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[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, and later-date transformations.[5]

WARC is now recognised by most national library systems as the standard to follow for web archival.[6]


Heritrix web archiver in Java
wget (since version 1.14[7])
Apache Nutch


  1. ^ "application/warc". Retrieved 17 March 2018. 
  2. ^ "Introduction". 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. Retrieved 2015-05-09. 
  5. ^ "WARC, Web ARChive file format". www.digitalpreservation.gov. Retrieved 2015-05-09. 
  6. ^ http://digitalia.sbn.it/article/view/1473
  7. ^ Scrivano, Giuseppe (August 6, 2012). "GNU wget 1.14 released". GNU wget 1.14 released. Free Software Foundation, Inc. Retrieved February 25, 2016. 

External links