Can I fax from a scanner without a phone line?

Yes. Scan your document to a PDF file, then upload it to an online fax service like [mFax.to](https://mfax.to). No phone line, no fax modem, and no dedicated fax machine required — just a scanner and an internet connection.

What DPI should I use when scanning for fax?

200–300 DPI is the sweet spot. Fine fax resolution is 204×196 DPI, so scanning at 200–300 DPI captures all the detail a fax needs. Higher DPI (600+) only creates a larger file without improving the received fax quality. See our full [fax resolution settings guide](/blog/fax-resolution-settings/).

What file format should I save a scan for faxing?

PDF is the best choice. It supports multi-page documents in a single file, preserves formatting, and is accepted by every online fax service. Avoid JPG — compression artifacts reduce text clarity.

Do I need a special scanner to send a fax?

No. Any flatbed, sheet-fed, or all-in-one scanner works for the scan-then- send-online method. Only the direct fax method (via phone line) requires a multifunction printer with a built-in fax modem and an RJ-11 phone port.

Why is my fax coming out blurry after scanning?

The two most common causes are scanning in color or grayscale (switch to black-and-white monochrome) and scanning at too low a DPI. A dirty scanner glass also causes streaks and soft spots. See our [blurry fax troubleshooting guide](/blog/why-is-my-fax-blurry/) for a full checklist.

How to Fax From Scanner: Step-by-Step Guide (2026)

You can fax from a scanner two ways: directly via a built-in fax modem on an all-in-one printer, or by scanning to PDF and uploading to an online fax service — no phone line required. This guide covers both methods step by step for HP, Brother, Canon, and Epson.

Frequently Asked Questions

Can I fax from a scanner without a phone line?: Yes. Scan your document to a PDF file, then upload it to an online fax service like [mFax.to](https://mfax.to). No phone line, no fax modem, and no dedicated fax machine required — just a scanner and an internet connection.
What DPI should I use when scanning for fax?: 200–300 DPI is the sweet spot. Fine fax resolution is 204×196 DPI, so scanning at 200–300 DPI captures all the detail a fax needs. Higher DPI (600+) only creates a larger file without improving the received fax quality. See our full [fax resolution settings guide](/blog/fax-resolution-settings/).
What file format should I save a scan for faxing?: PDF is the best choice. It supports multi-page documents in a single file, preserves formatting, and is accepted by every online fax service. Avoid JPG — compression artifacts reduce text clarity.
Do I need a special scanner to send a fax?: No. Any flatbed, sheet-fed, or all-in-one scanner works for the scan-then- send-online method. Only the direct fax method (via phone line) requires a multifunction printer with a built-in fax modem and an RJ-11 phone port.
Why is my fax coming out blurry after scanning?: The two most common causes are scanning in color or grayscale (switch to black-and-white monochrome) and scanning at too low a DPI. A dirty scanner glass also causes streaks and soft spots. See our [blurry fax troubleshooting guide](/blog/why-is-my-fax-blurry/) for a full checklist.