Convert IFF to FITS

Why upload sensitive IFF files to online converters? reaConverter processes everything locally — convert to FITS with zero cloud risk.

Batch IFF to FITS conversion doesn't have to be complicated. reaConverter processes entire folders with consistent quality settings. Works offline with no internet required — convert anywhere, anytime.

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting IFF files in under two minutes. reaConverter also includes editing tools: resize, crop, rotate, and more.

Install reaConverter

2. Load your IFF files

Open reaConverter and import your .iff files. No file limits, no slowdowns. Add as many as you need.

Drag files into the window, use the Add Files button, or select entire folders.

3. Select FITS as output format

Select FITS as target format and pick where to save results. You can keep default settings or fine-tune the output.

4. Start IFF to FITS conversion

Hit Convert to process your files. The log window shows progress, timing, and status for every file.

Conversion complete? Your FITS files are saved to the destination folder, ready to use.

IFF to FITS Converter

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

Download Free Trial

Do more with your images

Converting IFF 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 tools

User Reviews

Average User Rating:
Last updated on January 20, 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

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

Elena Anderson

Happy User

"Enable shell integration for lightning-fast file conversions directly from Windows Explorer."

R. Lewis

Happy User

"After 200+ conversions on my budget laptop (i3-1115G4/4GB RAM/Win11), reaConverter outperforms heavyweight tools. Zero crashes, low CPU usage during batch processing, and no internet dependency - exactly what professionals need."

Walter Morgan

Satisfied Customer

"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

IFF to FITS Conversion: FAQ

Can reaConverter convert IFF to FITS?

Yes! reaConverter instantly converts .iff 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 IFF to FITS online?

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

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

The best way to change IFFs 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 IFF to FITS.

How can I automate IFF 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 IFF 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 iff to fits converter for batch processing.

What else can I do with reaConverter?

Convert GIS files Convert RAW files Convert Gerber files Crop photos Convert PDF files