- 可以把現有的 JPEG 再無損壓縮（可以完全恢復原JPEG檔）榨出 20%，類似 Dropbox 的 Lepton
- 支援 lossless 壓縮（比 png 壓縮率更佳）
- 支援 animation
- 支援 progressive decoding，縮圖可以只要讀取檔案的前面一小部分
- Royalty Free
有沒有 alpha channel?
JPEG XL further includes features such as animations, alpha channels, lossless and progressive coding to support a wide range of use cases including but not limited to photo galleries, e-commerce, social media, user interfaces and cloud storage. To enable novel applications, it also adds support for 360 degree images, image bursts, large panoramas/mosaics, and printing.