Free online JPG to JXL converter

Source format: jpg

JPG (or JPEG) is one of the most widely used raster image formats for photos and web images. It uses lossy compression, which keeps files relatively small by discarding some image data. JPG is supported by nearly every device, browser, editor, and operating system, which is why it remains a common choice for camera photos, email attachments, and social media uploads.

Its main strengths are broad compatibility and efficient compression. Its main drawback is that repeated saving can gradually reduce image quality.

Target format: jxl

JXL is the file extension for JPEG XL, a modern image format designed to improve on older formats like JPG. It supports lossy and lossless compression, high dynamic range, wide color gamut, alpha transparency, and progressive decoding. JPEG XL is intended for high-quality image storage, web delivery, and archival use where smaller files and better fidelity are important.

Compared with JPG, JXL can often deliver better compression efficiency at similar visual quality. It can also preserve quality more effectively during re-encoding. However, compatibility is still not as universal as JPG, so it is important to check whether your target apps and devices can open .jxl files.

How to convert jpg to jxl

The best method depends on whether you want a quick one-off conversion or batch processing. For many users, a desktop tool with JPEG XL support is the most practical choice. You can also convert the file on 101convert.com for free, without installing any software.

Option 1: Use a desktop editor or converter

1. Open the JPG file in software that supports JPEG XL export, such as Krita, GIMP with JPEG XL support, or another converter that can write .jxl files.
2. Choose File → Export As or File → Save As.
3. Select JPEG XL or .jxl as the output format.
4. Adjust quality settings if available. For photographs, a high-quality lossy setting is often appropriate; for exact preservation of the decoded image data, choose lossless if supported.
5. Save the file with the .jxl extension.

Option 2: Use command-line tools

If you work with many images, command-line tools are efficient. A common approach is to use libjxl utilities such as cjxl for encoding.

1. Install a JPEG XL encoder package that includes cjxl.
2. Run a command such as cjxl input.jpg output.jxl.
3. Optionally add quality settings, for example cjxl input.jpg output.jxl -q 90 for high-quality lossy output.
4. Verify the result by opening the .jxl file in a compatible viewer.

Option 3: Batch conversion

For multiple JPG files, use a script or batch file with cjxl to process an entire folder. This is useful for photo archives, web asset preparation, or comparing JPEG XL compression against existing JPG collections.

Notes on quality, compatibility, and limitations

Converting JPG to JXL does not restore lost detail. Because JPG is already lossy, the new JXL file can preserve the current image more efficiently, but it cannot recover information that was removed when the JPG was created.

In many cases, JXL can produce a smaller file than JPG at similar visual quality, or better quality at a similar size. Results vary depending on the image content and encoder settings.

Compatibility is the main limitation. JPG is universally supported, while JXL support is still growing and may be missing in some browsers, apps, operating systems, and older devices. If you need maximum compatibility, keep the original JPG as well.

If the source JPG contains metadata such as EXIF, color profiles, or orientation tags, check whether your chosen tool preserves them during conversion. For photography workflows, preserving metadata and color management is often important.