AI Training Data Checker
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Common Crawl is the open web corpus behind most AI training data. Check whether your pages are in it, see real captured URLs, and learn what to fix.
Large language models learn from the open web, and Common Crawl is where most of that web comes from. Find out whether your pages made it in.
Checks the open corpus that trains AI models
Coverage across recent monthly crawls
Real captured URLs from your site
A simple presence score
What is this checking?
Common Crawl is a free, monthly archive of the web and the single largest public source of AI training data. Presence in it means the crawlers that feed AI models were able to reach your pages.
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See whether AI models were trained on your content
Most large language models learn from the open web, and Common Crawl is the biggest public source of that web. If your pages are not in Common Crawl, they are less likely to have been part of the data that trained today's AI models.
This free tool checks whether your domain appears in the recent Common Crawl snapshots, shows real captured URLs, and points you to fixes when your content is missing.
How the AI Training Data Checker works
Query the index
We look up your domain in the public Common Crawl index.
Check recent crawls
We check the most recent monthly snapshots for your pages.
Build your report
We summarize presence, samples, and recommendations in one report.
What this checker shows you
This free checker turns the public Common Crawl index into a clear answer about your AI training footprint.
Presence across recent crawls
Whether your domain appears in the most recent Common Crawl snapshots.
Captured page samples
Real example URLs from your site that Common Crawl captured.
Latest capture date
When Common Crawl last captured your pages.
Actionable recommendations
Clear next steps if AI crawlers are missing your content.
How it works
Check your AI training data footprint in three steps
A quick look at how we check your Common Crawl coverage.
Enter your website
Tell us the domain you want to check. No account needed.
We check recent crawls
We query the Common Crawl index across its most recent monthly snapshots.
Get your report
See whether you were captured, real example URLs, and what to fix.
Frequently asked questions
What is Common Crawl and why does it matter for AI?
Common Crawl is a free, open archive of the web that is crawled every month. It is the single largest public source of training data for large language models like those behind ChatGPT, Claude, and Gemini. If your pages are in Common Crawl, they were available to the crawlers that feed AI training.
How does this checker work?
We query the Common Crawl index for your domain across its most recent monthly snapshots. We report whether your site was captured, how many pages were indexed, real example URLs, and when the latest capture happened.
My site is not in Common Crawl. What should I do?
Common Crawl is a sample of the web and it lags real time by a few weeks, so a page missing from one snapshot is not proof it is invisible to AI. Consistent presence across crawls is the strong signal. To rule out access problems, also run the Robots.txt AI Bot Checker and the GEO Crawlability Checker.
More about AI training data
Answers to common questions about Common Crawl and AI training data.
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