Convert JPEG XL to BMP

JPEG XL (.jxl) is a modern image format standardized as ISO/IEC 18181 in 2022 by the Joint Photographic Experts Group. It supports both lossy and lossless compression, high bit depth, HDR, wide color gamuts, transparency and animation, and typically produces files 30–60% smaller than JPEG at the same visual quality.

A distinctive feature is lossless JPEG recompression: an existing JPG can be converted to JPEG XL about 20% smaller and converted back to the exact original bytes.

Support is still growing. Safari (macOS Sonoma, iOS 17 and later) displays JPEG XL natively, and so do Photoshop, GIMP, Affinity Photo, darktable and IrfanView. Chrome and Edge removed their experimental support, and Firefox only offers it in Nightly builds, so convert JXL to JPG or PNG when you need an image that opens everywhere.

The BMP (Bitmap) format, formally known as the Device Independent Bitmap (DIB) file format, is a raster graphics standard developed by Microsoft for the Windows operating system. The file structure consists of a file header (BITMAPFILEHEADER), an information header (typically BITMAPINFOHEADER), a color table, and the pixel array. Data is stored as a grid of pixels with color depths ranging from 1-bit to 32-bit, typically uncompressed, though the format supports lossless Run-Length Encoding (RLE4 or RLE8) and Huffman 1D compression for specific bit depths.

Due to its simplicity and documentation as a core Windows standard, BMP files possess near-universal compatibility. They can be opened natively by virtually all image viewers and web browsers across Windows, macOS, and Linux without additional software. Standard utilities include Microsoft Paint, Apple Preview, and Windows Photos. For advanced manipulation, pixel-based editors like Adobe Photoshop and CorelDRAW are recommended, though the format is rarely used for complex editing due to its large file size.