Convert TN1 to FITS

Tired of slow online converters? reaConverter transforms TN1 to FITS instantly — right on your desktop, no upload needed.

Need to convert TN1 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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TN1 to FITS
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How to Convert Multiple TN1 Files to FITS?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting TN1 files in under two minutes.

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Install reaConverter

2. Load your TN1 files

Launch reaConverter and load the TN1 files you want to convert. Add a few files or thousands, batch processing handles them all.

Drag-and-drop TN1s directly into reaConverter or use the folder browser to load entire directories.

Load your TN1 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 TN1 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.

TN1 to FITS Converter

reaConverter offers the fastest, simplest solution for converting your TN1 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 TN1 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.

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Image editing

User Reviews

Average User Rating:
Last updated on January 20, 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
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"Security was our top concern when evaluating file conversion tools. reaConverter’s offline mode and role-based access controls let us lock it down for sensitive environments. No unexpected network calls or bloat — just clean, fast conversions. Even passed our pen-testing scans without a hitch."
Marcus White
Marcus White
Healthcare IT
"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.
David R.
IT Solutions Architect

TN1 to FITS Conversion: FAQ

What are TN1 files?

TN1 is an archaic format associated with Atari ST — a brand of personal computers that used to be popular in the 1980s and 1990s. TN1s represent compressed bitmap images created or edited using image software designed for Atari computers, such as Tiny Stuff or Tiny View. Opening such files with currently available image viewers is probably difficult, so conversion might be the best option.

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 TN1 to FITS?

Yes! reaConverter instantly converts .tn1 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 TN1 to FITS online?

If you only need to convert a few TN1 files to FITS format, feel free to try our free online free online TN1 to FITS converter — perfect for small batches with no installation needed!

How can I turn TN1 files into FITS on my computer?

The best way to change TN1s 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 TN1 to FITS.

How can I automate TN1 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 TN1 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 tn1 to fits converter for batch processing.

What else can I do with reaConverter?

Convert vector filesConvert picture color spaceConvert RAW photo formatsConvert Gerber filesCrop picture

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