FITS Converter

Get reaConverter, our fast and easy FITS image converter software. It will help you to convert multiple .fits files in one go.

FITSConverter

How to Convert .fits Images in Bulk

1. Install reaConverter

Download reliable FITS conversion software to convert multiple .fits files and folders in one go.

2. Select FITS Files

Select FITSs from a folder or drag and drop them into reaConverter, then choose the desired output format.
reaConverter - Load FITS files

3. Start Conversion

Click Convert to start the bulk conversion of all selected FITS images. The process will begin right away.
reaConverter - Start FITS conversion

Convert FITS on your PC

For quick and effortless FITS file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.

Do more with your images

Converting FITS images for use in a workflow? Touch up, transform, apply editing and effects to your images during conversion.

Our range of editing options includes such image processing actions as Resize, Rotate, Crop, Color Replace, Watermarks and more. Adjust actions include RGB, HLS, HSV, Brightness and Contrast. Auto-processing options are also available, such as auto-rotate and auto-crop.

Image editing

User Reviews

Average User Rating:
Last updated on April 25, 2025
"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
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Joseph Wilson
Satisfied Customer
"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
"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.
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Laura N.
Astrophysics Research Assistant
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
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J. Mitchell
Satisfied Customer
"We use reaConverter in our department to handle image and document conversions for multiple teams. The Watch Folders function is brilliant — I configured different folders for different workflows, and now everything happens automatically in the background. No more manual conversions or missed files. Rock-solid performance!"
James L.
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James L.
IT Manager
"I deal with hundreds of images daily, and reaConverter has been a lifesaver. The Watch Folders feature lets me automate file conversions without lifting a finger. I set up a folder for incoming files and it automatically resizes, renames, and converts them into the formats I need. It's like having a personal assistant!"
Sarah T.
⭐⭐⭐⭐⭐
Sarah T.
Graphic Designer

FITS images: Frequently Asked Questions

Can reaConverter open FITS files?

reaConverter fully supports the FITS image format – open, edit, and export FITS files to any other popular file format with ease.

How do I change FITS to another format?

reaConverter is a user-friendly tool for converting FITS files. Once installed on your computer, it allows you to convert all your .fits files at once with just a few clicks. You can even convert fits images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert FITS online?

If you only want to convert a few FITS images, you are welcome to try our free online FITS converter.

How can I turn FITS files on my computer to another format?

The best way to convert FITS images on your PC is to get 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 FITS.

How can I automate FITS files conversion?

reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.

Can I convert FITS files using scripts or the command-line interface?

reaConverter provides full access to all its features from the Windows command-line shell, including the command-line fits converter.

What else can I do with reaConverter?

Convert PDF filesWatermark photosChange format settingsChange DPIConvert GIS files

What formats can I convert a FITS file to?
What types of files can I convert to FITS format?

Discover more

Explore our efficient FITS file converter that saves you time and effort by converting multiple .fits files into different formats.
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