No. Everything runs in this browser tab on your own device. Engines are downloaded once and cached, but your files never leave your computer.

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Image / HDR & EXR Viewer

HDR & EXR Viewer

Open OpenEXR and Radiance HDR images, adjust exposure and tone-map them to PNG, JPG, WEBP or AVIF.

Free, no uploads, no sign-up. Runs 100% in your browser.

How HDR & EXR Viewer works

Files are decoded to 32-bit floating point with the three.js EXR and HDR loaders. Exposure and an ACES, Reinhard, filmic or clip tone curve map the high dynamic range to standard sRGB, entirely on your CPU.

Input: EXR, HDR, PIC. Output: PNG, JPG, WEBP, AVIF.

How to use HDR & EXR Viewer

Drop an EXR or HDR file.
Adjust exposure (an automatic starting value is picked for you).
Choose a tone-mapping curve.
Download as PNG, JPG, WEBP or AVIF.

Tips

Hover over the image to read the raw float values of a pixel.
ACES gives a natural film-like look for HDRI skies.

HDR & EXR Viewer FAQ

Is my file uploaded?: No. Everything runs in this browser tab on your own device. Engines are downloaded once and cached, but your files never leave your computer.
Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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