How to convert HDR to EXR
- Add your .HDR file - drop it in the box above or click to browse.
- Convert it to .EXR in a few seconds.
- Download your new .EXR file.
What to expect
- No dynamic range is lost - RGBE values unpack exactly to float, and EXR stores them with equal or greater precision.
- Expect the output
.exrto be 2-4× larger than the source.hdr, since EXR uses 12 bytes per pixel vs. 4 in RGBE. - Avoid generic photo converters - they tone-map the HDR to 8-bit before writing the
.exr, producing a degraded result.
Frequently asked questions
Is converting HDR to EXR lossless?
Yes. Both formats are high dynamic range, so no values are clipped or tone-mapped. The RGBE data unpacks cleanly into EXR's floating-point channels.
Why is the resulting .exr file so much larger?
EXR stores 12 bytes per pixel (3 channels × 4 bytes at 32-bit float) versus 4 bytes in RGBE, so even with ZIP compression the file is typically 2-4× bigger.
Do I need to convert if I am only using the map in Blender?
No - Blender reads
.hdr natively for HDRI lighting. Convert to .exr only if you need to pass the file to a compositing pipeline that requires it.Can I batch-convert a folder of HDR files?
Yes -
oiiotool handles batch conversion on the command line, and both Blender and Krita support scripted batch export via Python.
