|Type of business||501(c)(3) non-profit|
|Headquarters||San Francisco, California; Los Angeles, California, United States|
|Key people||Peter Norvig, Nova Spivack, Carl Malamud, Kurt Bollacker, Joi Ito|
Common Crawl is a nonprofit 501(c)(3) organization that crawls the web and freely provides its archives and datasets to the public. Common Crawl's web archive consists of petabytes of data collected since 2008. It completes crawls generally every month.
Common Crawl was founded by Gil Elbaz. Advisors to the non-profit include Peter Norvig and Joi Ito. The organization's crawlers respect nofollow and robots.txt policies. Open source code for processing Common Crawl's data set is publicly available.
The Common Crawl dataset includes copyrighted work and is distributed from the US under fair use claims. Researchers in other countries have made use of techniques such as shuffling sentences or referencing the common crawl dataset to work around copyright law in other legal jurisdictions.
As of March 2023, in the most recent version of the Common Crawl dataset, 46% of documents had English as their primary language (followed by German, Russian, Japanese, French, Spanish and Chinese, all below 6%).
In December 2012, blekko donated to Common Crawl search engine metadata blekko gathered from crawls it conducted from February to October 2012. The donated data helped Common Crawl "improve its crawl while avoiding spam, porn and the influence of excessive SEO."
In 2013, Common Crawl began using Apache Software Foundation's Nutch webcrawler instead of a custom crawler. Common Crawl switched from using .arc files to .warc files with its November 2013 crawl.
Timeline of Common Crawl data
The following data have been collected from the official Common Crawl Blog.
|Crawl date||Size in TiB||Billions of pages||Comments|
|June 2023||390||3.1||Crawl conducted from May 27 to June 11, 2023|
|April 2023||400||3.1||Crawl conducted from March 20 to April 2, 2023|
|February 2023||400||3.15||Crawl conducted from January 26 to February 9, 2023|
|December 2022||420||3.35||Crawl conducted from November 26 to December 10, 2022|
|October 2022||380||3.15||Crawl conducted in September and October 2022|
|March 2014||223||2.8||First Nutch crawl|
|January 2014||148||2.3||Crawls performed monthly|
|November 2013||102||2||Data in Warc file format|
|July 2012||—||—||Data in Arc file format|
|January 2012||—||—||Public Data Set of Amazon Web Services|
|November 2011||40||5||First availability on Amazon|
Norvig Web Data Science Award
In corroboration with SURFsara, Common Crawl sponsors the Norvig Web Data Science Award, a competition open to students and researchers in Benelux. The award is named for Peter Norvig who also chairs the judging committee for the award.
Google Colossal Clean Crawled Corpus
- Rosanna Xia (February 5, 2012). "Tech entrepreneur Gil Elbaz made it big in L.A." Los Angeles Times. Retrieved July 31, 2014.
- "Gil Elbaz and Common Crawl". NBC News. April 4, 2013. Retrieved July 31, 2014.
- "So you're ready to get started". Common Crawl. Retrieved 9 June 2023.
- Lisa Green (January 8, 2014). "Winter 2013 Crawl Data Now Available". Retrieved June 2, 2018.
- "Startups - Gil Elbaz and Nova Spivack of Common Crawl - TWiST #222". This Week In Startups. January 10, 2012.
- Tom Simonite (January 23, 2013). "A Free Database of the Entire Web May Spawn the Next Google". MIT Technology Review. Retrieved July 31, 2014.
- Schäfer, Roland (May 2016). "CommonCOW: Massively Huge Web Corpora from CommonCrawl Data and a Method to Distribute them Freely under Restrictive EU Copyright Laws". Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16). Portorož, Slovenia: European Language Resources Association (ELRA): 4501.
- "Statistics of Common Crawl Monthly Archives by commoncrawl". commoncrawl.github.io. Retrieved 2023-04-02.
- Jennifer Zaino (March 13, 2012). "Common Crawl To Add New Data In Amazon Web Services Bucket". Semantic Web. Archived from the original on July 1, 2014. Retrieved July 31, 2014.
- Jennifer Zaino (July 16, 2012). "Common Crawl Corpus Update Makes Web Crawl Data More Efficient, Approachable For Users To Explore". Semantic Web. Archived from the original on August 12, 2014. Retrieved July 31, 2014.
- Jennifer Zaino (December 18, 2012). "Blekko Data Donation Is A Big Benefit To Common Crawl". Semantic Web. Archived from the original on August 12, 2014. Retrieved July 31, 2014.
- Jordan Mendelson (February 20, 2014). "Common Crawl's Move to Nutch". Common Crawl. Retrieved July 31, 2014.
- Jordan Mendelson (November 27, 2013). "New Crawl Data Available!". Common Crawl. Retrieved July 31, 2014.
- Brown, Tom; Mann, Benjamin; Ryder, Nick; Subbiah, Melanie; Kaplan, Jared; Dhariwal, Prafulla; Neelakantan, Arvind; Shyam, Pranav; Sastry, Girish; Askell, Amanda; Agarwal, Sandhini (2020-06-01). "Language Models are Few-Shot Learners". p. 14. arXiv:2005.14165 [cs.CL].
the majority of our data is derived from raw Common Crawl with only quality-based filtering.
- "Blog – Common Crawl".
- Lisa Green (November 15, 2012). "The Norvig Web Data Science Award". Common Crawl. Retrieved July 31, 2014.
- "Norvig Web Data Science Award 2014". Dutch Techcentre for Life Sciences. Archived from the original on August 15, 2014. Retrieved July 31, 2014.
- "Google achieves state-of-the-art NLP performance with an enormous language model and data set". VentureBeat. 2019-10-24. Retrieved 2023-04-21.
- Hern, Alex; editor, Alex Hern UK technology (2023-04-20). "Fresh concerns raised over sources of training material for AI systems". The Guardian. ISSN 0261-3077. Retrieved 2023-04-21.
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