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JPEG XL is the format the imaging world has been waiting for. It compresses photos 20-60% better than JPEG at the same quality, supports lossless compression (replacing PNG), handles transparency, animation, HDR, and wide colour gamut — all in one format. It can even losslessly recompress existing JPEG files to 20% smaller, then reconstruct the original JPEG bit-for-bit. No other format does this.
The technical pedigree is impeccable: it combines Google's PIK research with Cloudinary's FUIF format, standardised by the JPEG committee as the official successor to JPEG. Progressive decoding means images appear quickly at low quality then sharpen, exactly like progressive JPEG but better.
The adoption story is more complicated. Chrome added then removed JPEG XL support (controversially). Safari supports it. Firefox is working on it. The format's future depends on browser adoption. For now, it's used in photography workflows (darktable, RawTherapee), image archives, and by early-adopter CDNs. If browsers fully adopt it, JPEG XL could genuinely replace JPEG, PNG, and GIF in one format.