Convert J2K to JXL

If you're looking for a reliable and efficient software tool to convert your J2K files to JXL format with ease, you can count on reaConverter.

As a comprehensive offline conversion tool, reaConverter facilitates batch processing of files between formats, including engineering drawing conversion from J2K to JXL, while offering supplementary image manipulation features.

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. At the same time, it will allow you to apply image editing options during conversion.

Install reaConverter

2. Load your J2K files

Start reaConverter and load all the .j2k files you intend to convert into .jxl. The software supports multiple J2K conversion and processes all files locally on your computer.

Select J2Ks from a folder or by drag-and-dropping them directly into the reaConverter window.

3. Select JXL as output format

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

4. Start J2K to JXL conversion

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

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

J2K to JXL offline

reaConverter offers the fastest, simplest solution for converting your J2K files into JXL in seconds - all images processed on your PC for maximum privacy and speed.

Download Free Trial

Do more with your images

Converting J2K 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.

Image editing tools

User Reviews

Average User Rating:
Last updated on April 23, 2025

"reaConverter’s Watch Folders feature has transformed my workflow! I set it to automatically convert my images to JXL, and now every new file I add gets optimized instantly. JXL keeps my photos crisp at half the file size of JPEGs. Super easy setup, flawless results – a must for batch processing!"

Alex R.

Photographer

"Switching to JXL format with reaConverter was effortless. The compression is incredible - my images look perfect at half the file size of JPEGs. The batch conversion works flawlessly, saving me storage space without sacrificing quality. JXL is clearly the future, and reaConverter makes adoption painless!"

Mark T.

Satisfied Customer

"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

"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

Happy User

J2K to JXL Conversion: FAQ

Can reaConverter convert J2K to JXL?

Yes! reaConverter instantly converts .j2k to .jxl 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 J2K to JXL online?

If you only need to convert a few J2K files to JXL format, feel free to try our free online free online J2K to JXL converter — perfect for small batches with no installation needed!

How can I turn J2K files into JXL on my computer?

The best way to change J2Ks to JXLs 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 J2K to JXL.

How can I automate J2K to JXL 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 J2K files to JXL using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line j2k to jxl converter for batch processing.

What else can I do with reaConverter?

Convert vector files Convert picture color space Change file date Copy IPTC data Change format settings