FLIF - free image compression format

FLIF (Free Lossless Image Format) is a new, free-to-use free compression format that surpasses PNG, lossless WebP, lossless BPG, lossless JPEG2000, and lossless JPEG XR.

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

• 14% less than lossless WebP,
• 22% less than lossless BPG,
• 33% less than PNG with brute force through ZopfliPNG,
• 43% less typical PNG,
• 46% less than PNG optimized by Adam7 interlaced image processing algorithm
• 53% less lossless JPEG2000,
• 74% less lossless JPEG XR.

Even if for each individual image to choose the best compression format among competitors, depending on the type of picture - photo, graphics, 8 bits or more - FLIF still has an advantage of about 12% in the median (or 19% on average). Thus, the key advantages of FLIF are the best compression ratio and versatility, working with any kind of images.
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FLIF defeats all competitors on all types of images . The results of comparative testing by type of images, see here .







Like some other formats, FLIF files have the property of “responsive download” when the preview of the preview version begins before the file is completely downloaded (see video).



And the most important thing is that 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 algorithms for entropy compression, 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 at IBM in the late 70s and early 80s. According to the available information , all patents for arithmetic coding have already expired, so there should be no complaints from IBM.