JXL to TGA Converter

Encoding: the JXL uses lossy VarDCT or lossless modular coding; existing JPEGs can be repacked without loss; TGA uses uncompressed or run-length encoded (RLE), and the download is a run-length encoded 32-bit TGA with alpha.

Bit depth: 8 to 16 bits per channel, or floating point in the JXL; TGA allows 8, 15, 16, 24 or 32 bits per pixel, and the TGA written here has 32 bits per pixel. High-bit-depth JPEG XL files are reduced to 8 bits per channel.

Colour: sRGB, Display P3, linear and other spaces described in the codestream in the JXL; TGA supports RGB, greyscale or a colour map, written here as 8-bit sRGB.

Transparency: the JXL stores it as an extra channel in the codestream; the TGA keeps it as the fourth byte of each 32-bit pixel (or one bit in 16-bit files).

Animation: frames inside a single codestream; the TGA holds one image, so only the first frame is converted.

Metadata: the JXL can carry EXIF and XMP boxes in the container form, often stripped by encoders; TGA can carry an image ID field and an optional extension area with author and date, but nothing is copied across.

JPEG XL is a next-generation format designed to replace JPEG. It compresses better than JPEG and WebP, supports lossless, HDR and progressive decoding, and can losslessly repack existing JPEGs.

A JPEG XL file is either a bare codestream starting with FF 0A or an ISO base media container whose 'jxlc' box holds the codestream. A recompressed JPEG keeps a 'jbrd' box that lets the original JPEG bytes be rebuilt exactly.

JXL files usually come from image editors, archival pipelines and lossless JPEG recompression.

TGA is a simple raster format still widely used for game textures and 3D rendering pipelines because it stores alpha channels reliably and loads fast.

A TGA has an 18-byte header (ID length, colour map type, image type 2 for true colour or 10 for RLE, origin, size, bits per pixel and a descriptor byte whose bits give the alpha depth and whether rows run top-down), then the pixels; version 2 files end with a 'TRUEVISION-XFILE' footer.

TGA is the better choice for game textures and 3D software, while JXL suits archiving and future-proof high quality storage.

TGA strengths: Reliable alpha channel; Fast and simple to load; Common in game engines. Drawbacks to weigh: Large files; Not viewable in browsers.