WEBP to JXL Converter

1. Upload one or more WebP 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 typically produces files 30-40% smaller than WebP at the same visual quality. Both are modern formats, but JXL has additional features like HDR support, lossless mode, and progressive decoding.

WebP is the standard for modern web images — 25-35% smaller than JPG and supported by every browser since 2020. But JXL is even more efficient: 30-40% smaller than WebP at the same visual quality. JXL also supports HDR, lossless mode, and progressive decoding. Converting WebP to JXL gives you the smallest possible files for archival, storage optimization, or future-proofing.

The converter decodes the WebP image and re-encodes it as JXL using libjxl. JXL's compression is more efficient than WebP's VP8, producing files 30-40% smaller at the same quality. WebP's alpha channel is preserved as JXL's alpha.

• Archiving a WebP image library in the most efficient format.
• Reducing storage by another 30-40% beyond WebP.
• Future-proofing images for next-generation formats.
• Preparing images for HDR workflows.
• Consolidating a mixed WebP library into a single efficient format.
• Reducing backup size for large WebP archives.
• Preparing images for long-term digital preservation.

JXL output uses lossy compression at 90% visual quality — indistinguishable from the source WebP at normal viewing distances. JXL's compression is 30-40% more efficient than WebP, so the output is significantly smaller. Transparency is preserved. JXL also supports lossless mode for mathematically perfect conversions.

• 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.
• JXL is a newer format — adoption is still growing.
• Not suitable for universal web delivery (like WebP is).

• JXL opens in Firefox, Safari (via OS support), and some image viewers.
• Native support in GIMP 2.10+, Krita 5+, and Adobe via plugin.
• Chrome removed JXL support in 2023.
• Windows 11 supports JXL with the free extensions.
• Best for archival and storage optimization.

• JXL is the most efficient mainstream image format available.
• Keep the WebP if you need browser compatibility.
• JXL supports lossless mode — useful for archival masters.
• Batch-convert up to 50 MB at once.
• WebP transparency is preserved in the JXL output.

JXL won't open in Chrome

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

JXL is not much smaller than the WebP

If the source WebP was already heavily compressed, JXL cannot compress much further. The 30-40% saving is typical for high-quality sources.

Some software won't open JXL

Software released before 2022 may not support JXL. Keep the WebP if legacy compatibility is needed.

• JPEG XL — Official Specification
• Google Developers — WebP
• Can I Use — JPEG XL