Convert ST4 to BPG

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

ST4 to BPG conversion is faster with the right tool. reaConverter handles everything from a few files to thousands in one batch. Processes files consistently every time, with full control over quality and output settings.

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How to Convert Multiple ST4 Files to BPG?

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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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 BPG as output format

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

Select BPG as output format

4. Start ST4 to BPG 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 BPG files in the destination folder you selected.

ST4 to BPG Converter

reaConverter offers the fastest, simplest solution for converting your ST4 files into BPG 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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User Reviews

Average User Rating:
Last updated on January 21, 2026
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
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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!"
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"An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness."
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"Enable shell integration for lightning-fast file conversions directly from Windows Explorer."
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"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."
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ST4 to BPG 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 BPG files?

BPG is a new and promising image format, which currently provides the most advanced technology in image compression. Released in 2014 by software developer Fabrice Bellard, the BPG format has been shown to include the best quality/size ratio, when compared to other popular formats such as JPG or PNG. The number of image viewers that can open BPG files is currently limited, but is expected to grow in the near future. For easier access, conversion can be done to and from the BPG format.

Can reaConverter convert ST4 to BPG?

Yes! reaConverter instantly converts .st4 to .bpg 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 BPG online?

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

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

The best way to change ST4s to BPGs 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 BPG.

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

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

What else can I do with reaConverter?

Copy metadata (EXIF, IPTC)Convert GIS filesConvert DICOM filesImage resizerConvert PDF files

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