FIT Converter

Got hundreds of FIT files to convert? reaConverter handles entire folders in minutes rather than 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 June 29, 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
"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
"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
Richard E. Miller
Satisfied Customer
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!"
Logan B.
Logan B.
Satisfied Customer
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
J. Mitchell
Satisfied Customer

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  cit  dcm  dcx  dds  dgn  dis  drw  dwf  dwg  dxf  emf  epi  eps  fax  fits  flif  gbr  gif  glb  gltf  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  step  stl  stp  svg  svgz  tga  tif  tiff  u3d  webp  webpll  wmf  wmz  wpg  wrl  x3d  xbm  xpm 

Beyond FIT conversion

Convert .fit files in batches of any size, with editing and processing applied along the way. The same tool also handles 700+ other formats, including CAD, medical imaging, and GIS.
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Free trial · Windows 10/11 · 64-bit · v8.0.241 · Files never leave your computer
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