Brunsli and Lepton are both sequential. In JPEG XL, there's both the original sequential Brunsli, and a tiled version of it (using groups of 256x256 pixels) wh

Brunsli and Lepton are both sequential. In JPEG XL, there's both the original sequential Brunsli, and a tiled version of it (using groups of 256x256 pixels) which can be encoded/decoded in parallel. If you have a 4:4:4 JPEG (no chroma subsampling), you can also instead of Brunsli, use the VarDCT mode of JPEG XL, where all the block sizes happen to be 8x8. Compression is similar to that of Brunsli, and it's even slightly faster (but it doesn't allow you to reconstruct the JPEG _file_ exactly, only the _image_ itself is lossless in that case).