Convert J2K to FITS

For a hassle-free and effective conversion of your J2K files to FITS format, it is recommended to utilize a trusted software tool like reaConverter.

reaConverter is a fast offline J2K to FITS converter. Whether you need to convert hundreds or thousands of J2K files, reaConverter can handle it all.

J2KFITS

How to Convert Multiple J2K Images to FITS?

1. Download and Install reaConverter

reaConverter is quick to download, install and launch. This standalone software is extremely efficient in managing a wide range of batch conversions. At the same time, it will allow you to apply image editing options during conversion.

2. Load your J2K files

Start reaConverter and load all the .j2k files you intend to convert into .fits. The software supports multiple J2K conversion and processes all files locally on your computer.

Select J2Ks from a folder or by drag-and-dropping them directly into the reaConverter window.

Load your J2K files into reaConverter

3. Select FITS as output format

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

Select FITS as output format

4. Start J2K to FITS conversion

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

Screenshot

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

J2K to FITS offline

reaConverter offers the fastest, simplest solution for converting your J2K files into FITS in seconds - all images processed on your PC for maximum privacy and speed.

Do more with your images

Converting J2K images for use in a larger project? With reaConverter, you can convert, edit, and enhance your images in one streamlined process.

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 23, 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
Satisfied Customer
"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
"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
"An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!"
Logan B.
Satisfied Customer

J2K to FITS Conversion: FAQ

Can reaConverter convert J2K to FITS?

Yes! reaConverter instantly converts .j2k 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.

What is reaConverter used for?

reaConverter is a software program used for converting images and other types of files from one format to another. It supports a wide range of file formats and allows users to convert multiple files at once, making it a valuable tool for graphic designers, photographers, and other professionals who work with digital images. reaConverter also includes features for resizing, cropping, and editing images, along with batch processing capabilities that help automate repetitive tasks.

Can I convert J2K to FITS online?

If you only need to convert a few J2K files to FITS format, feel free to try our free online free online J2K to FITS converter — perfect for small batches with no installation needed!

How can I turn J2K files into FITS on my computer?

The best way to change J2Ks 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 J2K to FITS.

How can I automate J2K 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 J2K 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 j2k to fits converter for batch processing.

What else can I do with reaConverter?

Convert vector filesConvert picture color spaceConvert DICOM filesResize photoChange file date

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