Convert KOA to CG4

KOA to CG4 converter that respects your privacy. No cloud uploads, no file size limits — just fast offline batch processing.

Online converters too slow for your KOA files? reaConverter works locally and handles unlimited batches. All processing runs locally on your PC, so your files stay private and secure.

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KOA to CG4
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How to Convert Multiple KOA Files to CG4?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting KOA files in under two minutes.

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Install reaConverter

2. Load your KOA files

Add KOA files to reaConverter. One file or a thousand, the process is the same. Everything runs locally on your machine.

You can drag-and-drop files, browse to a folder, or add entire directory trees including subfolders.

Load your KOA files into reaConverter

3. Select CG4 as output format

Select CG4 from the output format list and set your destination folder. You can also adjust quality and compression settings.

Select CG4 as output format

4. Start KOA to CG4 conversion

Click the Convert button to start. reaConverter will process all your files with the settings you selected.

Start Conversion

When finished, your new .cg4 files will be waiting in the destination folder.

KOA to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your KOA 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 KOA 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 20, 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 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
"After 200+ conversions on my budget laptop (i3-1115G4/4GB RAM/Win11), reaConverter outperforms heavyweight tools. Zero crashes, low CPU usage during batch processing, and no internet dependency - exactly what professionals need."
Walter Morgan
Walter Morgan
Satisfied Customer
"The step-by-step video makes conversion foolproof. I'd recommend this to my grandma - it's that well-explained!"
DeShawn M. Thompson
DeShawn M. Thompson
Happy User
"I'm really impressed with this software - it converts files between formats incredibly fast!"
Lin Zhang
Lin Zhang
Happy User

KOA to CG4 Conversion: FAQ

What are KOA files?

The KOA format is associated with Koala Paint or Koala Painter, a very basic drawing program used during the 1980s on the Koala Pad. The latter was an incipient form of graphics tablet which attached to some models of home computers that were popular at the time, including the Commodore 64 and Atari. The KOA format is currently considered archaic and rare.

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 KOA to CG4?

Yes! reaConverter instantly converts .koa 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 KOA to CG4 online?

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

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

The best way to change KOAs 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 KOA to CG4.

How can I automate KOA 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 KOA 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 koa to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert GIS filesConvert CAD formatsSet picture bit depthConvert vector imagesChange image color space

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