optipng

optipng

TLDR

Compress a PNG with default settings

$ optipng [path/to/file.png]
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Compress a PNG with the best compression
$ optipng -o[7] [path/to/file.png]
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Compress a PNG with the fastest compression
$ optipng -o[0] [path/to/file.png]
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Compress a PNG and add interlacing
$ optipng -i [1] [path/to/file.png]
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Compress a PNG and preserve all metadata (including file timestamps)
$ optipng -preserve [path/to/file.png]
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Compress a PNG and remove all metadata
$ optipng -strip all [path/to/file.png]
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