JPEG XL Image Converter
Convert images to and from JPEG XL (.jxl) right in your browser. Supports JPG, PNG, APNG, GIF, WebP, AVIF, and batch ZIP archives with lossless JPEG transcoding.
Drop JPG, PNG, GIF, WebP, AVIF, JXL, or .ZIP archives here
Batch processing supported • Drag & drop files, paste from clipboard (Ctrl+V), or browse
Conversion Settings
75–85 matches visually lossless JPEG
1 = Fast (Lightning) • 7 = Default (Squirrel)
Dedicated JPEG XL Format Converters
Choose a specialized tool for converting to or from JPEG XL (.jxl)
Convert Images to JXL
Convert JXL to Other Formats
Why Convert Images with JPEGXL.app?
JPEG XL (ISO/IEC 18181) is the next-generation royalty-free image format engineered to replace legacy JPEG, PNG, GIF, and WebP. With up to 60% smaller file sizes at identical perceptual quality, lossless JPEG bitstream recompression, HDR, alpha transparency, and multi-frame animation, JPEG XL delivers unmatched versatility.
100% Local Privacy
Powered by WebAssembly (`libjxl`). Your images are processed inside your browser tab and never uploaded to any cloud server.
Reversible JPEG Recompression
Losslessly transcode existing `.jpg` files into `.jxl` (~20% smaller) and reconstruct the exact bit-for-bit `.jpg` whenever needed.
Batch & ZIP Archive Workflow
Drop dozens of images or a `.zip` archive at once. Download converted files individually or bundled in a single `.zip`.
Animation & Alpha Support
Full support for multi-frame animations and alpha transparency across JXL, APNG, GIF, WebP, and AVIF.
Format Capabilities Matrix
| Format | Lossless | Alpha | Anim |
|---|---|---|---|
| JPEG XL | Yes + JPG | Yes | Yes |
| AVIF | Yes | Yes | Yes |
| WebP | Yes | Yes | Yes |
| PNG / APNG | Only | Yes | APNG |
| JPG | No | No | No |
| GIF | 256-col | 1-bit | Yes |
Powered by libjxl (v0.7 WebAssembly) and client-side WebCodecs/WASM image pipelines.
Frequently Asked Questions
Are my images uploaded to any server?
No. All image decoding and encoding runs 100% locally inside your web browser using WebAssembly (libjxl cjxl/djxl). Your photos and graphics never leave your device.
How does lossless JPEG to JXL recompression work?
Unlike standard format conversions that decode pixels and re-compress them with generation loss, JPEG XL can losslessly transcode existing JPEG DCT coefficients into a JXL bitstream—shrinking file size by ~20% while allowing bit-for-bit reconstruction back to the exact original JPG.
Can I upload a ZIP archive or convert multiple files at once?
Yes! Drag and drop dozens of images or a .zip archive directly into the converter. You can download converted images individually or grab all results in a single ZIP click.
Does JPEG XL support animation and transparency?
Yes. JPEG XL natively supports alpha channels, 16-bit/32-bit HDR color depths, and multi-frame animations converted from GIF, APNG, WebP, or AVIF.