JPEG XL
| Filename extension |
.jxl |
|---|---|
| Internet media type |
image/jxl |
| Uniform Type Identifier (UTI) | public.jpeg-xl |
| Magic number | FF 0A or 00 00 00 0C 4A 58 4C 20 0D 0A 87 0A |
| Developed by | |
| Type of format | Lossy/lossless bitmap image format |
| Extended from | |
| Standard | ISO/IEC 18181 |
| Open format? | Yes (royalty-free) |
| Website |
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The JPEG XL Image Coding System is a royalty-free open standard for a compressed raster image format. It defines a graphics file format and the abstract device for coding JPEG XL bitstreams. It is developed by the Joint Photographic Experts Group (JPEG) and standardized by the International Electrotechnical Commission (IEC) and the International Organization for Standardization (ISO) as the international standard ISO/IEC 18181. As a superset of JPEG/JFIF encoding, it features a compression mode built on a traditional block-based transform coding core. Additionally, there is a "modular mode" for synthetic image content and lossless compression. Optional lossy quantization enables both lossless and lossy compression.
The name refers to the design committee (JPEG), the X designates the series of its image coding standards published since 2000 (JPEG XT/XR/XS), and L stands for "long-term", highlighting the intent to create a future-proof, long-lived format to succeed JPEG/JFIF.
The main authors of the specification are Jon Sneyers, Jyrki Alakuijala, and Luca Versari. Other collaborators are Sami Boukortt, Alex Deymo, Moritz Firsching, Thomas Fischbacher, Eugene Kliuchnikov, Robert Obryk, Alexander Rhatushnyak, Zoltan Szabadka, Lode Vandevenne, and Jan Wassenberg.