CONVERT HDR → PNG (HDR to PNG)
Fast, secure HDR to PNG conversion. No registration required.
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Automatic format identification and lossless transcoding across 201+ formats.
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Device Serial & Lens ID: Stripped (EXIF / IPTC / XMP Clean)
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Color Space Profile: Display P3 → sRGB IEC61966-2.1
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Chroma Subsampling: 4:4:4 High Fidelity (High-fidelity algorithmic conversion)
HOW TO CONVERT HDR → PNG
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 PNG with sensible default quality settings.
Download the PNG
The converted PNG is ready to download as a single file; both files delete automatically within two hours.
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 PNG. If you have ended up with a HDR and need a PNG, 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 PNG using defaults tuned for fidelity first and file size second. Technical note: HDR is a raster image format with its own balance of compression, colour depth, and software support. Compare that with PNG is the lossless image standard with alpha-channel transparency and deflate compression.
Why convert HDR to PNG
Both HDR and PNG 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 PNG is worth it when the PNG ecosystem is broader for your use case, or when PNG compresses photographs more efficiently than HDR.
HDR vs PNG — 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)
PNG
- MIME type
- image/png
- Compression
- Lossless — DEFLATE (zlib)
- Color depth
- 1, 2, 4, 8 or 16 bits per channel
- Max dimensions
- 2^31 − 1 pixels per side (2.1 billion)
- Transparency
- Full 8-bit alpha channel
- Standard
- ISO/IEC 15948:2004
| Specification | HDR | PNG |
|---|---|---|
| MIME type | image/vnd.radiance | image/png |
| Extensions | .hdr, .pic | — |
| Encoding | RGBE (shared 8-bit exponent) | — |
| Dynamic range | ~76 orders of magnitude | — |
| Creator | Greg Ward, Radiance renderer (1991) | — |
| Compression | — | Lossless — DEFLATE (zlib) |
| Color depth | — | 1, 2, 4, 8 or 16 bits per channel |
| Max dimensions | — | 2^31 − 1 pixels per side (2.1 billion) |
| Transparency | — | Full 8-bit alpha channel |
| Standard | — | ISO/IEC 15948:2004 |
HDR vs PNG — 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.
PNG Strengths
- Lossless compression — every save preserves the original pixels perfectly.
- Full 8-bit alpha channel for smooth transparency.
- Excellent for text, UI screenshots, logos, and line art.
- Royalty-free and an ISO standard (ISO/IEC 15948).
- Supports 16-bit color depth for high-fidelity work.
Limitations
- Much larger than JPEG for photographs (no perceptual compression).
- No native animation in most software (APNG support is inconsistent).
- No CMYK support — web and screen only, not print.
Quality & Compatibility
If PNG is a lossless format (PNG, TIFF, BMP) the output keeps every pixel of the decoded HDR exactly. If PNG 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 PNG output — re-encoding already-lossy images accumulates detail loss on each round.
- If the PNG 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 PNG 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 PNG are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If PNG 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 PNG is lossless. HDR tuned for efficient web delivery will usually produce smaller files than PNG'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.
Radiance HDR Image
Source formatHDR (Radiance) stores high dynamic range images for realistic lighting in 3D rendering.
PNG Image
Target formatPNG is a lossless image format that supports transparency. It is ideal for graphics, logos, screenshots, and any image where preserving exact pixel data is important.
Common Use Cases
Share across platforms
Send PNG files to anyone without worrying about whether they have the right software for HDR.
Embed in documents
Drop PNG output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
PNG 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 PNG — Typical file sizes
Approximate file sizes for common scenarios.
- 2K environment map 15-35 MB
- 4K environment map 60-130 MB
- 8K HDRI 250-500 MB
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
OpenEXR: 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 guide →PNG: Advanced Color Modes, Filtering & Compression Strategies
Comprehensive guide to PNG encoding: color types (indexed, grayscale, RGB, RGBA), scanline filtering (Sub/Up/Average/Paeth), CRC checksums, gamma correction, ICC color profiles, interlacing methods.
Read guide →PNG Format: Complete Technical Guide to Lossless Image Compression, Transparency & Interlacing
Learn PNG (Portable Network Graphics): IHDR structure, color types, IDAT chunks, PLTE palette, bit depths, interlacing, compression, color profiles.
Read guide →
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