Convert B&W to JXL

Why upload sensitive B&W files to online converters? reaConverter processes everything locally — convert to JXL with zero cloud risk.

Need to convert B&W to JXL? 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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B&W to JXL
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How to Convert Multiple B&W Files to JXL?

1. Download and Install reaConverter

reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately.

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Install reaConverter

2. Load your B&W files

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

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

Load your B&W files into reaConverter

3. Select JXL as output format

Set JXL as output format and select where to save your converted files. Customize quality settings if needed.

Select JXL as output format

4. Start B&W to JXL conversion

Press Convert to begin processing. You can watch the progress or minimize and let it run in the background.

Start Conversion

Your converted JXL files will appear in the destination folder as soon as processing completes.

B&W to JXL Converter

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

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Do more with your files

Converting B&W 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 January 25, 2026
"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.
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.
Mark T.
Satisfied Customer
"An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!"
Logan B.
Logan B.
Satisfied Customer
"I use the online converter — it’s quick and hassle-free!"
Jian Wong
Jian Wong
Happy Online User
"Working in a print studio means constantly juggling obscure file formats. I used to waste hours Googling converters or installing random software — until reaConverter became my Swiss Army knife. Install it once, and you're set forever. No internet? No problem!"
Helen Evans
Helen Evans
Satisfied Customer
"Creating marketing materials for various platforms requires multiple file versions from single sources. reaConverter's workflow automation lets us generate PNG, JPEG, and SVG variants from AI and PSD files simultaneously. The color profile management ensures brand consistency across all outputs, and the processing speed allows for last-minute changes without delaying deadlines."
Rebecca Turner
Rebecca Turner
Marketing Agency CEO

B&W to JXL Conversion: FAQ

What are B&W files?

B&W is a black-and-white image file created with Image Lab, an image analysis software program used in several scientific domains. Image Lab allows the creation, processing and editing of colour and grayscale images, and includes a wide variety of functions. B&W is considered a rare format and can be converted to more accessible extensions for easier storing and transferring.

What are JXL files?

JPEG XL JXL is a modern image compression format designed to replace older formats like JPEG, PNG, and even WebP. It aims to provide superior image quality at smaller file sizes while supporting advanced features for both web and professional use.

Can reaConverter convert B&W to JXL?

Yes! reaConverter instantly converts .b&w 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.

Can I convert B&W to JXL online?

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

How can I turn B&W files into JXL on my computer?

The best way to change B&Ws 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 B&W to JXL.

How can I automate B&W 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 B&W 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 b&w to jxl converter for batch processing.

What else can I do with reaConverter?

Convert DICOM filesResize pictureConvert PDF filesWatermark imagesConvert Gerber files

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