Free Online HDR Image Converter Tools
Convert Radiance HDR to any standard image format. Environment maps and HDRI lighting made shareable.
ToFormat — free online converter
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Max file size: 30MB · Up to 20 files at once
About HDR Converter Tools
ToFormat provides a complete collection of free online HDR converters. Use these tools to convert HDR images to any supported format — or convert any image to HDR — directly in your browser. All converters are fast, secure, and require no registration.
Convert from HDR
Why ToFormat?
HDRI to Standard Format
Radiance HDR files store high dynamic range data for 3D lighting and compositing. Our converter tone-maps the full dynamic range into viewable 8-bit images for web, sharing, and print.
No Software Required
View and convert .hdr files without installing Blender, 3ds Max, or any 3D software. Upload your HDR environment map and get a standard image in seconds.
Batch Processing
Upload up to 20 HDR files at once — perfect for converting HDRI collections or environment map libraries. Choose output format, download in one go.
Fast & Secure
Instant server-side conversion with automatic file deletion within 10 minutes. No registration, no watermarks, no data collection.
About Radiance HDR Format
Radiance HDR (.hdr, also known as RGBE) is a high dynamic range image format created by Greg Ward for the Radiance lighting simulation system in the late 1980s. It was one of the first formats designed to store the full range of real-world light intensities — from dim shadows to direct sunlight — in a single image file.
HDR uses a compact RGBE encoding (Red, Green, Blue, Exponent) that stores floating-point light data with run-length encoding compression. This allows HDR files to capture a dynamic range of over 76 orders of magnitude while remaining relatively compact compared to uncompressed float formats like EXR.
The primary use of Radiance HDR today is as HDRI environment maps for 3D rendering and image-based lighting (IBL). Artists use HDR panoramas to light 3D scenes with realistic reflections and ambient illumination. HDR files cannot be viewed in browsers or standard image viewers — conversion to standard formats requires tone mapping.
When to Convert From HDR
For sharing and preview — HDR files cannot be opened in standard image viewers or browsers. Convert HDR to JPG for quick shareable previews of environment maps, or HDR to PNG for lossless stills with higher quality.
For web publishing — showcase your HDRI work online by converting HDR to WebP or HDR to AVIF. AVIF is particularly well-suited as it supports HDR tone mapping and wide color gamut on compatible displays.
For print and portfolio — convert HDR to TIFF for maximum quality in print workflows. TIFF at 16-bit preserves significantly more tonal detail from the original HDR data than 8-bit formats.
For thumbnails and catalogs — when building an HDRI library preview page, convert HDR to JPG for lightweight thumbnail images that load quickly in file browsers or web galleries.
HDR Conversion: What to Expect
Radiance HDR stores light intensities far exceeding what standard monitors can display. Converting to standard formats requires tone mapping — intelligently compressing the wide dynamic range into the 0–255 range of 8-bit displays. Very bright areas may be clipped and deep shadow detail compressed.
Equirectangular HDR panoramas are converted as flat rectangular images — the full 360° panorama is preserved as a 2:1 aspect ratio image. You can use the converted image as a preview or reference, though the HDR lighting data is lost in standard formats.
For the best quality, convert HDR to TIFF at 16-bit or HDR to AVIF with HDR support. For universal sharing, JPG and PNG work on every device. See all options in our complete converter catalog.