Do noindex pages really pass PageRank?

What does this noindex/follow combination really mean?

The noindex directive tells Google not to include a page in its search results. However, contrary to common belief, this exclusion does not prevent Googlebot from crawling the page or analyzing its outbound links.

When you use noindex alone without adding nofollow, the links on that page remain active algorithmically. Google follows them, evaluates them, and may transfer PageRank to the destination pages. This is counterintuitive for many practitioners who are used to thinking of a non-indexed page as 'dead' for SEO.

Why does Google maintain this technical distinction?

The separation between indexing and crawling allows for granular control. Some pages have a structural function without content value: sorting pages, filters, conversion tunnel steps. You don’t want them to appear in the SERPs, but you want their links to your strategic pages to count.

This architecture reflects the original logic of PageRank: a vote remains a vote even if the voting page itself is not intended to rank. Thus, Google retains the ability to map your site and understand the relationships between pages, regardless of their indexing status.

How does this rule apply in real crawling?

The transmission of PageRank from a noindex page is not automatic. It first depends on the crawl frequency of that page. If Googlebot never visits it, no juice flows, regardless of the directive.

Furthermore, the speed of deindexing plays a role. After adding noindex, Google may take several weeks to permanently remove the page from the index. During this transition period, the behavior of links may be erratic. Once the page is truly deindexed and the bot continues to crawl it regularly, PageRank transmission becomes effective and stable.

• Noindex alone: the page disappears from the index, but its links pass PageRank if crawled
• Noindex + nofollow: the page disappears AND its links no longer pass SEO juice
• Blocked by robots.txt: Google does not crawl the page, so no links are followed or evaluated, and the URL may remain visible in the index with a generic description
• Effective transmission depends on crawl frequency and the actual deindexing delay
• A noindex page that receives quality internal links will be crawled more often and will better pass PageRank

Is this statement consistent with field observations?

Yes, and it is empirically verifiable. On e-commerce sites with thousands of noindex filter pages, it is observed that product listings linked from these intermediate pages retain their relative authority in the internal linking structure. If you remove these filter pages or set their links to nofollow, you generally see a decrease in crawling and sometimes in rankings for orphaned products.

That being said, the extent of transmission remains unclear. Google never quantifies the dilution factor applied to the PageRank crossing a noindex page. [To be verified]: some tests suggest a 100% transmission, while others point to partial degradation, especially if the noindex page is considered of low quality or is rarely crawled.

What are the edge cases where this rule does not apply?

First case: pages blocked by robots.txt. If you prohibit crawling, Google never sees the links, so no transmission is possible. Worse, the URL may remain visible in the index with a note 'no information available' if it receives external backlinks. It’s a classic mistake to block in robots.txt what you want to noindex.

Second case: orphaned or nearly orphaned noindex pages. If they only receive one or two internal links from pages that are themselves poorly crawled, Google may significantly space out its visits. The theoretically transmissible PageRank then remains latent, as the bot does not come frequently enough to distribute it effectively.

Should you always avoid nofollow on noindex pages?

No. There are situations where combining noindex + nofollow is the right strategy. Login pages, publicly accessible administration areas, thank-you pages post-form are examples where you don’t want them to rank or dilute PageRank to unnecessary targets.

Let’s be honest: most sites do not manage this granularity. By default, a noindex alone is generally sufficient. But on a complex site with a tight crawl budget, adding nofollow to purely functional noindex pages can free up crawl resources for your strategic pages. This is a second-level optimization, especially relevant beyond 10,000 indexable URLs.

What should you concretely modify in your linking strategy?

If you use noindex pages to structure your internal linking (thematic hubs, navigation pages, archives), ensure that they remain crawlable and receive enough internal links to be regularly visited by Googlebot. An isolated noindex page is useless: it must be integrated into the crawl flow to perform its role as a PageRank distributor.

Conversely, if you have noindex pages that serve no purpose (public drafts, test pages, technical duplicates), add nofollow or outright remove them. They consume crawl resources without providing value, and their outbound links unnecessarily dilute juice to non-priority targets.

How to audit your current use of noindex on your site?

Crawl your site with Screaming Frog or Oncrawl and export all pages with the noindex tag. Cross-reference this list with server log data to identify which pages are still crawled by Googlebot. A noindex page that has not been visited in 3 months passes nothing.

Next, check the outbound links from these pages: do they point to your strategic pages or to value-less URLs? If a noindex page links massively to pages that are themselves noindexed or blocked, you have a closed loop that wastes crawl. Clean up the linking or set those links to nofollow.

What technical mistakes should you absolutely avoid?

Never block in robots.txt a page that you want to noindex. Google will not be able to read the noindex directive, and the URL may remain visible in the index. Use robots.txt only to save crawl budget on non-SEO-interest resources (heavy PDFs, private areas, technical files).

Another common mistake is using noindex in the robots.txt file. This directive does not exist in the standard robots.txt norm. Only the meta robots or HTTP X-Robots-Tag headers are valid for noindex. Check your Nginx, Apache, or CDN configurations if you manage noindex server-side.

These technical optimizations require a detailed analysis of the architecture and regular monitoring of crawl logs. If your site exceeds a few thousand pages or if you notice crawl budget issues, it may be wise to consult a specialized SEO agency for a thorough audit and tailored action plan. Advanced internal linking and indexing directive management require sharp technical expertise, and a configuration error can cost dearly in organic visibility.

• Crawl the site and identify all currently present noindex pages
• Check in the server logs that these pages are indeed regularly crawled by Googlebot
• Analyze the outbound links from each noindex page: do they target strategic pages?
• Add nofollow on purely functional noindex pages without linking value
• Never block in robots.txt a page meant to be noindexed
• Control the technical implementation of noindex (meta, X-Robots-Tag, no fictitious directive in robots.txt)