FIT Converter

Try our offline FIT image converter. Every year thousands of users around the world save thousands of hours using reaConverter!

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FIT Files
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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

User Reviews

Average User Rating:
Last updated on February 27, 2025
"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
Satisfied Customer
"For agencies handling confidential data, reaConverter eliminates cloud-upload risks while delivering unmatched conversion reliability. Our team uses it both in-office and remotely with identical results."
Jamal Bailey
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
"My photography business relies on fast, accurate processing of images. With reaConverter’s Watch Folder, I drop my RAW photos into a folder and they’re instantly converted to high-res JPEGs with custom naming and watermarking. It’s streamlined my post-processing more than I imagined possible."
Emily R.
Photographer
"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
"Our volunteer team uses reaConverter to prepare images for fundraising campaigns. The learning curve was minimal, and the results are professional-grade. The customer support team even helped us customize a workflow — fantastic service!"
Jason P. Bailey
Non-Profit Coordinator

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 DICOM imagesResize pictureConvert vector imagesConvert picture color spaceCopy IPTC data

What formats can I convert a FIT file to?
ai  apng  avif  bmp  bpg  cal  cg4  cgm  cin  dcx  dds  dgn  dis  drw  dwf  dwg  dxf  emf  epi  eps  fax  fits  flif  gbr  gif  glb  gltf  hpg  hru  ico  iff  jp2  jpeg  jpg  jxl  jxr  mif  mtv  pcl  pct  pcx  pdf  pgm  pic  plt  png  ppm  prc  ps  psd  qoi  qrt  rad  riff  rla  sgi  shp  step  stl  stp  svg  svgz  tga  tif  tiff  webp  webpll  wmf  wmz  wpg  wrl  x3d  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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