JXL WinThumb is a free, open-source JPEG XL decoder by saschanaz that plugs into Windows, so .jxl files show real thumbnails in File Explorer and open in Paint and Microsoft Photos on PCs too old for the JPEG XL Image Extension.

JXL-Winthumb screenshots

See the JXL-Winthumb interface full size before you install it.

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How to Download JXL-Winthumb

Pick your file - the one marked Recommended fits your device.
Use a Mirror first - US and EU mirrors are our own servers and usually the fastest.
Run the installer and follow the steps. Not starting? Try another server or a different browser.

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