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Punypng is a free online tool that functionally reduce image file size without losing image quality at all. By using several web optimization techniques to make compress on the size of the image file, this is the first service to analyze the contents of the image and find the best numbers to determine the image format. Usually depending on the type of file, punypng will automatically try to convert GIF to PNG format, and then tried to give emphasis to the image format the further. As an example for the format JPEGs, sometimes preferring punypng conversion into PNG format, and vice versa.

Below you can see result compressi punyPNG test benchmarked with other popular services.