Convert HDR to PNM
Convert HDR files to PNM locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert HDR to PNM
- Drop your .hdr files above, or click Upload Files. You can add many files at once.
- PNM is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. ImageMagick runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .pnm files as soon as each one finishes.
What to know about HDR to PNM conversion
- PNM is best for image processing pipelines and scientific code, and opens in GIMP, ImageMagick and Netpbm tools.
HDR vs PNM
| Feature | HDR (Radiance HDR) | PNM (Netpbm Portable Anymap) |
|---|---|---|
| Compression | lossless | uncompressed |
| Transparency | No | No |
| Animation | No | No |
| Best for | HDR environment maps for lighting 3D scenes | image processing pipelines and scientific code |
| Opens in | Blender, 3D renderers and HDR viewers | GIMP, ImageMagick and Netpbm tools |
HDR (Radiance HDR): A high-dynamic-range RGBE image format commonly used for environment maps and lighting in 3D rendering.
PNM (Netpbm Portable Anymap): The generic Netpbm format family (PBM, PGM, PPM) for simple uncompressed bitmaps, graymaps and pixmaps.
Conversion options
- Resize by width, height or both (aspect ratio is preserved)
- Filters: grayscale, sepia, blur and sharpen
- Custom output file name
Frequently asked questions
Is it safe to convert HDR to PNM here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several HDR files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert PNM to HDR.
Convert HDR to other formats
- HDR to JPG
- HDR to PNG
- HDR to PDF
- HDR to WEBP
- HDR to GIF
- HDR to SVG
- HDR to AVIF
- HDR to ICO
- HDR to TIFF
- HDR to BMP
- HDR to JXL
- HDR to PSD
Convert other formats to PNM
- JPG to PNM
- PNG to PNM
- PDF to PNM
- WEBP to PNM
- HEIC to PNM
- GIF to PNM
- SVG to PNM
- AVIF to PNM
- ICO to PNM
- TIFF to PNM
- BMP to PNM
- JXL to PNM
See every HDR converter and PNM converter, or browse the full converter directory.