Convert ST4 to ICO

Convert ST4 to ICO without quality loss. reaConverter gives you full control over resolution, compression, and output settings.

Manual ST4 to ICO conversion wastes hours. reaConverter automates the process — just add files and click Convert. Everything happens offline on your computer — no uploads, no cloud risks.

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How to Convert Multiple ST4 Files to ICO?

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 ST4 files

Open reaConverter and add your ST4 files. You can load individual files, entire folders, or even nested subfolders.

Drop your ST4 files into the window or use File menu to browse and select folders.

Load your ST4 files into reaConverter

3. Select ICO as output format

Choose ICO as the target format. Pick a destination folder or let reaConverter save files alongside the originals.

Select ICO as output format

4. Start ST4 to ICO conversion

Hit Convert and let reaConverter do the work. The progress window shows status for each file in real time.

Start Conversion

After conversion, find your ICO files in the output folder. Click 'Show converted files' to open it directly.

ST4 to ICO Converter

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

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on January 20, 2026
"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
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"I was skeptical at first, but reaConverter exceeded my expectations. The interface is intuitive, and the advanced settings let me tweak outputs perfectly. Plus, the customer support is fantastic!"
Sarah Lane
Sarah Lane
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"This software just works! My old laptop can’t handle Photoshop, but reaConverter flies through conversions without breaking a sweat. Wi-Fi gone? Still strong!"
Robert Williams
Robert Williams
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"Rare software that actually does it all! Converts anything, beautiful interface, and never lets me down. A must-have!"
Henry R.
Henry R.
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"For cross-platform compatibility, JPEG remains the gold standard. reaConverter’s precision conversions ensure perfect results every time, whether for presentations, websites, or client deliverables."
Paul Baker
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ST4 to ICO 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 ICO files?

ICO files contain the images used as icons for files, folders or programs on the Microsoft Windows platform. The icons appear on the desktop, in Windows Explorer or in the Start Menu and help identify each item. ICO images are generally of a small size, are scalable, and they can also serve as website logos or symbols that appear in the web browser next to the URL. The equivalent of ICO files on Mac computers is called ICNS.

Can reaConverter convert ST4 to ICO?

Yes! reaConverter instantly converts .st4 to .ico 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 ICO online?

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

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

The best way to change ST4s to ICOs 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 ICO.

How can I automate ST4 to ICO 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 ICO using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line st4 to ico converter for batch processing.

What else can I do with reaConverter?

Copy metadata (EXIF, IPTC)Change format settingsChange DPISet manual file dateConvert Gerber files

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