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For PNG, there’s ”pngcrush”: <https://pmt.sourceforge.io/pngcrush/ https://pmt.sourceforge.io/pngcrush/>

• duskwuff 4mo ago
  pngcrush is pretty old. A newer, more effective option is oxipng: https://github.com/oxipng/oxipng https://github.com/oxipng/oxipng