Convert WebP to JPEG XL
WebP is already the leanest format most sites use — but JPEG XL can usually shave another 10–30% off at the same look, and it brings true-lossless and animation along with it. Maintaining an image library or rebuilding a site's assets? Batch-converting WebP to .jxl is a tidy way to cut storage once browsers finish adopting JXL. A note on sources: most WebP on the web was lossy-encoded, so this defaults to a quality-guided pass (75% slider) that keeps the look while slimming the file — flip Lossless on only when your source WebP was exported lossless. Re-wrapping an already-crushed WebP can't bring back lost detail, so for heavily compressed sources the smarter move may be the original image, not this.
Drop WebP files here or click to browse
Processed locally — files never leave your device
How to use
- Drop your WebP files into the box, or click it to browse.
- Leave Lossless off for typical web WebP (quality slider guides the size), or turn it on for lossless sources.
- Encoding runs locally in your browser via WebAssembly.
- Download the converted .jxl images.
Frequently asked questions
How much smaller will .jxl be than WebP?
At the same visual quality, typically 10–30% smaller. The savings depend on content: smooth gradients and screenshots compress well; already-heavily-compressed sources have little left to gain.
Is my WebP uploaded anywhere?
No. WebP decoding uses your browser's native support and JPEG XL encoding runs as WebAssembly in your tab. Nothing is transmitted or stored, and it works offline.
Is my WebP lossy or lossless?
WebP supports both. Most images downloaded from the web are lossy; sources exported from design tools are often lossless. If you don't know, leave Lossless off and use the quality slider — for lossless sources, turning it on guarantees no further loss.
When is converting WebP to JXL a bad idea?
When the WebP was already compressed heavily — re-encoding adds another lossy generation without recovering detail. And anywhere the destination (social platform, email, legacy app) doesn't read .jxl yet, keep WebP.
Can browsers display JPEG XL?
Safari has rendered .jxl still images since version 17 (2023); Chrome enables them by default from version 155 (October 2026) and Firefox from version 158 (October 2026). As all three engines converge, .jxl becomes the natural next step after WebP — while most apps and platforms still need an encoded output, which is what converting for them is all about.
Does the alpha channel survive?
Yes. Both lossless and quality modes preserve transparency. Transparent WebP logos and overlays convert correctly.
What's the difference from PNG→JXL?
PNG sources are clean and lossless, so PNG to JXL shines in true-lossless mode. WebP sources were usually lossy to begin with, so quality-guided conversion is often the sensible default.
Related tools
Convert from JPEG XL back to JXL to WebP or JXL to JPG. Starting from PNG or JPG instead? See PNG to JXL and JPG to JXL.