PNG Won't Open? Convert to HDR Instantly
Fast, instant PNG to HDR conversion. No signup required. Just drop your .png file and get .hdr in seconds.
Batch Settings
Transparency will be lost
PNG supports transparency, but HDR does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead.
Some metadata may not survive
Your PNG file may contain tEXt, iTXt, ICC metadata. HDR has limited or no support for these metadata types. Location data (GPS), camera settings, and color profiles may be stripped during conversion.
Color depth reduction: 48-bit → 32-bit
PNG stores up to 48 bits per channel, but HDR supports only 32 bits. You may notice banding in smooth gradients (like sky or skin tones) where subtle color transitions are lost.
About PNG to HDR Conversion
Dealing with a PNG file that won't open on your device? You're not alone — PNG compatibility issues are one of the most common reasons people search for a file converter. PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots.
The fix is simple: convert your PNG to HDR. HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Full Name: PNG uses Portable Network Graphics, while HDR uses Radiance HDR Image. Compression: PNG uses Lossless, while HDR uses Lossless. Transparency: PNG uses Yes, while HDR uses No. PNG supports transparency, but HDR does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead.
CocoConvert processes your PNG file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you specifically need a HDR file for your workflow. Common misconception: ""My file's transparent background will carry over to HDR"" — in reality, hdr doesn't support transparency. transparent areas become solid (usually white). save as png or webp if you need transparency.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert PNG to HDR
- 1
Add your PNG file
Drag and drop your .png file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick HDR output
Select .hdr as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The image engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .hdr file. For batch jobs, download all at once as a zip.
What Happens When You Convert PNG to HDR
Your PNG image is decoded into raw pixel data, then re-encoded as HDR. No quality loss — pixel data is preserved exactly.
Your PNG file is decoded — the compressed/stored pixel data is expanded into raw RGBA (with alpha channel) pixels
Transparency is resolved: transparent pixels are composited onto a white background
Pixels are re-encoded using Radiance HDR Image's lossless compression
Metadata (EXIF, ICC profiles) is transferred where HDR supports it
The HDR file is saved and ready for download
PNG vs HDR — Detailed Comparison
| Feature | .PNG | .HDR |
|---|---|---|
| Full Name | Portable Network Graphics | Radiance HDR Image |
| Compression | Lossless | Lossless |
| Transparency | Yes | No |
| Animation | No | No |
| Color Depth | 8 or 16 bits/channel (up to 48-bit color) | 32-bit float (RGBE encoding) |
| HDR Support | No | Yes |
| Typical File Size | 5–20 MB per photo, <1 MB for graphics | 5–50 MB |
| Platform Support | Universal | Very Limited |
| Browser Support | Universal | none |
| Year Created | 1996 | 1985 |
| Open Standard | Yes | Yes |
Should You Convert PNG to HDR?
When to Convert
- ✓When you specifically need a HDR file for your workflow
When NOT to Convert
- ✗You need to preserve transparent areas — HDR doesn't support transparency
Consider alternatives:
Common Mistakes When Converting PNG to HDR
"My file's transparent background will carry over to HDR"
HDR doesn't support transparency. Transparent areas become solid (usually white). Save as PNG or WebP if you need transparency.
Frequently Asked Questions
Why won't my PNG file open?
PNG files may not open if your device lacks the right codec or application. Converting to HDR — a more widely supported format — usually resolves this. HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering.
Is it safe to convert PNG to HDR online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting PNG to HDR?
PNG supports transparency, but HDR does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my PNG file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert PNG to HDR on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.