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The ZIM file format is an open file format that stores website content for offline usage. [1] The format is defined by the openZIM project, which also supports an open-source ZIM reader called Kiwix. The format is primarily used to store the contents of Wikipedia and other Wikimedia projects, including articles, full-text search indices and auxiliary files. [2] [3]
ZIM stands for "Zeno IMproved", [4] [5] as it replaced the earlier Zeno file format. Since 2021, the library defaults to Zstandard file compression [6] and also supports LZMA2, as implemented by the XZ Utils library. The openZIM project is sponsored by Wikimedia CH and supported by the Wikimedia Foundation.