FIT Converter

Got hundreds of FIT files to convert? reaConverter handles entire folders in minutes, not hours.

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FIT Files
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FITConverter

How to Convert .fit Images in Bulk

1. Install reaConverter

Download reliable FIT conversion software to convert multiple .fit files and folders in one go.
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Install reaConverter

2. Select FIT Files

Select FITs from a folder or drag and drop them into reaConverter, then choose the desired output format.
reaConverter - Load FIT files

3. Start Conversion

Click Convert to start the bulk conversion of all selected FIT images. The process will begin right away.
reaConverter - Start FIT conversion

Convert FIT on your PC

For quick and effortless FIT file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.

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Do more with your images

Converting FIT images for use in a workflow? Touch up, transform, apply editing and effects to your images during conversion.

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
Image editing

User Reviews

Average User Rating:
Last updated on January 27, 2026
"reaConverter perfectly processes FIT files from our observatory telescopes into TIFFs while preserving all celestial metadata and sensor calibration data. Finally, we can batch-convert night-sky captures without losing a single photon of data fidelity!"
Prof. William S. Davis
Prof. William S. Davis
Satisfied Customer
"reaConverter is pure gold! Rock-solid performance with zero crashes. No internet needed—perfect for travel or low-connectivity work. The ultimate offline alternative to sketchy web converters. Plus, the desktop version keeps sensitive files secure since nothing ever gets uploaded to the cloud."
Malik T. Martin
Malik T. Martin
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
Roger Cook
Happy User
"Before reaConverter, I was the ‘File Conversion Guy’ at work — a title I never asked for and definitely didn’t want. Then I found the Watch Folders feature, and suddenly I was free! Now, files convert themselves while I sip coffee and pretend I'm still working hard. My coworkers think I'm a wizard. Thanks reaConverter, for saving my sanity and boosting my fake productivity!"
Ben H.
Ben H.
Overwhelmed Office Hero
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"The step-by-step video makes conversion foolproof. I'd recommend this to my grandma - it's that well-explained!"
DeShawn M. Thompson
DeShawn M. Thompson
Happy User

FIT images: Frequently Asked Questions

What are FIT files?

FIT (Flexible Image Transport System) is a digital file format commonly used in astronomy to store and share astronomical images and data. FIT files can contain multiple images or data arrays, as well as metadata about the images, such as the exposure time, telescope used, and filters used. FIT files are widely supported by astronomy software and can be easily converted into other formats if needed.

Can reaConverter open FIT files?

reaConverter fully supports the FIT image format – open, edit, and export FIT files to any other popular file format with ease.

How do I change FIT to another format?

reaConverter is a user-friendly tool for converting FIT files. Once installed on your computer, it allows you to convert all your .fit files at once with just a few clicks. You can even convert fit images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert FIT online?

If you only want to convert a few FIT images, you are welcome to try our free online FIT converter.

How can I turn FIT files on my computer to another format?

The best way to convert FIT images on your PC is to get 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 FIT.

How can I automate FIT files conversion?

reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.

Can I convert FIT files using scripts or the command-line interface?

reaConverter provides full access to all its features from the Windows command-line shell, including the command-line fit converter.

What else can I do with reaConverter?

Convert Gerber filesCrop imagesCopy IPTC dataConvert vector filesConvert RGB to CMYK

What formats can I convert a FIT file to?
ai  apng  avif  bmp  bpg  cal  cg4  cgm  cin  dcm  dcx  dds  dgn  dis  drw  dwf  dwg  dxf  emf  epi  eps  fax  fits  flif  gbr  gif  hpg  hru  ico  iff  iges  igs  jp2  jpeg  jpg  jxl  jxr  mif  mtv  pcl  pct  pcx  pdf  pgm  pic  plt  png  ppm  prc  ps  psd  qoi  qrt  rad  rla  sgi  shp  svg  svgz  tga  tif  tiff  webp  webpll  wmf  wmz  wpg  wrl  xbm  xpm 

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Explore our efficient FIT file converter that saves you time and effort by converting multiple .fit files into different formats.
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