Google PageRank: Complete Guide to Link-Based Authority Algorithm

What is PageRank

PageRank is the algorithm Larry Page and Sergey Brin developed at Stanford University in 1998, forming the foundation of Google's search engine. The name simultaneously references inventor Larry Page's surname (Page) and web pages (Page).

PageRank's core idea is democratic voting. If page A links to page B, A is considered to have "voted" for B. The more pages vote for B, and the more authority the voting pages themselves have, the higher B's PageRank score.

Expressed as a formula:

PR(A) = (1-d) + d × Σ [PR(Bi) / C(Bi)]

• d: Damping factor (typically 0.85)
• Bi: Pages linking to A
• C(Bi): Number of outbound links from page Bi

In other words, the authority (PR) of the linking page divided by that page's total outbound links is passed along. More links mean each link passes less value ("link juice").

Historical evolution of PageRank

Google retired the publicly visible Toolbar PageRank in 2016, causing the misconception that "PageRank is gone." However, PageRank as an internal ranking system still operates as a core signal. Internal materials from the 2024 DOJ vs Google case confirmed Google still calculates per-page PageRank scores.

Why link quality matters more than quantity

Early PageRank was based purely on link count. This led to spam link farms and link exchange programs. Google continuously upgraded the algorithm to reflect link quality.

Factors affecting PageRank today:

• Domain relevance: Links from same industry/topic sites are more valuable
• Link position: Contextual in-body links are stronger than sidebar/footer links
• Anchor text: Link text that accurately describes the destination topic is more valuable
• dofollow vs nofollow: nofollow links do not pass PageRank (but help discovery and indexing)
• Link velocity: Abnormally fast link growth may be detected as manipulation

Internal PageRank: importance of site link structure

PageRank applies not only to external backlinks. Internal links also pass PageRank. Homepages tend to receive the most external links, so linking from the homepage to important internal pages distributes PageRank.

Internal PageRank optimization principles:

1. Pillar page-centered structure: Concentrate internal links on core service and category pages
2. Minimize click depth: All important pages should be reachable within 3 clicks from home
3. Remove orphan pages: Pages without internal links receive no PageRank
4. Fix broken links: Links to 404 pages waste PageRank

PageRank vs Domain Authority (DA/DR)

Because internal PageRank is not public, various substitute metrics emerged:

These differ from Google's actual PageRank and should be used as reference only. Google recognizes no official external link metrics.

PageRank application in local markets

Naver uses a link evaluation system similar but different from PageRank. For Naver SEO:

• Naver blog and cafe links have significant influence
• Links from Daum and Kakao platforms may carry weight in Naver
• Major media links (Naver News partner outlets) carry high authority

Rankings on Google in any region apply the global Google algorithm, so businesses targeting local markets still need high-quality backlink strategies.

Frequently asked questions

Q. I heard PageRank is gone. Is it still used?
A. Toolbar PageRank (the public 0–10 score) was retired in 2016. But PageRank as an internal ranking signal is still used by Google, confirmed in 2024 court submissions.

Q. Are DA and PageRank the same?
A. No. DA is a third-party Moz metric attempting to mimic Google's actual PageRank. They correlate but Google does not use DA as a ranking signal.

Q. Are nofollow links completely worthless?
A. They do not directly pass PageRank but have value for traffic, brand mentions, and discovery. Since 2019, Google treats nofollow as a "hint," leaving room for some PageRank value.

Q. Will PageRank rise quickly if I increase links fast?
A. Abnormally rapid link growth in a short period may be detected by Google SpamBrain as manipulation. Steadily acquiring quality links at a natural pace is safer.

Q. Do internal links affect PageRank?
A. Yes. Internal links distribute PageRank within the site. Linking more internal links to important pages can raise those pages' PageRank.

Related sources

• Brin, S., & Page, L. (1998). The Anatomy of a Large-Scale Hypertextual Web Search Engine. Stanford University. https://research.google/pubs/the-anatomy-of-a-large-scale-hypertextual-web-search-engine/
• Google Search Central (2024). How Google Search works: Analyzing & organizing information. https://developers.google.com/search/docs/fundamentals/how-search-works
• U.S. Department of Justice v. Google LLC (2024). Trial evidence and exhibits referencing internal ranking systems.