Crawl depth counts the steps between a starting point and a page, following links. The homepage is usually depth 0, pages linked from it are depth 1, and so on. The term is mostly used by SEO crawling tools rather than by search engines, whose bots do not have to start from your homepage and can also find URLs through sitemaps and external links. It remains a useful way to measure how well a site's internal links reach its pages.
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Crawl depth and click depth
The two ideas overlap. Click depth describes the number of clicks a person needs to reach a page. Crawl depth is what a crawler measures by following links in the HTML, so it can differ when navigation only appears after a click or relies on links that are not real anchor elements.
Google says it generally crawls a link only if it is an a element with an href attribute, so a page reachable only through a script action may look close to a person and far away, or missing, to a crawler.
Why deep pages can struggle
Google has not published a depth limit, so treat any specific number of levels as a rule of thumb. The practical argument is simpler: a page with few internal links from a long way down the site tends to be harder to discover and tends to receive less link equity than a page linked from main navigation.
On large sites, this overlaps with crawl budget. Google's guidance for large sites focuses on keeping the URL inventory clean, because crawl demand and capacity are limited.
How to reduce depth
Run a crawl with an SEO tool, then sort valuable pages by depth and by number of incoming internal links. The fixes are normally structural.
- Link hub and category pages from main navigation
- Add related links between pages on the same topic
- Replace long paginated lists with narrower category pages where possible
- Use crawlable a elements with href attributes for navigation
- Keep an XML sitemap for discovery, alongside internal links rather than in place of them
Example
Integration pages stuck behind pagination
Hypothetical support tool Murmurdesk listed integrations in a directory split across many paginated pages, so some reached a depth of 12 in a site crawl. The most searched partners were among them.
The team added category pages, such as CRM and chat tools, linked them from the directory, and added links between related integrations. Pages that mattered moved to a depth of three.
Common mistakes
Flattening everything
Linking every page from the homepage removes the hierarchy that helps people and crawlers understand the site. Aim for sensible paths to important pages.
Treating a sitemap as the fix
A sitemap helps with discovery, but it does not give a page the internal links and context it lacks.
Frequently Asked Questions
There is no official number. Many teams try to keep important pages within a few clicks of the homepage, which is a practical habit rather than a Google rule.
No. A URL with many folders can be linked straight from the homepage, and a short URL can be buried. Crawl depth depends on links rather than on the path.
Keep reading
- Click Depth: Click depth is the number of clicks it takes to reach a page from the homepage. Pages buried deep tend to be crawled less often and get less internal link value.
- Crawl Budget: Crawl budget is the number of URLs a search engine is able and willing to crawl on a site in a given period.
- Internal Linking: Internal linking is linking from one page on your site to another. It helps search engines find and understand pages and guides readers to the next step.
- Site Architecture: Site architecture is how a site's pages are organized and linked together, which shapes how visitors and crawlers find and value them.
- AMP: AMP is a web framework for building fast-loading pages under strict rules on JavaScript and CSS. Google no longer requires it for the Top Stories carousel.
- Cache-Control: Cache-Control is an HTTP header that tells browsers and CDNs whether and how long to store a response. Good caching makes repeat loads and crawls faster.
- Canonical URL: A canonical URL is the version of a page search engines treat as the main one when several URLs show the same or very similar content.
- Canonicalization: Canonicalization is the process of choosing one preferred URL when several pages have duplicate or very similar content, so search engines know which version to show.
