LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > Fax from an all-in-one printer
Yes, if the model includes fax capability. A fax-capable all-in-one still needs a phone line plugged into its LINE port, because the USB or Wi-Fi connection to your computer only handles printing and scanning. A few models can send internet faxes through a built-in service instead, with no phone line at all.
| Your situation | What you need | How it works |
|---|---|---|
| Fax-capable printer + landline | Phone cord from wall jack to the printer's LINE port | Classic analog fax, same as a standalone machine |
| Fax-capable printer, no landline | Check for internet fax on the printer's panel | Printer emails the document to a fax service |
| Printer without fax hardware | An online fax service instead | Scan on the printer, send from your computer or phone |
Look for a LINE port on the back of the printer, a phone-style jack usually labeled LINE, next to another labeled EXT for an extension phone. If both jacks are there, the printer almost certainly has a fax modem inside. Also check the printer's control panel or touchscreen for a fax icon; manufacturers rarely include fax menus on models without the hardware. The product page or the specifications sheet on the box lists fax as a function alongside print, scan, and copy on capable models. One caution: some recent consumer models have dropped the fax modem to cut costs, so a printer that looks identical to last year's fax-capable version may not fax. The jacks on the back are the ground truth.
Plug a phone cord from the wall jack directly into the LINE port, not the EXT port. The EXT port is a pass-through for an answering machine or extension phone, and plugging the line in there means the printer never sees incoming calls. Use a direct run of cord with no splitters at first; you can add them back once it works. Then run the printer's built-in fax setup wizard, which usually sets your sender name, fax number, and the number of rings before answering. Send a test fax to a friend's machine or a fax test number before you trust it with anything important.
Not with the classic method. The Wi-Fi or USB connection carries print jobs and scans between the printer and your computer; it cannot carry the analog phone call a fax needs. If you have no landline, you have three real options. Some printers have internet fax built in: you type the recipient's number on the touchscreen and the printer routes the job through an online service over your network connection, sometimes with a subscription. Your phone line may actually be digital: many cable and fiber providers deliver voice over their internet connection, and those lines can carry faxes, though quality varies. Or skip the printer's fax function entirely and use an online fax service: scan the document on the all-in-one and send it from your computer or phone.
The top three setup failures are the wrong jack (line plugged into EXT instead of LINE), a DSL filter problem (an unfiltered DSL line injects noise that kills fax tones; a filter on the line usually fixes it), and VoIP lines that garble the handshake. Digital phone lines from cable providers are the most common source of intermittent failures: outgoing faxes mostly work while incoming ones flake out, or vice versa. Lowering the fax speed in the printer's settings is the classic fix for flaky digital lines, because slower tones survive distortion better. If the printer shares the line with voice calls, set the rings-to-answer higher than any voicemail so the printer does not steal voice calls, or lower so it beats the voicemail to fax calls, depending on which you want to win.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com