G3N File

What are G3N files and how to open them

Are you having problems opening a G3N file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your G3N files.

What is a G3N file?

A .G3N file is a Zetafax Fax Image File (Normal) file.

Zetafax Fax Image File (Normal) files carry archived faxes in normal resolution made by the Zetafax fax server software. These are monochrome images, saved primarily to store or view faxes sent or received when the user or system chooses "normal" rather than "fine" resolution. The purpose of a G3N file is to provide a TIFF-based image suitable for archiving or viewing without taking up the extra storage or bandwidth that fine-resolution images require. Zetafax uses the G3N variant when documents are configured in standard (200 × 100 dpi) mode.

G3N files are created by the Zetafax server or client when faxes are saved, or when letterhead, background or cover-sheet images are stored in standard mode. They are not designed for editing text; they act as exact image captures. To view them, you typically use Zetafax Viewer, or any image viewer or fax software that supports TIFF files with Group-3 fax compression. Zetafax itself treats G3N files as native fax image formats.

Technically, G3N files are TIFF images using Group-3 fax compression with one-dimensional (Modified Huffman) encoding, 1 bit per pixel (black and white), and a single data strip per page. The scan-line width is set at 1728 pixels, and the resolution corresponds to approximately 204 × 98 or 200 × 100 dots per inch on most systems. Zetafax accepts only TIFF files that match these parameters, or else will convert incompatible ones automatically in newer versions.

How to open G3N files

We have identified one G3N opener that is compatible with this specific type of G3N file.

Programs that open Zetafax Fax Image File (Normal) files

Last updated: August 6, 2026

Various apps that use files with this extension

These apps are known to open certain types of G3N files. Remember, different programs may use G3N files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about G3N file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.