JPEG XL integrates https://github.com/google/brunsli https://github.com/google/brunsli , and when used in that mode, you can go back to the original JPEG file i

JPEG XL integrates https://github.com/google/brunsli https://github.com/google/brunsli , and when used in that mode, you can go back to the original JPEG file in a bit-exact way. There is also a mode that only preserves the JPEG image data.