on the modem.
- Whether the provider supports the destination country.
- Outgoing page allowances, any overage charges, and batch or multiple-recipient options.
- Accepted file types and file-size limits.
- How delivery status is reported and how to retrieve the report.
- Availability of email-to-fax or a desktop application.
- Whether you also need an inbound fax number; receiving faxes is a separate service need and may require an active plan and a new or ported number.
- Retention, deletion, and security terms, especially for sensitive documents.
Do not assume a service is free, secure for a particular regulated use, or guaranteed to deliver based on a general how-to page. For health, legal, or financial documents, check the provider’s current contractual terms and the rules that apply to your situation.
Quick Recap
Best Value
- Dual Interface - USB-C Type-C Type C - USB 2.0
- Windows 11 10 Compatible - Fully Compatible with the latest Windows OS - Driverless Installation for Windows 11 10
- Tested on DELL 3847 Windows 11 - Send/Receive Fax successfully - Dial-Up connection connected to Netzero at 46.6 kbps
- USB-C Type C USB 2.0 Plug and Play - Fast & Easy hardware and driver installation - USB Powered, No power adapter needed
- Dual RJ-11 Phone Jack for Expansion - Dual Jack for connecting an additional Telephone or Answering Machine
Rank #4
- Dual port built in buzzer, compatible with Windows 10, latest Windows OS installation for Windows 10, 8.1, 8, 7, 32-bit, 64-bit
- Tested on Dell inspiron 3847 Windows 10 home 64-bit -send/receive fax successfully -dial up connection connected to NetZero at 46.6 KBPS
- USB 2.0 plug and play -fast & easy hardware and driver installation - USB powered, no power adapter needed
- Dual RJ-11 phone jack for expansion - dual jack for connecting an additional telephone or answering machine
- Fax compatibility ITU-T- send & receive rates up to 14.4k BPS, mOh - receive phone call during active internet connection
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