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OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
License
zlib/libpng LicenseFollow OptiPNG
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User Reviews
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Great PNG optimizer! Extremely useful to design web sites, where each bit of info weights a gold.
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not as good as png gauntlet
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Great single-purpose image optimizer.
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A wonderful tool that can be left running in the evening with -o7 -zm1-9, and in the morning thousands PNG’s are magically shrunk without quality loss. Run them in parallel terminal to double, triple, quadruple the fun!
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Very effective even at default settings, and fast too. My favorite PNG optimization tool.