FLIF

FLIF is a novel lossless image format which outperforms PNG, lossless WebP, lossless BPG, lossless JPEG2000, and lossless JPEG XR in terms of compression ratio.

According to compression experiments performed, FLIF files are on average:

• 14% smaller than lossless WebP,
• 22% smaller than lossless BPG,
• 33% smaller than brute-force crushed PNG files (using ZopfliPNG),
• 43% smaller than typical PNG files,
• 46% smaller than optimized Adam7-interlaced PNG files,
• 53% smaller than lossless JPEG 2000 compression,
• 74% smaller than lossless JPEG XR compression.

Even if the best image format was picked out of PNG, JPEG 2000, WebP or BPG for a given image corpus, depending on the type of images (photograph, line art, 8 bit or higher bit depth, etc), then FLIF still beats that by 12% on a median corpus (or 19% on average, including 16-bit images which are not supported by WebP and BPG).