A crawl trap is a part of a site that generates an effectively endless stream of low-value URLs, causing crawlers to waste requests on pages that should never be indexed.
Common sources are faceted navigation that multiplies filter combinations, calendars with "next month" links running forever, session IDs or tracking parameters appended to URLs, infinite pagination, and search-result pages that link to more search-result pages. Each variation looks like a unique URL to a crawler, so a handful of templates can spawn millions of crawlable addresses.
The damage is wasted crawl budget and index bloat. Time Googlebot spends looping through parameter permutations is time it does not spend on the pages that matter, and if the junk URLs get indexed they dilute the site's quality signals. On large sites a single unaddressed trap can noticeably slow discovery of legitimate new content.
Fixes include blocking problematic paths and parameters in robots.txt, applying canonical tags to consolidate near-duplicates, adding nofollow to links that lead into infinite spaces, and avoiding linking to filtered or calendar URLs that have no standalone value. The goal is to keep crawlers on a finite, meaningful set of URLs.
Related: Faceted navigation, Crawl budget, Index bloat, Robots.txt reference
Claude Vincent is a technical SEO consultant focused on crawlability, rendering, and AI-search visibility. He writes the field guides and case studies at SEO ProCheck, with a bias toward the durable, unglamorous work that decides whether search engines and AI answer engines can actually read and cite a site.
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