PNG to JXL — Format Comparison & Online Converter
Fast, instant PNG to JPEG XL conversion. No signup required. Just drop your .png file and get .jxl in seconds.
Batch Settings
Some metadata may not survive
Your PNG file may contain tEXt, iTXt metadata. JXL 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 JXL supports only 32 bits. You may notice banding in smooth gradients (like sky or skin tones) where subtle color transitions are lost.
色彩豊かな画像は、私たちの日常に喜びをもたらします。特に漫画やアニメ、ビジネス資料など、細部にまでこだわりたい場面では、画質の劣化は避けたいものです。PNG形式は広く使われていますが、ファイルサイズが大きくなりがちで、ウェブサイトの表示速度やストレージ容量に影響を与えることも。そこで注目されているのが、次世代の画像フォーマットJXL（JPEG XL）です。JXLは、PNGの持つ非可逆圧縮の利点を保ちつつ、さらに高い圧縮率を実現。これにより、美しい画像をより軽量に扱えるようになります。このページでは、お手持ちのPNG画像をJXL形式へ簡単に変換する方法をご紹介。快適なデジタルライフの一助となれば幸いです。
- 漫画・イラストのアーカイブ
- ビジネス資料の軽量化
- ウェブサイトの表示速度改善
縦書きの文書や、明朝体・ゴシック体などの美しいフォントを含む画像を扱う際、JXLは文字の輪郭を鮮明に保ちながら高い圧縮率を実現するため、日本のコンテンツとの相性が特に良いとされています。
About PNG to JPEG XL Conversion
PNG (introduced 1996) and JXL (introduced 2022) are both image formats, but they differ in important ways. PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots. JPEG XL is a next-generation format with both lossless and lossy modes, aiming to replace JPEG and PNG.
Full Name: PNG uses Portable Network Graphics, while JXL uses JPEG XL. Compression: PNG uses Lossless, while JXL uses Lossy & Lossless. Transparency: PNG uses Yes, while JXL uses Yes.
When you convert PNG to JXL, the goal is to upgrade to a modern format. Converting PNG to JXL maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your PNG file is decoded and re-encoded as JXL. The conversion involves 4 steps: (1) your png file is uploaded and the format is validated, (2) the file content is decoded into its raw representation, (3) the data is re-encoded in jxl format with optimal settings, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you specifically need a JXL file for your workflow. For the opposite direction, CocoConvert also supports JXL to PNG conversion.
How to Convert PNG to JPEG XL
- 1
Upload .png file
Select your PNG file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .jxl
Set JXL as the output format. The converter uses optimal settings based on the PNG→JXL conversion profile.
- 3
Convert
The server-side engine decodes your PNG file and re-encodes it as JXL. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .jxl file. Multiple output files can be downloaded together.
What Happens When You Convert PNG to JPEG XL
Your PNG image is decoded into raw pixel data, then re-encoded as JXL.
Your PNG file is decoded — the compressed/stored pixel data is expanded into raw RGBA (with alpha channel) 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
PNG vs JPEG XL — Detailed Comparison
| Feature | .PNG | .JXL |
|---|---|---|
| Full Name | Portable Network Graphics | JPEG XL |
| Compression | Lossless | Lossy & Lossless |
| Transparency | Yes | Yes |
| Animation | No | Yes |
| Color Depth | 8 or 16 bits/channel (up to 48-bit color) | up to 32 bits/channel |
| HDR Support | No | Yes |
| Typical File Size | 5–20 MB per photo, <1 MB for graphics | 40–60% smaller than JPEG |
| Platform Support | Universal | Very Limited |
| Browser Support | Universal | Limited |
| Year Created | 1996 | 2022 |
| Open Standard | Yes | Yes |
Should You Convert PNG to JPEG XL?
When to Convert
- ✓When you specifically need a JXL file for your workflow
Frequently Asked Questions
What is the difference between PNG and JXL?
PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots. JPEG XL is a next-generation format with both lossless and lossy modes, aiming to replace JPEG and PNG. Full Name: PNG uses Portable Network Graphics, while JXL uses JPEG XL. Compression: PNG uses Lossless, while JXL uses Lossy & Lossless. Transparency: PNG uses Yes, while JXL uses Yes.
Does PNG to JXL conversion affect quality?
Converting PNG to JXL maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, PNG or JXL?
PNG uses lossless compression. JXL uses both compression. The better choice depends on whether you prioritize file size or quality.
How long does PNG to JXL conversion take?
Most conversions finish in seconds. Larger files or complex image content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is PNG or JXL better for long-term storage?
PNG is better for archival since it's lossless.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.