Quick answer
Crawl depth (click depth) is the minimum number of internal links a crawler or user must follow from the homepage to reach a page. Shallow pages are usually discovered and recrawled more often than deep ones.
What is crawl depth?
Crawl depth (also called click depth) is the number of links a crawler or visitor has to follow from the homepage to reach a page. The homepage is depth 0, pages linked from it are depth 1, pages linked from those are depth 2, and so on, always counting the shortest path.
It is a property of your internal link structure, not of the URL. /blog/2021/03/post can be at depth 2 if the homepage links to it, while /pricing can be at depth 4 if nothing prominent links to it.
Crawl depth vs related terms
| Term | Measures | Example |
|---|---|---|
| Crawl depth / click depth | Shortest link path from the homepage | 3 clicks: home → blog → category → post |
| URL depth | Number of folders in the path | /a/b/c/page has 3 folders |
| Crawl budget | How many URLs a search engine will fetch in a period | Thousands per day on a large site |
| Crawl depth limit (in a tool) | How far a crawler is configured to go | "Stop at depth 10" |
Why crawl depth matters
- Discovery and recrawl frequency. Search engines tend to find and revisit shallow pages more often. Deep pages may be crawled rarely or not at all.
- Internal link signals. Pages close to the homepage typically receive more internal links and more of the site's link signals.
- Users. If people need five clicks to reach a product, most will not.
There is no official maximum, and the "three-click rule" is a heuristic rather than a ranking rule. As a practical target, keep important pages within three or four clicks of the homepage.
Worked example: how pagination buries content
A blog has 600 posts and lists 10 per page with only "Next" links (sample):
| Setup | Pages in the list | Depth of the oldest post |
|---|---|---|
| 10 per page, "Next" link only | 60 | 61 (home → blog → 59 × Next → post) |
| 48 per page, "Next" link only | 13 | 14 |
| 48 per page, numbered links to every page from page 1 | 13 | 3 (home → blog → page 13 → post) |
| Plus category hubs linked from the homepage | — | 3 for every post via its category |
The content did not change; only the links did. Our own blog lists 48 posts per page for this reason, with category pages as a second route in.
How to measure it
- Crawl the site from the homepage with an SEO crawler and export each URL's depth.
- Plot the distribution: how many URLs at depth 1, 2, 3 and beyond. A long tail past depth 5 is a warning sign.
- Cross-check with logs: pages at high depth that search engines rarely fetch confirm the problem; see log file analysis for SEO.
- Look for orphans: pages with no internal links at all have no depth; they are orphan pages reachable only through the sitemap or external links.
How to reduce crawl depth
- Hub pages for each topic or category, linked from the main navigation.
- Numbered pagination (or a "view all" page) instead of "Next" links alone; avoid infinite scroll without crawlable links.
- Related links at the end of articles and products, so pages link sideways, not only up and down.
- Breadcrumbs that link back to category levels.
- Link new content from the homepage or a "latest" section until it is linked from elsewhere.
- Sitemaps help discovery, but do not replace links; a URL only in the sitemap still has no internal link signals.
In TapCub
Crawl depth comes from your link graph, which a site crawler measures. TapCub shows the result from the search engine's side: the crawl health report lists how many distinct pages each engine fetched, and, if you add your sitemap URL, which sitemap pages have not been fetched yet and how long new pages waited for their first crawl. Pages that stay unfetched are usually deep or orphaned. See crawl budget and how often Google crawls a site.
Sources
- Google Search Central. SEO starter guide: link to relevant resources.
- Google Search Central. Large site owner's guide to managing your crawl budget.
- seoClarity. What is crawl depth?
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Customer Experience Consultant
Writes about live chat, visitor conversations, and self-service, sharing practical ways to make customer communication clearer and more effective.