Convert RAS to CG4

RAS to CG4 conversion that keeps your files private. reaConverter runs offline on your computer with full batch processing support.

Online converters too slow for your RAS 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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RAS to CG4
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How to Convert Multiple RAS 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 RAS files

Add RAS 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 RAS 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 RAS 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.

RAS to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your RAS 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 RAS 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
"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
Satisfied Customer
"Your solution was buried deeper in search results than it should be. After struggling with unclear alternatives, I found your guides — finally, instructions that made sense for a first-time user like me. Excellent work!"
Richard E. Miller
Richard E. Miller
Satisfied Customer
"Converts files in seconds! Finally a tool that's both fast and simple to use."
Wei Chen
Wei Chen
Happy User

RAS to CG4 Conversion: FAQ

What are RAS files?

The RAS file extension represents the CALS Raster File Format, a standard developed by the U.S. Department of Defense for the interchange of monochrome raster graphics. It is primarily used for storing high-resolution, black-and-white images such as engineering drawings, technical manuals, and scanned documents. CALS RAS files are typically used in military, aerospace, and government applications due to their consistency and archival suitability. The format supports compression and is optimized for printing and long-term storage.

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 RAS to CG4?

Yes! reaConverter instantly converts .ras 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 RAS to CG4 online?

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

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

The best way to change RASs 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 RAS to CG4.

How can I automate RAS 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 RAS 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 ras to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert DICOM imagesResize pictureConvert Gerber imagesCrop picturesConvert vector images

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