JXR is legacy and read-only here
JXR (JPEG XR) is a Microsoft high-dynamic-range format with little support outside Windows. It can usually be opened and converted from, but it's long obsolete, so there's no modern encoder to create new JXR files.
Looking to convert HDR to JXR? Here's the honest answer — and what works instead.
Turn your file into a share-worthy AI Effect — one tap, no prompts.
HDR (Radiance) stores high-dynamic-range lighting data, common for environment maps and 3D lighting.
HDR opens in Photoshop, Blender and HDR-capable viewers.
JXR (JPEG XR) is a high-dynamic-range format with better compression than JPEG, used in some Windows and HDR workflows.
JXR opens in Windows Photo Viewer; convert to JPG/PNG for universal use.
Not here — JXR is a legacy format with no modern encoder. We can often read JXR as a source, but for output use a current format like PNG, JPG or TIFF.
HDR converts to PNG, JPG or TIFF — free, no sign-up, no watermark.