GP4 File Type

- The quick facts

What are GP4 files and how to open them

Are you having problems opening a GP4 file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a GP4 file?

GP4 files have multiple uses, and CCITT Fax Format is one of them.

CCITT Fax Format

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 computers 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

Important: Different programs may use files with the GP4 file extension for different purposes, so unless you are sure which format your GP4 file is, you may need to try a few different programs.

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

Last updated: February 24, 2022

All known file formats using extension .GP4

While CCITT Fax Format is a popular type of GP4-file, we know of 2 different uses of the .GP4 extension. Different software may use files with the same extension for different types of data.

Guitar Pro v4 Tablature

Guitar Pro 4 allows for the editing of guitar and bass tablature files and the creation of scores for stringed instruments, such as the bass and the guitar. The music files created and saved by the Guitar Pro 4 software are saved with the .gp4 file extension. Guitar Pro 3 used file extension gp3.

While the files contain scores used to create music, the files do not have any actual audio data in and of themselves.

GP4 opener for Windows

We have identified 2 GP4 openers that are compatible with this specific type of GP4 file.

Guitar ProGuitar ProVerified
TuxGuitarTuxGuitarVerified

Various apps that use files with this extension

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.

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
Guitar Pro Fretlight ReadyGuitar Pro Fretlight ReadyUser submitted
Guitar Tablature EditorGuitar Tablature EditorUser submitted