FLIF - Free Image Compression Format

    FLIF (Free Lossless Image Format) is a new free compression format without loss of quality that surpasses PNG, lossless WebP, lossless BPG, lossless JPEG2000 and lossless JPEG XR in compression ratio.

    As comparative testing ( results ) showed , FLIF files on average:

    • 14% less than lossless WebP,
    • 22% less than lossless BPG,
    • 33% less than PNG with bruteforce via ZopfliPNG,
    • 43% less than typical PNG,
    • 46% less PNG, optimized by the Adam7 interlacing algorithm,
    • 53% less lossless JPEG2000,
    • 74% less lossless JPEG XR.

    Even if you choose the best compression format for each individual image among competitors, depending on the type of image - photo, graphic, 8 bits or more - FLIF still has an advantage of about 12% in median (or 19% on average). Thus, the key advantages of FLIF are the best compression ratio and versatility, work with any kind of image.



    FLIF defeats all competitors in all types of images . See comparative test results for image types here .







    Like some other formats, FLIF files have the “responsive download” feature when the preview version starts showing before the file is fully downloaded (see video).



    Well and most importantly, FLIF is an absolutely free format under the LGPL license, it is completely devoid of patent restrictions and royalties.

    FLIF uses arithmetic coding , one of the entropy compression algorithms, like the FFV1 video codec . It was the latter that inspired developers to create a new compression format, and thanks to arithmetic coding, such impressive results were obtained. Arithmetic coding was invented by IBM in the late 70s - early 80s. According to available information , all patents for arithmetic coding have already expired, so there should be no claims from IBM.

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