Convert JP2 to FITS

Online converters slow with large JP2 files? reaConverter converts to FITS on your desktop, with no upload and no queue.

Got a folder full of JP2 files? reaConverter batch converts them to FITS in minutes, not hours. Local processing means instant results, even with thousands of files.

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JP2FITS

How to Convert Multiple JP2 Images to FITS?

1. Download and Install reaConverter

First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed. reaConverter also includes editing tools: resize, crop, rotate, and more.

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2. Load your JP2 files

Add your JP2 files to reaConverter. Whether it's a handful or an entire archive, the batch engine processes them efficiently.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your JP2 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 JP2 to FITS conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your FITS files are ready in the destination folder you chose earlier.

How JP2 and FITS differ in practice

JP2 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. FITS is lossless, so nothing further is discarded during conversion. What it cannot do is restore detail that JP2 compression already removed, and the output file will usually be considerably larger.

JP2 to FITS Converter

reaConverter offers the fastest, simplest solution for converting your JP2 files into FITS in seconds - all images processed on your PC for maximum privacy and speed.

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Do more with your images

Converting JP2 images for use in a larger project? With reaConverter, you can convert, edit, and enhance your images in one streamlined process.

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.

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User Reviews

Average User Rating:4.8
Last updated on August 06, 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
"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
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"For agencies handling confidential data, reaConverter eliminates cloud-upload risks while delivering unmatched conversion reliability. Our team uses it both in-office and remotely with identical results."
Jamal Bailey
Jamal Bailey
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"Our volunteer team uses reaConverter to prepare images for fundraising campaigns. The learning curve was minimal, and the results are professional-grade. The customer support team even helped us customize a workflow — fantastic service!"
Jason P. Bailey
Jason P. Bailey
Non-Profit Coordinator
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
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JP2 to FITS Conversion: FAQ

What are JP2 files?

JP2 or JPEG 2000 is an improved version of JPEG, one of the most popular file formats for storing and transferring images. Compared to the latter, JP2 image files offer higher quality and smaller size images by using a different compression algorithm, which can be either lossy or lossless. JP2s are created using the JPEG2000 Core Coding application, but can also be obtained through conversion from other formats.

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 JP2 to FITS?

Yes! reaConverter instantly converts .jp2 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.

What is reaConverter used for?

reaConverter is a software program used for converting images and other types of files from one format to another. It supports a wide range of file formats and allows users to convert multiple files at once, making it a valuable tool for graphic designers, photographers, and other professionals who work with digital images. reaConverter also includes features for resizing, cropping, and editing images, along with batch processing capabilities that help automate repetitive tasks.

Can I convert JP2 to FITS online?

If you only need to convert a few JP2 files to FITS format, feel free to try our free online free online JP2 to FITS converter — perfect for small batches with no installation needed!

How can I turn JP2 files into FITS on my computer?

The best way to change JP2s 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 JP2 to FITS.

How can I automate JP2 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 JP2 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 jp2 to fits converter for batch processing.

What else can I do with reaConverter?

Change file dateConvert vector imagesConvert picture color spaceConvert PDFAdd text on pictures

JP2 and FITS: related conversions

Other ways to convert JP2 files, and other sources that convert to FITS.

FITS to JP2JP2 to JPGJP2 to PNGJP2 to PDFDICOM to FITSDIS to FITSDPX to FITS
All JP2 conversionsAll FITS conversions

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