Convert ST4 to FAX

ST4 to FAX made simple. Add files or folders, pick your settings, click Convert. reaConverter handles the rest — even thousands of files.

Tired of converting ST4 files one at a time? reaConverter processes entire folders to FAX automatically. Handles large batches reliably without crashes or timeouts.

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How to Convert Multiple ST4 Files to FAX?

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

Launch reaConverter and drop in your ST4 files. The software queues everything for batch processing with consistent settings.

Add files by dragging them in, browsing folders, or using the right-click menu from Windows Explorer.

Load your ST4 files into reaConverter

3. Select FAX as output format

Pick FAX as output format and choose the destination folder where you want to save new .fax files.

Select FAX as output format

4. Start ST4 to FAX conversion

Then simply press the Convert button and your conversion will begin in no time!

Start Conversion

Once the conversion is complete, you can find your FAX files in the destination folder you selected.

ST4 to FAX Converter

reaConverter offers the fastest, simplest solution for converting your ST4 files into FAX 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 21, 2026
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"Security was our top concern when evaluating file conversion tools. reaConverter’s offline mode and role-based access controls let us lock it down for sensitive environments. No unexpected network calls or bloat — just clean, fast conversions. Even passed our pen-testing scans without a hitch."
Marcus White
Marcus White
Healthcare IT
"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

ST4 to FAX 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 FAX files?

FAX files contain incoming or outgoing fax images created using specialized software, usually as part of a fax machine or a computer with a fax modem. This format is a fixed width Group 3 TIFF saved in black&white colors.

Can reaConverter convert ST4 to FAX?

Yes! reaConverter instantly converts .st4 to .fax 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 FAX online?

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

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

The best way to change ST4s to FAXs 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 FAX.

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

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

What else can I do with reaConverter?

Convert vector filesConvert picture color spaceConvert DICOM filesResize photoConvert RAW photo formats

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