GTIFF → FITS · Windows

Convert GTIFF to FITS

GTIFF to FITS for whole archives of tiles, layers or survey files at once, with nothing uploaded and no account required.

Online converters too slow for your GTIFF files? reaConverter works locally and handles unlimited batches. All processing runs locally on your PC, so your files stay private and secure. Surveyors and planners use it to pass GIS data to colleagues who work in other software.

.gtiff.FITS
4.8

Converting files since 2001

Runs offline — nothing uploaded

Read what our users say →

How to Convert Multiple .gtiff Files to .fits?

1. Download and Install reaConverter

Download reaConverter and install it in seconds. The setup is straightforward — no complex configuration, no extra software required.

2. Load your GTIFF files

Add GTIFF files to reaConverter. One file or a thousand, the process is the same. Everything runs locally on your machine.

You can drag-and-drop files, browse to a folder, or add entire directory trees including subfolders.

Load your GTIFF files into reaConverter

3. Select FITS as output format

Pick FITS as the output format. Set the destination folder and optionally configure resolution, quality, or file naming.

Select FITS as output format

4. Start GTIFF to FITS conversion

Click the Convert button to start. reaConverter will process all your files with the settings you selected.

Start Conversion

When finished, your new .fits files will be waiting in the destination folder.

Step by step

How It Works

reaConverter offers the fastest, simplest solution for converting your GTIFF files into FITS without GIS software - all files processed on your PC for maximum privacy and speed.

Technical note

GTIFF to FITS: what to expect from the conversion

GTIFF can carry an alpha channel and FITS cannot. Transparent areas are composited onto a solid background during conversion, so pick that background colour deliberately: white is the default, and it is rarely the right choice for a logo that will sit on a dark page.

Map Data Workflow

Turn GIS data into something anyone can open

Not everyone who needs to see GTIFF data has GIS software. reaConverter renders it to FITS for a report, an email or a slide, and handles a whole folder in one run.

  • Render every file in a folder to FITS with the same size and settings
  • Set DPI and output dimensions before the run, not afterwards
  • Pick up new data automatically with Watch Folders, or script the job from the command line

Everything runs on your PC, which matters for cadastral, utility and client data that should not pass through an upload form.

GIS data conversion

User reviews

What people say after the first batch

Average User Rating:4.8
Last updated on September 28, 2026
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
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
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
Converts files in seconds! Finally a tool that's both fast and simple to use.
Wei Chen
Wei Chen
Happy User
I'd been searching for reliable conversion software forever — reaConverter has everything I need! After installing and watching the tutorial, I had my files converted to the perfect format in minutes. Flawless experience!
Sanjay Mehta
Sanjay Mehta
Satisfied Customer
An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!
Logan B.
Logan B.
Satisfied Customer

FAQ

GTIFF to FITS Conversion

Can reaConverter convert GTIFF to FITS?

Yes! reaConverter instantly converts .gtiff 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 GTIFF files directly from Windows Explorer using the right-click menu — fast and convenient.

What is reaConverter used for?

reaConverter is a Windows converter for 800+ formats, GIS data among them. For GTIFF to FITS it replaces the usual detour through QGIS, ArcGIS or ogr2ogr: add the files, pick the output format, and the whole batch converts offline. Surveyors, planners and engineering teams use it to pass data between GIS, CAD and everyday document formats.

Why choose offline conversion with reaConverter?

reaConverter is a software program that is used for offline files conversion. Your proprietary documents never leave your computer – essential for architects, engineers, healthcare and government contractors handling classified projects. Meets GDPR, HIPAA, CCPA, and corporate security policies by ensuring files never cross borders or third-party systems.

Can I convert GTIFF to FITS online?

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

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

The best way to change GTIFFs 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 GTIFF to FITS.

How can I automate GTIFF 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 GTIFF 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 gtiff to fits converter for batch processing.

What else can I do with reaConverter?

Convert raster to vectorChange bit depthConvert Gerber imagesConvert RGB to CMYKConvert microscopy files

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