How many pages can I fax at once?

With a physical fax machine, the ADF (Automatic Document Feeder) typically holds 20–50 pages. With an online service like mFax, you can send files up to 20MB — which covers hundreds of standard pages — in a single transmission.

Should I send multiple pages as separate faxes or one file?

Always combine them into a single PDF and send as one fax. Sending 10 separate 1-page faxes clutters the recipient's machine, increases the chance of pages getting mixed up with other incoming faxes, and means 10 separate dial attempts.

How long does a multi-page fax take to send?

Traditional fax transmission runs at roughly 1 page per minute. A 20-page document takes approximately 20 minutes over a standard phone line. Online fax services typically transmit faster — often 5–10 pages per minute.

What if my PDF is too large to fax?

Compress it first. Use a free tool like mFax's [Optimize PDF tool](https://mfax.to/optimize-pdf/) to reduce file size before sending. Most online fax services accept files up to 10–20MB, which is more than enough for text-heavy documents.

How do I combine multiple documents into one fax?

Merge them into a single PDF before sending. On iPhone, use the Notes app scanner or the Files app. On Mac, use Preview. On Windows, use the Print to PDF feature. Online, use a free tool like mFax's [Merge PDF tool](https://mfax.to/merge-pdf/).

How to Fax Multiple Pages at Once (No Jams) - 2026 Guide

Trying to fax a multi-page contract or medical form? Here is the right way to send multiple pages in one fax — from your phone, computer, or fax machine — without jams, missing pages, or failed transmissions.

Frequently Asked Questions

How many pages can I fax at once?: With a physical fax machine, the ADF (Automatic Document Feeder) typically holds 20–50 pages. With an online service like mFax, you can send files up to 20MB — which covers hundreds of standard pages — in a single transmission.
Should I send multiple pages as separate faxes or one file?: Always combine them into a single PDF and send as one fax. Sending 10 separate 1-page faxes clutters the recipient's machine, increases the chance of pages getting mixed up with other incoming faxes, and means 10 separate dial attempts.
How long does a multi-page fax take to send?: Traditional fax transmission runs at roughly 1 page per minute. A 20-page document takes approximately 20 minutes over a standard phone line. Online fax services typically transmit faster — often 5–10 pages per minute.
What if my PDF is too large to fax?: Compress it first. Use a free tool like mFax's [Optimize PDF tool](https://mfax.to/optimize-pdf/) to reduce file size before sending. Most online fax services accept files up to 10–20MB, which is more than enough for text-heavy documents.
How do I combine multiple documents into one fax?: Merge them into a single PDF before sending. On iPhone, use the Notes app scanner or the Files app. On Mac, use Preview. On Windows, use the Print to PDF feature. Online, use a free tool like mFax's [Merge PDF tool](https://mfax.to/merge-pdf/).