HDR to AVIF Converter
Processing entirely on your device — large files may take a moment.
AVIF delivers the smallest files at top visual quality for modern websites — it is supported by all current browsers. If your files are still in HDR format, this page is the shortcut: HDR (Radiance RGBE) stores floating-point high-dynamic-range pixels — the format of lighting data and HDRI environment maps.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How HDR compares to AVIF
| HDR | AVIF | |
|---|---|---|
| Compression | RGBE (RLE runs) | Lossy (AV1), lossless variant |
| Transparency | Not supported | Supported |
| Animation | Not supported | Supported |
| Metadata | Radiance comments | EXIF, ICC embeddable |
| Best for | Lighting data, environment maps | High-performance web images |
How to convert HDR to AVIF
- 1
Select your files
Drag & drop your HDR files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to AVIF". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted AVIF file individually, or grab everything at once as a ZIP archive.
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
About the AVIF format
AVIF wraps AV1 intra-frame coding inside a HEIF container, championed by Netflix and the Alliance for Open Media. It is currently the compression king of still images: at typical web sizes it beats JPG and WebP visibly, it inherits 10/12-bit color, HDR and wide gamut from its video heritage, and it animates. Being AV1-based, it is royalty-free.
The trade-off is encoding cost: AVIF encoding is genuinely slow in software, which matters for build pipelines and batch jobs. Support is solid in every current browser (Safari since 16.4, Chrome since 85), while many native apps and older photo tools still shrug at it.
+ Strengths
- ✓Best-in-class compression at web sizes
- ✓HDR, 10/12-bit color and wide gamut supported
- ✓Royalty-free (AV1) and animation-capable
! Limitations
- −Encoding is slow, especially in software
- −Native app and photo-tool support still maturing
- −No progressive decoding
Why convert HDR to AVIF?
There is a concrete reason this conversion exists: Not display-ready — needs tone mapping AVIF sidesteps that — Best-in-class compression at web sizes If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this HDR to AVIF converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will converting HDR to AVIF reduce quality?
AVIF uses lossy compression, so a small amount of recompression is unavoidable. The quality slider lets you choose between maximum fidelity and smallest file size — the default is visually indistinguishable for photos.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your HDR files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.
Can I convert several HDR files at once?
Yes — drop as many files as you like into the tool and they are converted in one batch. When more than one file comes out, everything is bundled into a ZIP for a single download.