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Zopfli is a data compression library that performs Deflate, gzip and zlib data encoding. It achieves higher compression ratios than mainstream Deflate and zlib implementations at the cost of being slower. Google first released Zopfli in February 2013 under the terms of Apache License 2.0.
The name Zöpfli is the Swiss German diminutive of “Zopf”, an unsweetened type of Hefezopf.
Because of its significantly slower compression speed, Zopfli is not suited for on-the-fly compression. It is typically used for one-time compression of static content. This is typically true for web content that is served with Deflate-based HTTP compression or web content in a Deflate-based file format such as PNG or WOFF font files. Another use case is software updates or downloads with software package files that have a zip-based format such as Android application packages (APK) or Java Archives (JAR), especially over mobile connections.
Since then, the open-source community made attempts to modify Zopfli for optimizing Portable Network Graphics (PNG) files because PNG uses a Deflate compression layer. The fruit of these modifications was ZopfliPNG, which was admitted into Google's Zopfli repository in May 2013. The Zopfli algorithm has also been integrated into other PNG compression optimization tools like advpng (from the AdvanceCOMP utility suite) and OxiPNG.
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