How to use it
- Add your files. Drop JPG files on the page or use Choose files. Folders and ZIPs work too.
- Check that JXL is selected. JXL is already chosen on this page.
- Adjust options if you need to. Quality, size and other settings appear when the format has them.
- Convert and download. Press Convert; with several files, “Download all” gives you one ZIP.
What happens to your file
The picture is decoded in your browser and saved as JXL at the quality you choose. Transparent areas are kept.
About JPG and JXL
JPG: JPG (JPEG) is the standard photo format, small and supported everywhere.
JXL: JPEG XL (.jxl) is a new image format that compresses better than JPG and can repack JPGs losslessly.
Questions
Is my JPG file uploaded?
No. The conversion runs inside this browser tab, and the JXL is created on your device. Nothing is sent to a server.
Can I convert several JPG files at once?
Yes. Drop as many as you like, a folder or a ZIP; “Download all” saves every JXL in one ZIP.