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OSCON 2012

OSCON 2012

We're just one month away from one of the biggest and most exciting events of the year, O'Reilly's Open Source Convention (OSCON). This year's conference will be held July 16th-20th in Portland, Oregon.
Learn Hadoop and get a paper published

Learn Hadoop and get a paper published

We're looking for students who want to try out the Apache Hadoop platform and get a technical report published.
Big Data Week: meetups in SF and around the world

Big Data Week: meetups in SF and around the world

Big Data Week aims to connect data enthusiasts, technologists, and professionals across the globe through a series of meet-ups. The idea is to build community among groups working on big data and to spur conversations about relevant topics ranging from technology to commercial use cases.
Twelve steps to running your Ruby code across five billion web pages

Twelve steps to running your Ruby code across five billion web pages

The following is a guest blog post by Pete Warden, a member of the Common Crawl Advisory Board. Pete is a British-born programmer living in San Francisco. After spending over a decade as a software engineer, including 5 years at Apple, he’s now focused on a career as a mad scientist.
Web Data Commons

Web Data Commons

For the last few months, we have been talking with Chris Bizer and Hannes Mühleisen at the Freie Universität Berlin about their work and we have been greatly looking forward the announcement of the Web Data Commons.
Common Crawl's Advisory Board

Common Crawl's Advisory Board

As part of our ongoing effort to grow Common Crawl into a truly useful and innovative tool, we recently formed an Advisory Board to guide us in our efforts. We have a stellar line-up of advisory board members who will lend their passion and expertise in numerous fields as we grow our vision.
Video Tutorial: MapReduce for the Masses

Video Tutorial: MapReduce for the Masses

Learn how you can harness the power of MapReduce data analysis against the Common Crawl dataset with nothing more than five minutes of your time, a bit of local configuration, and 25 cents.
Gil Elbaz and Nova Spivack on This Week in Startups

Gil Elbaz and Nova Spivack on This Week in Startups

Nova and Gil, in discussion with host Jason Calacanis, explore in depth what Common Crawl is all about and how it fits into the larger picture of online search and indexing. Underlying their conversation is an exploration of how Common Crawl's open crawl of the web is a powerful asset for educators, researchers, and entrepreneurs.
Video: This Week in Startups - Gil Elbaz and Nova Spivack

Video: This Week in Startups - Gil Elbaz and Nova Spivack

Nova and Gil, in discussion with host Jason Calacanis, explore in depth what Common Crawl is all about and how it fits into the larger picture of online search and indexing.
MapReduce for the Masses: Zero to Hadoop in Five Minutes with Common Crawl

MapReduce for the Masses: Zero to Hadoop in Five Minutes with Common Crawl

Common Crawl aims to change the big data game with our repository of over 40 terabytes of high-quality web crawl information into the Amazon cloud, the net total of 5 billion crawled pages.
Common Crawl Discussion List

Common Crawl Discussion List

We have started a Common Crawl discussion list to enable discussions and encourage collaboration between the community of coders, hackers, data scientists, developers and organizations interested in working with open web crawl data.
Answers to Recent Community Questions

Answers to Recent Community Questions

In this post we respond to the most common questions. Thanks for all the support and please keep the questions coming!
Common Crawl Enters A New Phase

Common Crawl Enters A New Phase

A little under four years ago, Gil Elbaz formed the Common Crawl Foundation. He was driven by a desire to ensure a truly open web. He knew that decreasing storage and bandwidth costs, along with the increasing ease of crunching big data, made building and maintaining an open repository of web crawl data feasible.
Video: Gil Elbaz at Web 2.0 Summit 2011

Video: Gil Elbaz at Web 2.0 Summit 2011

Hear Common Crawl founder discuss how data accessibility is crucial to increasing rates of innovation as well as give ideas on how to facilitate increased access to data.

Common Crawl Blog

Setting the Record Straight: Common Crawl’s Commitment to Transparency, Fair Use, and the Public Good

November 4, 2025

A recent article in The Atlantic makes several false and misleading claims about the Common Crawl Foundation, including the accusation that our organization has “lied to publishers” about our activities.

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October/November 2025 Newsletter

November 3, 2025

Check out our newsletter for October/November 2025, with updates on what we've been up to

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Common Crawl Foundation at Stanford HAI

October 27, 2025

The Common Crawl team presented a seminar at Stanford HAI entitled “Preserving Humanity's Knowledge and Making it Accessible: Addressing Challenges of Public Web Data”.

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Host- and Domain-Level Web Graphs August, September, and October 2025

October 25, 2025

We are pleased to announce a new release of host-level and domain-level web graphs based on the crawls of August, September, and October 2025, consisting of of 468.4 million nodes and 8.0 billion edges at the host level, and 97.7 million nodes and 6.0 billion edges at the domain level.

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October 2025 Crawl Archive Now Available

October 23, 2025

We are pleased to announce the release of the October 2025 crawl, containing 2.61 billion web pages or 468 TiB of uncompressed content.

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Common Crawl Foundation at COLM 2025

October 20, 2025

The Common Crawl team attended the 2nd Conference on Language Modeling in Montréal, organizing a workshop, giving invited talks, and strengthening links with the research community.

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Announcing GneissWeb Annotations

October 6, 2025

Common Crawl has added IBM’s GneissWeb quality and category annotations to its web dataset, enabling users to filter high-quality content and explore topics like medical, education, and technology.

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Web Languages Needing Review by Native Speakers

September 29, 2025

Common Crawl’s Web Languages initiative has had many contributions since its introduction. We’re calling for native speakers of certain languages to review language contributions, to ensure that links we’re adding to our seed crawl are of good quality.

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Host- and Domain-Level Web Graphs July, August, and September 2025

September 25, 2025

We are pleased to announce a new release of host-level and domain-level web graphs based on the crawls of July, August, and September 2025. The host-level graph consists of 628.7 million nodes and 6.9 billion edges, and the domain-level graph consists of 184.6 million nodes and 5.4 billion edges.

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From SEO to AIO: Why Your Content Needs to Exist in AI Training Data

September 23, 2025

The era of traditional search engine optimization is rapidly evolving into "AIO" (AI optimization), where businesses must ensure their content exists in AI training datasets to remain discoverable as users increasingly turn to AI assistants for answers, a shift that's already driving real business impact today and making presence in AI training data as strategically vital as traditional search rankings once were.

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September 2025 Crawl Archive Now Available

September 22, 2025

We are pleased to announce the release of our September 2025 crawl, containing 2.39 billion web pages, or 421 TiB of uncompressed content.

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Common Crawl Foundation Opt-Out Registry

September 17, 2025

Publishers have been sending Common Crawl legal opt-out requests. In the interest of transparency and to better serve our ecosystem, we are publishing the full opt-out list for every legal request we have received.

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Trip Report: AI_dev (Linux Foundation) August 2025

September 15, 2025

On the 28th and 29th of August 2025, Thom Vaughan, Pedro Ortiz Suarez, and Thijs Dalhuijsen attended the Linux Foundation’s AI_dev event in Amsterdam.

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Common Crawl Foundation at Stanford HAI: A Shared Legacy of Data and Innovation

September 8, 2025

Stanford HAI and Common Crawl are joining forces to explore how open data can shape the future of AI. On 22 October 2025, their seminar will address privacy, safety, and security while showcasing new ways to preserve and share humanity’s knowledge.

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July/August 2025 Newsletter

August 26, 2025

We are pleased to release our newsletter for July and August 2025, with updates on our team's activities.

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Host- and Domain-Level Web Graphs June, July, and August 2025

August 21, 2025

We are pleased to announce a new release of host-level and domain-level web graphs based on the crawls of June, July, and August 2025. The host-level graph consists of 691.1 million nodes and 5.0 billion edges, and the domain-level graph consists of 207.6 million nodes and 3.9 billion edges.

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August 2025 Crawl Archive Now Available

August 18, 2025

We are pleased to announce the release of our August 2025 crawl, containing 2.44 billion web pages (or 424 TiB of uncompressed content).

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Common Crawl Foundation at ACL 2025

August 13, 2025

The Common Crawl team attended the 63rd Annual Meeting of the Association of Computational Linguistics in Vienna, presenting recent published work and strengthening links with the research community.

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AI Optimization Is Here: Are You Ready for Search 2.0?

August 11, 2025

Publishers and brands are shifting from SEO to AIO. Many SEOs unknowingly block their sites from AI search by restricting CCBot in robots.txt. As Search 2.0 transforms discovery, ensuring content can train AI models becomes as crucial as traditional SEO.

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IETF 123 Report

August 4, 2025

A report on IETF 123 in Madrid, including sessions on AI content preferences, bot authentication, and web measurement.

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Host- and Domain-Level Web Graphs May, June, and July 2025

July 25, 2025

Our Web Graph release for July 2025 is now available, consisting of 481.6 million nodes and 3.4 billion edges at the host level, and 209.5 million nodes and 2.6 billion edges at the domain level.

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July 2025 Crawl Archive Now Available

July 23, 2025

The crawl archive for July 2025 is now available. Crawled between July 7th and July 21st, the data contains 2.42 billion web pages, or 419 TiB of uncompressed content.

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WMDQS Shared Task on Language Identification

July 21, 2025

The Common Crawl Foundation, MLCommons, EleutherAI, and John Hopkins' Center for Language and Speech Processing have the pleasure of inviting you to register for the 1st shared task on Language Identification for web data.

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The First WMDQS-Masakhane LangID Hackathon

July 8, 2025

In June 2025 the Common Crawl Foundation, MLCommons, and EleutherAI had the pleasure of hosting a virtual hackathon in partnership with Masakhane in order to collect language identification annotations for African languages.

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Host- and Domain-Level Web Graphs April, May, and June 2025

July 1, 2025

We are pleased to announce that the Web Graph for June 2025 is now available. The graph consists of 371.6 million nodes and 3.1 billion edges at the host level, and 161.8 million nodes and 2.2 billion edges at the domain level.

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