oxipng – multithreaded PNG optimizer

Oxipng is a multithreaded lossless PNG compression optimizer. It can be used via a command-line interface or as a library in other Rust programs.

Oxipng began as a complete rewrite of the OptiPNG project.

This is free and open source software.

Features include:

  • Optimization – The default (-o 2) is sufficiently fast on a modern CPU and provides 30-50% compression gains over an unoptimized PNG. -o 4 is 6 times slower than -o 2 but can provide 5-10% extra compression over -o 2. Using any setting higher than -o 4 is unlikely to give any extra compression gains and is not recommended.
  • Interlacing – -i 1 will enable Adam7 PNG interlacing on any images that are processed, i 0 will remove interlacing from all processed images. Not specifying either will keep the same interlacing state as the input image. Note: Interlacing can add 25-50% to the size of an optimized image.
  • Strip – remove metadata info from processed images. This can save a few KB if the metadata information is needed.
  • Cross-platform support – runs under Linux, Mac OS and Windows.

Website: github.com/shssoichiro/oxipng
Developer: Joshua Holmer
License: MIT License

oxipng is written in Rust. Learn Rust with our recommended free books and free tutorials.

Return to Command-Line Image Compression Tools Home Page

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