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HDR File Format

Radiance HDR Image category

HDR (Radiance RGBE) stores floating-point high-dynamic-range pixels — the format of lighting data and HDRI environment maps.

Typical use: Converting HDR to PNG produces a tone-mapped preview usable in any image viewer.

About the HDR format

HDR (Radiance RGBE) is the veteran high-dynamic-range format of lighting research and 3D rendering: pixels stored as a shared 8-bit exponent plus per-channel mantissas, letting one file hold both a sun and a shadow with no clipping. HDRI environment maps for 3D scenes are almost always HDR files.

Standard image viewers show it badly or not at all, because the values can exceed what a screen can display. Converting HDR to PNG tone-maps the file into an 8-bit preview — good for quick inspection, though the floating-point original remains the render-grade master.

Strengths

  • ✓ True high-dynamic-range values
  • ✓ The standard of HDRI environment maps
  • ✓ Compact for its precision

Limitations

  • ✗ Not display-ready — needs tone mapping
  • ✗ Viewer support is scarce
Compression
RGBE (RLE runs)
Transparency
Not supported
Animation
Not supported
Metadata
Radiance comments
Best for
Lighting data, environment maps

Convert HDR to…

48 direct directions plus 12 workflows, sorted A–Z; 🔥 marks popular targets.

HDR to AVIF Hot HDR to BMP Hot HDR to CIN HDR to CUR HDR to DCX HDR to DDS HDR to FARBFELD HDR to FITS HDR to GIF Hot HDR to GRAY HDR to GRAYA HDR to ICO Hot HDR to J2C HDR to J2K HDR to JFIF HDR to JP2 HDR to JPE HDR to JPEG Hot HDR to JPG Hot HDR to JPT HDR to JXL HDR to OTB HDR to PALM HDR to PBM HDR to PCL HDR to PCX HDR to PDF Hot HDR to PFM HDR to PGM HDR to PNG Hot HDR to PNG24 HDR to PNG8 HDR to PNM HDR to PPM HDR to QOI HDR to RAS HDR to SIXEL HDR to SVG Hot HDR to SVGZ HDR to TGA HDR to TIF HDR to TIFF Hot HDR to UYVY HDR to VICAR HDR to WebP Hot HDR to XBM HDR to XPM HDR to XV

Cross-engine workflows

HDR to 7Z HDR to APK HDR to JAR HDR to TAR HDR to TAR.BZ2 HDR to TAR.GZ HDR to TAR.XZ HDR to TBZ2 HDR to TGZ HDR to TXZ HDR to WIM HDR to ZIP

Convert other files to HDR…

AVIF to HDR Hot BMP to HDR Hot CIN to HDR CUR to HDR DCX to HDR DDS to HDR FARBFELD to HDR FITS to HDR GeoTIFF to HDR GIF to HDR Hot GRAY to HDR GRAYA to HDR HEIC to HDR Hot HEIF to HDR ICO to HDR Hot J2C to HDR J2K to HDR JFIF to HDR JP2 to HDR JPE to HDR JPEG to HDR Hot JPG to HDR Hot JPT to HDR JXL to HDR OTB to HDR PALM to HDR PBM to HDR PCL to HDR PCX to HDR PFM to HDR PGM to HDR PNG to HDR Hot PNG24 to HDR PNG8 to HDR PNM to HDR PPM to HDR PSB to HDR PSD to HDR Hot QOI to HDR RAS to HDR RAW to HDR Hot SIXEL to HDR SVG to HDR Hot SVGZ to HDR TGA to HDR TIF to HDR TIFF to HDR Hot UYVY to HDR VICAR to HDR WebP to HDR Hot XBM to HDR XPM to HDR XV to HDR

Frequently asked questions

What is a HDR file?

HDR (Radiance RGBE) stores floating-point high-dynamic-range pixels — the format of lighting data and HDRI environment maps.

How do I convert HDR files online?

Pick a target format from the "Convert HDR to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert HDR files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can HDR convert to?

This page lists all 60 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.