GP4 File - opening and understanding

Did your computer fail to open a GP4 file? We explain what they are used for and recommend software that we know can open or otherwise handle your .GP4 files.

What is a GP4 file?

Files that contain the .gp4 file extension are used by a variety of fax software applications. The .gp4 file extension is used to save generic fax image files.

Prior to digital fax software products, users had to have a fax device to send and receive fax messages. Once the Internet evolved, software developers began creating digital fax products, allowing users to send and receive faxes using their computer and an Internet connection.

GP4 files are saved in the CCITT file format. This standardized Group 4 format stores 1-bit or bi-level images using lossless file compression. The GP4 file format is able to compress the fax files into smaller file sizes than older file format versions without losing image quality.

How to open GP4 files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension GP4 for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different GP4 openers which you will find listed below.

Suggest another file format using extension GP4

While we know of one file format using the .GP4 file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .GP4 file.

Various viewers for this file format

These apps are known to open certain types of GP4 files. Remember, different programs may use GP4 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Guitar ProGuitar ProUser submitted
TuxGuitarTuxGuitarUser submitted
Altium DesignerAltium DesignerUser submitted
MaxView ApplicationMaxView ApplicationUser submitted
Go PlayAlongGo PlayAlongUser submitted
Altium Designer SummerAltium Designer SummerUser submitted
Altium Designer Summer ViewerAltium Designer Summer ViewerUser submitted
Altium Designer WinterAltium Designer WinterUser submitted
Guitar Pro LiteGuitar Pro LiteUser submitted
XnViewXnViewUser submitted
We have not verified any software that we know for certain will work with GP4-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with GP4-files. If you know one, please use the 'Suggest a program' link below and tell us about it!