Convert SID to FITS

Need to convert hundreds of SID files to FITS? reaConverter does it in one click. No file limits, no watermarks, no internet required.

Need to convert SID to FITS? reaConverter handles batch conversion with ease, processing hundreds of files at once while preserving quality. Your files never leave your machine. No third-party servers, no privacy concerns.

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SID to FITS
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SIDFITS

How to Convert Multiple SID Files to FITS?

1. Download and Install reaConverter

reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately.

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Install reaConverter

2. Load your SID files

Launch reaConverter and load the SID files you want to convert. Add a few files or thousands, batch processing handles them all.

Drag-and-drop SIDs directly into reaConverter or use the folder browser to load entire directories.

Load your SID files into reaConverter

3. Select FITS as output format

Set FITS as output format and select where to save your converted files. Customize quality settings if needed.

Select FITS as output format

4. Start SID to FITS conversion

Press Convert to begin processing. You can watch the progress or minimize and let it run in the background.

Start Conversion

Your converted FITS files will appear in the destination folder as soon as processing completes.

SID to FITS Converter

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

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Do more with your files

Converting SID 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

Average User Rating:
Last updated on January 25, 2026
"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
"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
"This software just works! My old laptop can’t handle Photoshop, but reaConverter flies through conversions without breaking a sweat. Wi-Fi gone? Still strong!"
Robert Williams
Robert Williams
Happy User
"Rare software that actually does it all! Converts anything, beautiful interface, and never lets me down. A must-have!"
Henry R.
Henry R.
Happy User
"For cross-platform compatibility, JPEG remains the gold standard. reaConverter’s precision conversions ensure perfect results every time, whether for presentations, websites, or client deliverables."
Paul Baker
Paul Baker
Happy User
"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

SID to FITS Conversion: FAQ

What are SID files?

MrSID (Multiresolution Seamless Image Database) is a compressed raster format for high-resolution geospatial imagery. Developed by LizardTech, it uses wavelet compression to efficiently store aerial/satellite images, maps, and large documents while supporting fast zooming and geospatial data.

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 SID to FITS?

Yes! reaConverter instantly converts .sid 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 SID to FITS online?

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

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

The best way to change SIDs 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 SID to FITS.

How can I automate SID 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 SID 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 sid to fits converter for batch processing.

What else can I do with reaConverter?

Change format settingsChange DPISet manual file dateConvert DICOM filesChange photo size

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