Convert JJ to FITS

By using our efficient and user-friendly JJ to FITS converter, you can save yourself from the tiresome process of manually converting numerous .jj files into fits format for hours.

reaConverter is a popular JJ to FITS conversion software. Whether you need to convert hundreds or thousands of .jj files, reaConverter can handle it all.

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. reaConverter is incredibly powerful and boasts an extensive variety of features.

Install reaConverter

2. Load your JJ files

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

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

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.

4. Start JJ to FITS conversion

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

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

JJ to FITS Converter

reaConverter offers the fastest, simplest solution for converting your JJ 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 JJ 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 May 24, 2025

"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

"An excellent program! I use it regularly in my work - it supports nearly every file format imaginable. The interface is intuitive and runs flawlessly every time."

Roger Cook

Happy User

"For agencies handling confidential data, reaConverter eliminates cloud-upload risks while delivering unmatched conversion reliability. Our team uses it both in-office and remotely with identical results."

Jamal Bailey

Satisfied Customer

"Our volunteer team uses reaConverter to prepare images for fundraising campaigns. The learning curve was minimal, and the results are professional-grade. The customer support team even helped us customize a workflow — fantastic service!"

Jason P. Bailey

Non-Profit Coordinator

"An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness."

Elena Anderson

Happy User

JJ to FITS Conversion: FAQ

Can reaConverter convert JJ to FITS?

Yes! reaConverter instantly converts .jj 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 JJ to FITS online?

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

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

The best way to change JJs 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 JJ to FITS.

How can I automate JJ 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 JJ 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 jj to fits converter for batch processing.

What else can I do with reaConverter?

Set file date Convert GIS files Convert CAD formats Set picture bit depth Convert Gerber images