PNG to JXL Converter
Encode PNG and APNG images to lossless or quality-controlled JPEG XL without reducing dimensions or silently dropping frames.
Reconstruction is not re-encoding
A JPEG-derived JXL can store the original JPEG structure. Reconstruction restores those exact original bytes. A new JPG encode decodes pixels and compresses them again, so its bytes and pixels may differ.
Format limits stay explicit
PNG and JPG cannot represent every JPEG XL HDR signal, extra channel, animation feature, or metadata box. Animated JXL is never sent to JPG, and animated PNG output uses APNG so frames are not silently discarded.