Convert HDRU to FITS

With our fast and user-friendly HDRU to FITS converter, you can steer clear of the tedious task of manually converting multiple .hdru files into fits format for hours on end.

reaConverter is an offline software designed for batch .hdru to .fits conversion and editing. It supports a wide range of file formats and can convert multiple files at once.

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HDRU to FITS
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How to Convert Multiple HDRU Files to FITS?

1. Download and Install reaConverter

reaConverter is quick to download, install and launch. This standalone software is extremely efficient in managing a wide range of batch conversions. reaConverter is incredibly powerful and boasts an extensive variety of features.

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Install reaConverter

2. Load your HDRU files

Start reaConverter and load all the .hdru files you intend to convert into .fits. The software supports multiple HDRU conversion and processes all files locally on your computer.

Select HDRUs from a folder or by drag-and-dropping them directly into the reaConverter window.

Load your HDRU files into reaConverter

3. Select FITS as output format

Pick the FITS as output format and choose the destination folder where you want to save new .fits files.

Select FITS as output format

4. Start HDRU to FITS conversion

Then simply press Convert button and your conversion will begin in no time!

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Once the conversion is complete, you can find your FITS files in the destination folder you selected.

HDRU to FITS offline

reaConverter offers the fastest, simplest solution for converting your HDRU 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 HDRU 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 April 24, 2025
"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
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.
Astrophysics Research Assistant
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
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
Healthcare IT
"5/5★ Finally! Does what it promises—converts AND tweaks images without complicated menus. Perfect for quick jobs."
J. Mitchell
Satisfied Customer

HDRU to FITS Conversion: FAQ

What are HDRU files?

HDRU is a rare image format associated with a currently obsolete image handling program called Apollo HRDU. HDRUs are considered old and uncommon, and are difficult to open with regular image viewers, but in case you found one it's probably best to convert to a more accessible extension, such as JPG or PNG.

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 HDRU to FITS?

Yes! reaConverter instantly converts .hdru 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 HDRU to FITS online?

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

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

The best way to change HDRUs 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 HDRU to FITS.

How can I automate HDRU 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 HDRU 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 hdru to fits converter for batch processing.

What else can I do with reaConverter?

Convert vector filesConvert picture color spaceCopy IPTC dataConvert Gerber filesCrop picture

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