Convert ST4 to CG4

Stop converting ST4 files one by one. reaConverter processes entire folders to CG4 automatically — just drag, drop, and click Convert.

Looking to change ST4 files to CG4 format? reaConverter makes it simple — add your files, select output format, and convert entire folders in one click. Runs entirely on your hardware for maximum speed — no waiting for uploads or server queues.

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How to Convert Multiple ST4 Files to CG4?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting ST4 files in under two minutes.

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Install reaConverter

2. Load your ST4 files

Start reaConverter and add your .st4 files. The software processes everything locally, so your files never leave your computer.

Use drag-and-drop, folder browser, or right-click conversion from Explorer.

Load your ST4 files into reaConverter

3. Select CG4 as output format

Select CG4 from 700+ supported output formats. Choose your destination folder and adjust settings to match your needs.

Select CG4 as output format

4. Start ST4 to CG4 conversion

Click Convert to start the batch. reaConverter processes files quickly and shows you the status of each one.

Start Conversion

Once done, reaConverter shows a summary. Click 'Show converted files' to jump straight to your CG4 output.

ST4 to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your ST4 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 ST4 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.

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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
"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

ST4 to CG4 Conversion: FAQ

What are ST4 files?

An ST4 file represents a RAW image taken with an SBIG CCD camera. SBIG is a producer of astronomical instruments and ST4s most likely contain images related to some type of scientific or industrial application. They are considered rare and are probably difficult to open using regular image viewers.

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 ST4 to CG4?

Yes! reaConverter instantly converts .st4 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 ST4 to CG4 online?

If you only need to convert a few ST4 files to CG4 format, feel free to try our free online free online ST4 to CG4 converter — perfect for small batches with no installation needed!

How can I turn ST4 files into CG4 on my computer?

The best way to change ST4s 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 ST4 to CG4.

How can I automate ST4 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 ST4 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 st4 to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert GIS filesConvert DICOM imagesResize picturesConvert vector imagesConvert picture color space

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