Page depth is how many folders sit between a page and the homepage: example.com/blog/seo/ is depth 2, while example.com/a/b/c/d/ is depth 4. The deeper a page lives, the more clicks a visitor needs, the less often crawlers visit, and the weaker it tends to rank. The free Page Depth Analyzer measures the depth of your whole URL list at once.
Paste your URLs one per line - export them from your sitemap or CMS. The tool strips each URL down to its path, counts the segments, and reports the average depth, the deepest pages, and a distribution table so you can see the shape of your site at a glance.
Depth is not a ranking factor by itself, but it controls how easily authority and crawl budget reach a page. Keep your money pages shallow.