Web ARChive

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Web ARChive
Filename extension .warc
Internet media type application/warc[1]
Extended from ARC[2]
Standard ISO 28500:2009[3][4]
Open format? Yes
Website archive-access.sourceforge.net/warc/

The Web ARChive (WARC) 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 File Format[5] 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, and later-date transformations.[6]

WARC is now recognised by most national library systems as the standard to follow for web archival.[7]


  1. ^ "application/warc". Retrieved 5 March 2015. 
  2. ^ "Introduction". Retrieved 5 March 2015. 
  3. ^ "Information and documentation -- WARC file format". Retrieved 5 March 2015. 
  4. ^ http://www.iso.org/iso/pressrelease.htm?refid=Ref1255
  5. ^ "ARC_IA, Internet Archive ARC file format". www.digitalpreservation.gov. Retrieved 2015-05-09. 
  6. ^ "WARC, Web ARChive file format". www.digitalpreservation.gov. Retrieved 2015-05-09. 
  7. ^ http://digitalia.sbn.it/article/view/1473

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