Convert ST6 to CAL

Bulk ST6 to CAL conversion with consistent results. Set it up once, process thousands of files with the same quality every time.

Looking to change ST6 files to CAL 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.

Download
reaConverter
Convert
ST6 to CAL
Online
Convert

How to Convert Multiple ST6 Files to CAL?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting ST6 files in under two minutes.

reaConverter logo
Install reaConverter

2. Load your ST6 files

Start reaConverter and add your .st6 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 ST6 files into reaConverter

3. Select CAL as output format

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

Select CAL as output format

4. Start ST6 to CAL 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 CAL output.

ST6 to CAL Converter

reaConverter offers the fastest, simplest solution for converting your ST6 files into CAL in seconds - all files processed on your PC for maximum privacy and speed.

Download Free Trial

Do more with your files

Converting ST6 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 25, 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
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
J. Mitchell
Satisfied Customer
"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
Satisfied Customer
"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
Satisfied Customer

ST6 to CAL Conversion: FAQ

What are ST6 files?

The ST6 format is part of a group of extensions called Santa Barbara Instruments Astronomical Images, also including ST5, ST7, ST8 and STX. All these types of files represent RAW images created using the SBIG CCD ST-X camera. This is a specialized brand used in some areas of astronomy, medical imaging or other scientific and industrial domains with similar needs.

What are CAL files?

A CAL image file represents a monochrome bitmap image that uses the CALS raster image standard for storing graphics data. This standard was created in the 1980s by the US Department of Defence as a compressed interchangeable image format. CAL and CALS are extensions used for similar purposes.

Can reaConverter convert ST6 to CAL?

Yes! reaConverter instantly converts .st6 to .cal 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 ST6 to CAL online?

If you only need to convert a few ST6 files to CAL format, feel free to try our free online free online ST6 to CAL converter — perfect for small batches with no installation needed!

How can I turn ST6 files into CAL on my computer?

The best way to change ST6s to CALs 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 ST6 to CAL.

How can I automate ST6 to CAL 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 ST6 files to CAL using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line st6 to cal converter for batch processing.

What else can I do with reaConverter?

Convert vector imagesConvert picture color spaceCopy IPTC dataConvert CAD formatsSet image bit depth

Find out more

Get advanced software for file conversion, processing, and editing, giving you complete, precise control over your work.
Download
reaConverter
Buy Now
reaConverter software