HDR vs JXL — Comparison & Free Converter
Fast, instant HDR to JPEG XL conversion. No signup required. Just drop your .hdr file and get .jxl in seconds.
Batch Settings
写真やイラストの表現は、私たちの文化において非常に重要な位置を占めています。特に、光と影の豊かな階調は、作品に深みと生命を吹き込む上で欠かせません。HDR（ハイダイナミックレンジ）画像が持つ広範な色域と輝度情報は、これまでのデジタル表現の限界を大きく押し広げてきました。しかし、その恩恵を最大限に享受しつつ、より効率的で未来志向の画像フォーマットへと移行したいと考える方もいらっしゃるでしょう。 そこで注目されるのがJXL（JPEG XL）です。この次世代フォーマットは、HDRの持つ鮮やかな情報を損なうことなく、高い圧縮率と多様な機能を提供します。ファイルサイズの削減は、ウェブサイトの表示速度向上やストレージの節約に直結し、また、可逆圧縮と非可逆圧縮の両方をサポートすることで、用途に応じた最適な画質管理が可能になります。 このページでは、お手持ちのHDR画像をJXL形式へ変換するプロセスを、日本のユーザーの皆様にとって分かりやすくご案内いたします。ぜひ、この機会にJXLの可能性をご体験ください。
- 漫画・イラストのデジタルアーカイブ
- ビジネス資料の高品質共有
- 写真展作品のウェブ公開
日本の多くの画像コンテンツでは、文字情報との親和性や、縦書きレイアウトへの対応も重視されます。JXLは、これらの要素を考慮した上でも、高精細な画像表現を可能にします。
About HDR to JPEG XL Conversion
HDR or JXL — which format should you use? The answer depends on your needs. Here's a quick breakdown.
HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering. It has niche platform support. JPEG XL is a next-generation format with both lossless and lossy modes, aiming to replace JPEG and PNG. It has niche platform support.
Full Name: HDR uses Radiance HDR Image, while JXL uses JPEG XL. Compression: HDR uses Lossless, while JXL uses Lossy & Lossless. Transparency: HDR uses No, while JXL uses Yes.
So when should you convert HDR to JXL? This conversion is ideal when you When you specifically need a JXL file for your workflow. This conversion helps you upgrade to a modern format.
Converting HDR to JXL maintains high quality with CocoConvert's optimised encoder settings.
If you've decided JXL is the right choice, CocoConvert makes the conversion effortless. Upload your .hdr file, pick JXL, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert HDR to JPEG XL
- 1
Choose your HDR file
Upload your .hdr file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to JXL
Select .jxl from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large image files.
- 4
Get your JXL file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert HDR to JPEG XL
Your HDR image is decoded into raw pixel data, then re-encoded as JXL.
Your HDR file is decoded — the compressed/stored pixel data is expanded into raw RGB pixels
Pixels are re-encoded using JPEG XL's lossless compression
Metadata (EXIF, ICC profiles) is transferred where JXL supports it
The JXL file is saved and ready for download
HDR vs JPEG XL — Detailed Comparison
| Feature | .HDR | .JXL |
|---|---|---|
| Full Name | Radiance HDR Image | JPEG XL |
| Compression | Lossless | Lossy & Lossless |
| Transparency | No | Yes |
| Animation | No | Yes |
| Color Depth | 32-bit float (RGBE encoding) | up to 32 bits/channel |
| HDR Support | Yes | Yes |
| Typical File Size | 5–50 MB | 40–60% smaller than JPEG |
| Platform Support | Very Limited | Very Limited |
| Browser Support | none | Limited |
| Year Created | 1985 | 2022 |
| Open Standard | Yes | Yes |
Should You Convert HDR to JPEG XL?
When to Convert
- ✓When you specifically need a JXL file for your workflow
Frequently Asked Questions
Should I use HDR or JXL?
It depends on your goal. HDR preserves full quality. JXL preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is JXL higher quality than HDR?
Not necessarily. Converting HDR to JXL maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert HDR to JXL on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for HDR to JXL?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for HDR to JXL?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.