CONVERT
HDR → BMP
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Fast, secure HDR to BMP conversion. No registration required.
Here is the short version — HDR is a raster image format with its own balance of compression, colour depth, and software support. Hence the need for BMP. If you have ended up with a HDR and need a BMP, the mismatch is almost always about where the image is going next rather than the picture itself. Our server reads the HDR with ImageMagick, decodes each pixel, and re-writes it as a BMP using defaults tuned for fidelity first and file size second. Worth knowing: HDR is a raster image format with its own balance of compression, colour depth, and software support. Meanwhile BMP is the uncompressed Windows bitmap format — bulky but pixel-perfect.
Radiance HDR Image
Source formatHDR (Radiance) stores high dynamic range images for realistic lighting in 3D rendering.
BMP Image
Target formatBMP is an uncompressed raster image format native to Windows. Files are large but preserve exact pixel data with no compression artifacts. Rarely used on the web due to file size.
Why convert HDR to BMP
Both HDR and BMP describe a grid of pixels — the difference lies in how that grid is compressed, whether transparency is supported, and which software opens it natively. Moving from HDR to BMP is worth it when the BMP ecosystem is broader for your use case, or when BMP compresses photographs more efficiently than HDR.
HOW TO CONVERT
HDR → BMP
Drop the HDR file
Drag and drop or click to upload your HDR. The image is transferred securely over HTTPS and queued for conversion.
Re-encode with ImageMagick
ImageMagick decodes every pixel of the HDR and writes a matching BMP with sensible default quality settings.
Download the BMP
The converted BMP is ready to download as a single file; both files delete automatically within two hours.
Common Use Cases
Share across platforms
Send BMP files to anyone without worrying about whether they have the right software for HDR.
Embed in documents
Drop BMP output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
BMP often produces smaller files than HDR for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
HDR vs BMP — Strengths and limitations
What each format does best, and where it falls short.
HDR Strengths
- True floating-point dynamic range in 32 bits per pixel.
- Simple format — easy to parse and generate.
- Standard for environment maps and lighting probes in 3D.
- 30+ years of continuous use in architectural rendering.
Limitations
- No compression — files are larger than OpenEXR or AVIF for equivalent quality.
- Only one channel set (RGB) — no alpha, no multi-layer like EXR.
- Not a web format.
BMP Strengths
- Dead-simple format — trivially easy to read and write.
- Lossless and uncompressed — perfect bit-exact pixel storage.
- Universally supported in Windows applications since 1985.
- Supports 1, 4, 8, 16, 24, and 32-bit color depths.
Limitations
- Enormous file sizes — no meaningful compression in typical use.
- Not a web format — browsers support it but nobody serves BMPs over HTTP.
- No metadata support (no EXIF, no ICC profile in practice).
HDR vs BMP — Technical specifications
Side-by-side comparison of the technical details.
HDR
- MIME type
- image/vnd.radiance
- Extensions
- .hdr, .pic
- Encoding
- RGBE (shared 8-bit exponent)
- Dynamic range
- ~76 orders of magnitude
- Creator
- Greg Ward, Radiance renderer (1991)
BMP
- MIME type
- image/bmp
- Extensions
- .bmp, .dib
- Compression
- None (typical); RLE 4/8 bit (rare)
- Color depths
- 1, 4, 8, 16, 24, 32 bits per pixel
- Byte order
- Little-endian
| Specification | HDR | BMP |
|---|---|---|
| MIME type | image/vnd.radiance | image/bmp |
| Extensions | .hdr, .pic | .bmp, .dib |
| Encoding | RGBE (shared 8-bit exponent) | — |
| Dynamic range | ~76 orders of magnitude | — |
| Creator | Greg Ward, Radiance renderer (1991) | — |
| Compression | — | None (typical); RLE 4/8 bit (rare) |
| Color depths | — | 1, 4, 8, 16, 24, 32 bits per pixel |
| Byte order | — | Little-endian |
HDR vs BMP — Typical file sizes
Approximate file sizes for common scenarios.
HDR
- 2K environment map 15-35 MB
- 4K environment map 60-130 MB
- 8K HDRI 250-500 MB
BMP
- Small icon (32×32) 4 KB
- Screenshot (1920×1080) ~6 MB
- 4K image (3840×2160) ~25 MB
- Scanned A4 at 300 dpi ~25 MB
Quality & Compatibility
If BMP is a lossless format (PNG, TIFF, BMP) the output keeps every pixel of the decoded HDR exactly. If BMP is a lossy codec (JPEG, WebP, HEIC), the encoder re-compresses the image at the quality level you select — default 85 is transparent for photographs, quality 92+ for illustrations with hard edges.
Tips for Best Results
- Keep the original HDR alongside the BMP output — re-encoding already-lossy images accumulates detail loss on each round.
- If the BMP will be uploaded to a CMS, check whether the platform has a max dimension and downscale once on export rather than letting the CMS resize automatically.
- For thumbnails and avatars, export the BMP at exactly the display size; browsers will otherwise resample and the image may look soft.
Frequently Asked Questions
It depends on the codecs involved. If both HDR and BMP are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If BMP is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded HDR exactly, but cannot recover detail that HDR had already compressed away.
Often yes, especially when BMP is lossless. HDR tuned for efficient web delivery will usually produce smaller files than BMP's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
BMP Bitmap Format: The Complete Technical Guide
Everything about the BMP format: DIB header variants, pixel storage, color depths (1 to 32-bit), RLE compression, alpha channels, and BMP vs PNG vs TIFF.
Read guideBMP Format: Windows Bitmap Images Explained — Headers, Compression & Use Cases
Learn what BMP files are, how the Windows Device Independent Bitmap format works, supported colour depths, compression options, and when to use BMP vs PNG.
Read guideOpenEXR: High Dynamic Range & 16-Bit Float HDR Imaging
Complete guide to OpenEXR: 16-bit float color depth, HDR imaging, alpha channels, multi-layer compositing, and professional VFX workflows.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.