Convert GUN to CG4

Convert GUN to CG4 without quality loss. reaConverter gives you full control over resolution, compression, and output settings.

reaConverter transforms GUN files to CG4 quickly and reliably. Drag in folders, set your options, click Convert, done. No cloud accounts, no file uploads, no complicated setup. Just install and start converting.

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GUN to CG4
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How to Convert Multiple GUN 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 GUN files

Load your GUN files into reaConverter. You can add individual files or point to folders, and the software will queue everything automatically.

Select GUNs from a folder or drag-and-drop them directly into the reaConverter window.

Load your GUN files into reaConverter

3. Select CG4 as output format

Choose CG4 for output and set your save location. reaConverter lets you customize quality and apply edits before conversion.

Select CG4 as output format

4. Start GUN to CG4 conversion

Press the Convert button and reaConverter takes care of the rest. Processing time depends on file size and volume.

Start Conversion

After processing, find all your new .cg4 files in the output location. The log shows details for each conversion.

GUN to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your GUN 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 GUN 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 16, 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
"An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!"
Logan B.
Logan B.
Satisfied Customer
"I use the online converter — it’s quick and hassle-free!"
Jian Wong
Jian Wong
Happy Online User
"Working in a print studio means constantly juggling obscure file formats. I used to waste hours Googling converters or installing random software — until reaConverter became my Swiss Army knife. Install it once, and you're set forever. No internet? No problem!"
Helen Evans
Helen Evans
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"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
J. Mitchell
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"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

GUN to CG4 Conversion: FAQ

What are GUN files?

GUN is an image file format associated with Gunpaint, a currently obsolete drawing software program initially designed for Commodore 64 computers. This brand was highly popular in the 1980s and 1990s, being one of the first types of personal computers to become widely used by home users. The GUN format might also have been compatible with other models of 8-bit Commodore computers, such as the Commodore 16, 128 or SX-64. Images created with Gunpaint are most likely difficult to open using regular image viewers, so converting them is the best option.

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 GUN to CG4?

Yes! reaConverter instantly converts .gun 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 GUN to CG4 online?

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

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

The best way to change GUNs 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 GUN to CG4.

How can I automate GUN 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 GUN 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 gun to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert DICOM filesResize pictureCopy metadata (EXIF, IPTC)Change format settingsChange DPI

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