Free online HDR to WEBP converter

HDR images are often produced by 3D renderers and panorama tools, while browsers and web applications commonly require WEBP for smaller image files. Converting the image also makes it easier to share, embed, or edit, but the HDR brightness range may need tone mapping before WEBP export.

What the HDR format is

The common .hdr image format is Radiance RGBE, a floating-point-style format used to store high-dynamic-range lighting data. It appears in HDR environment maps, architectural visualizations, 3D renders, exposure-bracketed photographs, and lighting simulations.

Applications such as Blender, Autodesk 3ds Max, Cinema 4D, Adobe Photoshop, Radiance, and panorama software can create or open HDR files. The format can contain brightness values beyond the range that a normal monitor or standard 8-bit image can display.

What the WEBP format is

WEBP is a web image format supported by current versions of major browsers and many image editors. It supports lossy and lossless compression, transparency, and 8-bit RGB or RGBA image data.

WEBP usually produces smaller files than JPEG or PNG at comparable visual quality, making it suitable for websites, messaging, previews, and storage where broad browser support and reduced size matter. It is not a full replacement for HDR because standard WEBP does not preserve the source file's complete floating-point dynamic range.

How to convert HDR to WEBP

Using ImageMagick

ImageMagick is suitable for direct conversion of Radiance HDR files. Install it from the official ImageMagick distribution, then run:

magick input.hdr -colorspace sRGB -clamp -depth 8 -quality 85 output.webp

Replace input.hdr and output.webp with the actual filenames. The command converts linear HDR values to the sRGB color space, clips values outside the displayable range, reduces the result to 8-bit channels, and writes lossy WEBP at quality 85.

For lossless WEBP, use:

magick input.hdr -colorspace sRGB -clamp -depth 8 -define webp:lossless=true output.webp

For a graphical workflow, open the file in an HDR-capable editor, apply its tone-mapping or exposure controls, then choose File → Export or File → Save As and select WEBP. Set the color profile to sRGB before exporting for consistent browser display.

Using the online converter

You can convert the file for free on the 101convert.com website without installing software: upload the HDR file, choose WEBP as the output format, start the conversion, and download the resulting file.

Quality and compatibility limitations

A direct conversion can clip bright areas or produce a dark, flat image because WEBP cannot retain all HDR luminance values. If highlights disappear, adjust exposure and tone mapping in an HDR-aware editor before exporting rather than increasing WEBP quality.

Lossy WEBP quality between 80 and 90 is a practical starting range for web images; use lossless mode when pixel accuracy matters. Check the exported file in the target browser or application because older software may not support WEBP, and retain the original HDR file if further exposure or lighting adjustments may be required.