JPG to JXL Converter

1. Upload one or more JPG files (up to 50 MB total).
2. Click 'Convert to JXL' — finishes in under 3 seconds per image.
3. Download JXL files individually, or grab all as a ZIP.

JXL has a unique lossless transcoding mode: converting a JPG to JXL and back preserves the original JPG bit-for-bit — while shrinking the file by ~20%. A one-way JPG → JXL conversion typically saves 40-60% at the same visual quality.

JPG has been the standard for over 30 years, but JXL is the biggest leap forward since JPG was introduced. JXL files are 40-60% smaller at the same visual quality, with support for HDR, lossless mode, and lossless JPG transcoding. Converting JPG to JXL shrinks your archive dramatically while preparing it for future formats and preserving maximum quality.

The converter decodes the JPG image and re-encodes it as JXL using libjxl. JXL's modular or VarDCT modes produce files 40-60% smaller at the same visual quality. JXL supports progressive decoding, so images load from blurry to sharp. EXIF metadata is preserved.

• Archiving a photo library in the most efficient format available.
• Reducing storage footprint by 40-60% without quality loss.
• Future-proofing image archives against format obsolescence.
• Preparing images for long-term digital preservation.
• Reducing backup size for large JPG archives.
• Converting print masters to a modern efficient format.
• Preparing images for HDR workflows (JXL supports 32-bit float).

JXL output uses lossy compression at 90% visual quality — typically indistinguishable from the source JPG. JXL's unique lossless transcoding mode can preserve the original JPG bit-for-bit while saving ~20%, but that requires decode-on-read at the target. Our default conversion uses lossy mode for maximum size reduction.

• JXL browser support is limited — Chrome removed it in 2023.
• Very old software may not open JXL files.
• Some CMS platforms may reject JXL uploads without plugins.
• Lossy JXL is not a replacement for the original JPG when quality matters.
• JXL is a newer format — adoption is still growing.

• JXL opens in Firefox, Safari (via OS support), and some image viewers.
• Native support in GIMP 2.10+, Krita 5+, and some Adobe apps via plugin.
• Chrome removed JXL support in 2023 — Chrome users need a plugin.
• Windows 11 supports JXL with the free HEIF/JXL extensions.
• Best for archival and storage — not for universal web delivery.

• JXL is the most efficient archival format available today.
• Keep the JPG original if compatibility matters more than size.
• JXL supports lossless transcoding — useful for archival masters.
• Batch-convert up to 50 MB at once.
• EXIF metadata is preserved.

JXL won't open in Chrome

Chrome removed JXL support in 2023. Use Firefox, Safari, or a dedicated image viewer for JXL files.

Some software won't open JXL

Software released before 2022 may not support JXL. Keep the original JPG for broad compatibility.

JXL file is not much smaller than the JPG

If the source JPG was already heavily compressed, JXL cannot compress much further. The 40-60% saving is typical for high-quality sources.

• JPEG XL — Official Specification
• Can I Use — JPEG XL