Convert BIG to FITS

Convert BIG to FITS without uploading files anywhere. reaConverter works entirely on your PC — fast, private, and handles thousands of files at once.

Looking to change BIG files to FITS 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.

1. Download and Install reaConverter

Download reaConverter and install it in seconds. The setup is straightforward — no complex configuration, no extra software required.

Install reaConverter

2. Load your BIG files

Start reaConverter and add your .big 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.

3. Select FITS as output format

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

4. Start BIG to FITS conversion

Click Convert to start the batch. reaConverter processes files quickly and shows you the status of each one.

Once done, reaConverter shows a summary. Click 'Show converted files' to jump straight to your FITS output.

BIG to FITS Converter

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

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Do more with your files

Converting BIG 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 19, 2026

"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

"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

"So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!"

Kenneth D. Carter

Satisfied Customer

"I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!"

Mark T.

Satisfied Customer

"Your solution was buried deeper in search results than it should be. After struggling with unclear alternatives, I found your guides — finally, instructions that made sense for a first-time user like me. Excellent work!"

Richard E. Miller

Satisfied Customer

BIG to FITS Conversion: FAQ

Can reaConverter convert BIG to FITS?

Yes! reaConverter instantly converts .big 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 BIG to FITS online?

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

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

The best way to change BIGs 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 BIG to FITS.

How can I automate BIG 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 BIG 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 big to fits converter for batch processing.

What else can I do with reaConverter?

Convert RAW files Convert Gerber files Crop images Copy IPTC data Convert GIS files