Convert GP4 to CG4

Stop converting GP4 files one by one. reaConverter processes entire folders to CG4 automatically — just drag, drop, and click Convert.

GP4 to CG4 conversion is faster with the right tool. reaConverter handles everything from a few files to thousands in one batch. Processes files consistently every time, with full control over quality and output settings.

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How to Convert Multiple GP4 Files to CG4?

1. Download and Install reaConverter

reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately.

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Install reaConverter

2. Load your GP4 files

Launch reaConverter and drop in your GP4 files. The software queues everything for batch processing with consistent settings.

Add files by dragging them in, browsing folders, or using the right-click menu from Windows Explorer.

Load your GP4 files into reaConverter

3. Select CG4 as output format

Pick CG4 as output format and choose the destination folder where you want to save new .cg4 files.

Select CG4 as output format

4. Start GP4 to CG4 conversion

Then simply press the Convert button and your conversion will begin in no time!

Start Conversion

Once the conversion is complete, you can find your CG4 files in the destination folder you selected.

GP4 to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your GP4 files into CG4 in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting GP4 files for use in a workflow? reaConverter offers many ways to process files, so you can customize them according to your requirements.

Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on January 25, 2026
"reaConverter saved our team hundreds of hours by digitizing decades of CG4 archives in weeks—not months. Its resolution scaling preserved every detail, even in files older than some team members!"
Anna K.
Anna K.
Satisfied Customer
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
J. Mitchell
Satisfied Customer
"reaConverter is pure gold! Rock-solid performance with zero crashes. No internet needed—perfect for travel or low-connectivity work. The ultimate offline alternative to sketchy web converters. Plus, the desktop version keeps sensitive files secure since nothing ever gets uploaded to the cloud."
Malik T. Martin
Malik T. Martin
Satisfied Customer
"I was skeptical at first, but reaConverter exceeded my expectations. The interface is intuitive, and the advanced settings let me tweak outputs perfectly. Plus, the customer support is fantastic!"
Sarah Lane
Sarah Lane
Satisfied Customer
"An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness."
Elena Anderson
Elena Anderson
Happy User
"Enable shell integration for lightning-fast file conversions directly from Windows Explorer."
R. Lewis
R. Lewis
Happy User

GP4 to CG4 Conversion: FAQ

What are GP4 files?

GP4 is an image extension included in the CALS group of formats. CALS (Continuous Acquisition and Life-cycle Support) represents an initiative undertaken by the Department of Defence in the United States in the 1980s, with the aim of creating a standard for storing and linking military data. Similar formats include CG4, CAL and CALS. Most formats that are part of the CALS group are currently considered rare and obsolete.

What are CG4 files?

CG4 is a raster format associated with CALS (Continuous Acquisition and Life-Cycle Support) — a program initiated by the US Department of Defense to capture and link military data. CG4 is compatible with a very limited number of digital graphics programs. Files with this extension contain a bitmap that often uses the CCITT4 compression, which is an old fax machine standard used for black-and-white images.

Can reaConverter convert GP4 to CG4?

Yes! reaConverter instantly converts .gp4 to .cg4 with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert GP4 to CG4 online?

If you only need to convert a few GP4 files to CG4 format, feel free to try our free online free online GP4 to CG4 converter — perfect for small batches with no installation needed!

How can I turn GP4 files into CG4 on my computer?

The best way to change GP4s to CG4s on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from GP4 to CG4.

How can I automate GP4 to CG4 files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert GP4 files to CG4 using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line gp4 to cg4 converter for batch processing.

What else can I do with reaConverter?

Copy metadata (EXIF, IPTC)Convert GIS filesChange format settingsChange DPIConvert vector files

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