VSI → CG4 · Windows

Convert VSI to CG4

VSI to CG4 for figures, slides and archives. Everything runs on your own machine, with no upload and no size ceiling.

Got a folder full of VSI files? reaConverter batch converts them to CG4 in minutes, not hours. Local processing means instant results, even with thousands of files. Imaging facilities use it to clear a whole folder of acquisitions in one pass.

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VSI to CG4
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.vsi.CG4
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Converting files since 2001

Runs offline — nothing uploaded

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How to Convert Multiple .vsi 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 VSI files

Add your VSI acquisitions to reaConverter. Point it at the folder your microscope writes to and load the whole run at once.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your VSI files into reaConverter

3. Select CG4 as output format

Pick CG4 as the output format. TIFF is the usual choice for anything heading into analysis or a journal submission, while JPG and PNG suit slides and the web.

Select CG4 as output format

4. Start VSI to CG4 conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your CG4 files are ready in the destination folder you chose earlier.

Step by step

How It Works

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

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Deep Customization

Do more with your files

Converting VSI 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

What people say after the first batch

Average User Rating:4.8
Last updated on September 02, 2026
I needed to convert my pathology slides (VSI format) to standard images for a research paper. reaConverter handled this smoothly - it's much faster than the default Olympus software and maintains decent image quality. The batch processing saved me hours of work.
Dr. Emily Zhang
Dr. Emily Zhang
Clinical Pathologist
We deployed reaConverter across our department to standardize file formats for our archives. The command-line support and automation features integrated perfectly into our systems. Stellar performance and zero crashes—it just works.
David R.
David R.
IT Solutions Architect
So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!
Kenneth D. Carter
Kenneth D. Carter
Satisfied Customer
I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!
Mark T.
Mark T.
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

FAQ

VSI to CG4 Conversion

What are VSI files?

VSI (Virtual Slide Image) is a proprietary whole-slide imaging format developed by Olympus for digital pathology and microscopy. It stores high-resolution scanned slides with multi-layer, multi-resolution data for medical and research applications.

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 VSI to CG4?

Yes! reaConverter instantly converts .vsi 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.

Why choose offline conversion with reaConverter?

reaConverter is a software program that is used for offline files conversion. Your proprietary documents never leave your computer – essential for architects, engineers, healthcare and government contractors handling classified projects. Meets GDPR, HIPAA, CCPA, and corporate security policies by ensuring files never cross borders or third-party systems.

Can I convert VSI to CG4 online?

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

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

The best way to change VSIs 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 VSI to CG4.

How can I automate VSI 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 VSI 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 vsi to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert PDFAdd watermark on imageConvert Gerber imagesConvert RGB to CMYKTrace images to vector

Related conversions

Other ways to convert VSI files, and other sources that convert to CG4.

VSI to TIFFVSI to PNGVSI to JPGDICOM to CG4ETS to CG4LIF to CG4
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