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FIT Converter
FIT conversion in your browser, free and unlimited. Files never leave your machine. reaConverter for Windows handles the other 800+ formats in batch.
How to Convert .fit Images in Bulk
1. Install reaConverter
2. Select FIT Files
3. Start Conversion
Step by step
See It in Action
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.
Edit & Enhance
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.
User reviews
From those who tried it
Average User Rating:Last updated on July 31, 2026
Questions & Answers
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?
Trace images to vectorChange bit depthConvert GIS filesConvert vector filesChange picture DPI
What formats can I convert a FIT file to?
Discover More
Beyond FIT conversion
Convert .fit files in batches of any size, with editing and processing applied along the way. The same tool also handles 800+ other formats, including CAD, medical imaging, and GIS.
