WARC (file format)

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(Redirected from Web ARChive)
Web ARChive
Filename extension
Internet media type
Extended fromARC[2]
StandardISO 28500:2017[3]
Open format?Yes

The WARC (Web ARChive) archive format specifies a method for combining multiple digital resources into an aggregate archive file together with related information. The WARC format is a revision of the Internet Archive's ARC_IA File Format[4] that has traditionally been used to store "web crawls" as sequences of content blocks harvested from the World Wide Web. The WARC format generalizes the older format to better support the harvesting, access, and exchange needs of archiving organizations. Besides the primary content currently recorded, the revision accommodates related secondary content, such as assigned metadata, abbreviated duplicate detection events (see §7.6 "revisit"), and later-date transformations.[5] The WARC format is inspired by HTTP/1.0 streams, with a similar header and the use of CRLFs as delimiters, making it very conducive to crawler implementations.

First specified in 2008,[6] WARC is now recognised by most national library systems as the standard to follow for web archiving.[7]



  1. ^ "application/warc". Retrieved 17 March 2018.
  2. ^ "Introduction". SourceForge. Retrieved 5 March 2015.
  3. ^ "Information and documentation -- WARC file format". Retrieved 16 March 2018.
  4. ^ "ARC_IA, Internet Archive ARC file format". www.digitalpreservation.gov. 14 February 2008. Retrieved 2015-05-09.
  5. ^ "WARC, Web ARChive file format". www.digitalpreservation.gov. 31 August 2009. Retrieved 2015-05-09.
  6. ^ Arvidson, Allan; Kunze, John; Mohr, Gordon; Stack, Michael (5 July 2008). "The WARC File Format". IETF. Retrieved 2021-04-29.
  7. ^ Allegrezza, Stefano (21 April 2016). "Nuove prospettive per il Web archiving: Gli standard ISO 28500 (Formato WARC) e ISO/TR 14873 sulla qualità del Web archiving". Digitalia. 2015: 49–61.
  8. ^ Scrivano, Giuseppe (August 6, 2012). "GNU wget 1.14 released". GNU wget 1.14 released. Free Software Foundation, Inc. Retrieved February 25, 2016.

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