Zim vs WARC ?

This page summarizes the projects mentioned and recommended in the original post on /r/Kiwix

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  • zimit

    Make a ZIM file from any Web site and surf offline!

  • There are clearly similarities between the two, given that Kiwix put resources into making WARC content available in ZIM archives (i.e. Zimit-style ZIMs, created with the Zimit scraper and warc2zim backend). But as u/IMayBeABitShy said, the ZIM specification focuses on providing a highly compressed container that is readable on-the-fly (i.e. by decompressing only the needed content to show an article), whereas WARC, or rather the compressed version WACZ, is merely a zipped version of the WARC data (request headers and responses). It is also readable on-the-fly, but compression will not be as optimal as the zstandard compression used by modern ZIM archives.

  • warc2zim

    Command line tool to convert a file in the WARC format to a file in the ZIM format

  • There are clearly similarities between the two, given that Kiwix put resources into making WARC content available in ZIM archives (i.e. Zimit-style ZIMs, created with the Zimit scraper and warc2zim backend). But as u/IMayBeABitShy said, the ZIM specification focuses on providing a highly compressed container that is readable on-the-fly (i.e. by decompressing only the needed content to show an article), whereas WARC, or rather the compressed version WACZ, is merely a zipped version of the WARC data (request headers and responses). It is also readable on-the-fly, but compression will not be as optimal as the zstandard compression used by modern ZIM archives.

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