CZI → FITS · Windows

Convert CZI to FITS

Convert CZI files to FITS on the machine they already sit on. Nothing is uploaded, and there is no limit on file size.

Got a folder full of CZI files? reaConverter batch converts them to FITS in minutes, not hours. Local processing means instant results, even with thousands of files. Built for volume, so an entire experiment converts with identical settings.

DownloadCZI to FITS ConverterConvert
CZI to FITS
Online
CZIFITS
4.8

Converting files since 2001

Runs offline — nothing uploaded

Read what our users say →

How to Convert Multiple CZI Files to FITS?

1. Download and Install reaConverter

Install reaConverter and work with CZI files directly. Setup takes under a minute and needs nothing else on the machine.

reaConverter logo
Install reaConverter

2. Load your CZI files

Add your CZI acquisitions to reaConverter. Point it at the folder your microscope writes to and load the whole run at once.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your CZI files into reaConverter

3. Select FITS as output format

Pick FITS as the output format. TIFF is the usual choice for anything heading into analysis or a journal submission, while JPG and PNG suit slides and the web.

Select FITS as output format

4. Start CZI to FITS conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your FITS files are ready in the destination folder you chose earlier.

Step by step

How It Works

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

Download reaConverter

Technical note

What changes when you convert CZI to FITS

CZI is an N-dimensional acquisition rather than a picture. One file can hold several fluorescence channels, a stack of focal planes, a time series and a mosaic of stitched tiles, each recorded separately by the camera. FITS is a flat image format, so those dimensions have to be resolved into ordinary pictures, and which result is the right one depends on the work: a merged colour composite suits a figure or a presentation, while separate greyscale planes are what quantification needs.

Deep Customization

Do more with your files

Converting CZI 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
Image editing

User reviews

What people say after the first batch

Average User Rating:4.8
Last updated on August 20, 2026
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.
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
Joseph Wilson
Satisfied Customer
Creating marketing materials for various platforms requires multiple file versions from single sources. reaConverter's workflow automation lets us generate PNG, JPEG, and SVG variants from AI and PSD files simultaneously. The color profile management ensures brand consistency across all outputs, and the processing speed allows for last-minute changes without delaying deadlines.
Rebecca Turner
Rebecca Turner
Marketing Agency CEO
I was drowning in mismatched file formats until I found reaConverter. The one-click conversion and editing tools simplified everything, and the pricing is reasonable for small businesses. Now I spend less time troubleshooting and more time growing my brand!
Emily K.
Emily K.
E-commerce Entrepreneur
This program is incredibly simple and user-friendly, even beginners can use it with ease. It supports batch processing, works offline, and runs smoothly on my aging Acer Aspire laptop. Best of all, the output quality is outstanding!
Kevin Harris
Kevin Harris
Happy User
An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness.
Elena Anderson
Elena Anderson
Happy User

FAQ

CZI to FITS Conversion

What are CZI files?

CZI (Carl Zeiss Image) is the native image format of ZEISS ZEN microscopy software. It stores multidimensional acquisitions with channels, z-stacks, time series and mosaic tiles, together with the full set of instrument and acquisition metadata.

What are FITS files?

The FITS (Flexible Image Transport System) format is a standard format used particularly for storing, transferring and processing scientific images from fields such as astronomy. FITS was first launched as an open standard in the early 1980s and has gone through several subsequent upgrades. FITS files contain not just images, but also data related to photometry and spatial calibration, and information about the origin of the image. Similar formats include FIT and FTS.

Can reaConverter convert CZI to FITS?

Yes! reaConverter instantly converts .czi 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 CZI to FITS online?

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

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

The best way to change CZIs 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 CZI to FITS.

How can I automate CZI 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 CZI 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 czi to fits converter for batch processing.

What else can I do with reaConverter?

Convert DICOM imagesCrop photoConvert microscopy filesResize imageConvert CAD formats

Related conversions

Other ways to convert CZI files, and other sources that convert to FITS.

CZI to TIFFCZI to PNGCZI to JPGDICOM to FITSETS to FITSLIF to FITS
All CZI conversionsAll FITS conversions

Discover More

Beyond format conversion

Batch conversion, editing, and processing across 700+ formats, from RAW and HEIC to DICOM, DWG, and PDF. Everything runs locally, with no cloud and no upload limits.

DownloadreaConverterPurchase

Free trial · Windows 10/11 · v8.0.245 · Files never leave your computer

reaConverter software