Convert GUN to FITS

Tired of slow online converters? reaConverter transforms GUN to FITS instantly — right on your desktop, no upload needed.

Need to convert GUN to FITS? reaConverter handles batch conversion with ease, processing hundreds of files at once while preserving quality. Your files never leave your machine. No third-party servers, no privacy concerns.

1. Download and Install reaConverter

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

Install reaConverter

2. Load your GUN files

Launch reaConverter and load the GUN files you want to convert. Add a few files or thousands, batch processing handles them all.

Drag-and-drop GUNs directly into reaConverter or use the folder browser to load entire directories.

3. Select FITS as output format

Set FITS as output format and select where to save your converted files. Customize quality settings if needed.

4. Start GUN to FITS conversion

Press Convert to begin processing. You can watch the progress or minimize and let it run in the background.

Your converted FITS files will appear in the destination folder as soon as processing completes.

GUN to FITS Converter

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

Download Free Trial

Do more with your files

Converting GUN 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

User Reviews

Average User Rating:
Last updated on January 25, 2026

"reaConverter makes FITS conversion incredibly easy. We batch convert astronomical images to standard formats for presentations and analysis, all automated through the command-line. It’s fast, reliable, and handles large datasets without issues."

Laura N.

Astrophysics Research Assistant

"Essential for our astroimaging pipeline! reaConverter perfectly handles FITS files from our research telescope, preserving all WCS coordinates and photometric data during batch conversion to TIFF. Now we process 100+ deep-sky exposures nightly without losing critical metadata for our exoplanet studies!"

Joseph Wilson

Satisfied Customer

"Finally an app that actually opens my weird files! Saves me from format frustration daily."

Kyle Brooks

Happy User

"This converter delivers exceptionally quick format conversions with reliable results every time."

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

Healthcare IT

"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.

IT Solutions Architect

GUN to FITS Conversion: FAQ

Can reaConverter convert GUN to FITS?

Yes! reaConverter instantly converts .gun to .fits 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 GUN to FITS online?

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

How can I turn GUN files into FITS on my computer?

The best way to change GUNs to FITSs 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 GUN to FITS.

How can I automate GUN to FITS 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 GUN files to FITS using the command prompt?

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

What else can I do with reaConverter?

Convert vector images Convert picture color space Convert RAW photo formats Convert Gerber images Crop picture