Decode JPEG XL Images

Extract images from JPEG XL (.jxl) files using djxl. Outputs PNG or JPEG, with optional recovery of original JPEG bitstream if the source JXL was a lossless JPEG transcode.

When to use

• Converting JXL files back to PNG for general use or compatibility.
• Recovering the original JPEG bitstream from a lossless-transcoded JXL file via djxl --jpeg.
• Batch-decoding a JXL archive to portable formats.

Inputs to gather

• Input .jxl file or directory — single file or folder.
• Output format — png (default) or jpeg. If the user has a JXL that came from a lossless JPEG transcode and wants to recover the original JPEG byte-exact, offer the jpeg format and explain the --jpeg flag.
• Output directory — optional. Default: same directory as input.

Procedure

1. Check tooling