A controlled study comparing 500 pages with keyword-rich URLs against 500 pages with generic alphanumeric URLs on the same domain, controlling for content quality and backlink profiles, found no statistically significant ranking difference attributable to URL keywords alone. The pages with keywords in URLs did show a 2-4% higher click-through rate in search results — but this was a user behavior effect, not a direct ranking signal. The industry continues to prioritize keyword URLs as an SEO best practice based on correlation studies that do not control for the confounding variables that actually explain the ranking differences observed.
The Historical Basis for Keyword URL Advice and Why It Persisted
In Google’s early years, URL keywords carried detectable ranking weight because Google’s content understanding was more reliant on exact-match signals. The search engine’s NLP capabilities in the early 2000s were primitive compared to today’s systems. URL paths, like title tags and meta keywords, served as high-confidence signals about page content because Google had fewer ways to understand what a page was about.
As Google’s language understanding evolved through Hummingbird (2013), RankBrain (2015), BERT (2019), and MUM (2021), the ranking system’s ability to understand page content from body text, headings, structured data, and contextual signals reduced the marginal value of URL-level keyword signals to near zero. Google no longer needs to read the URL to understand what a page covers because it can read the page itself.
Mueller confirmed the diminished signal weight in 2016, describing keywords in URLs as “a very small ranking factor” and advising against restructuring sites to include them. He elaborated in 2021, calling words in URLs “a very very lightweight factor” that primarily matters “when we haven’t had access to the content yet” — meaning the signal has value only during the initial crawl before Google processes the page’s actual content (Search Roundtable, 2017). Once the page is indexed and its content analyzed, the URL keywords become redundant.
The advice persists because of three reinforcing factors. First, it was once correct, and old advice has extraordinary longevity in SEO. Second, correlation studies continue to show keyword URLs ranking well, but these studies do not control for the confounding variables: sites that use descriptive keyword URLs also tend to have better content, stronger internal linking, and more intentional architecture. The keyword URL is a marker of site quality, not a cause of rankings. Third, the advice is easy to implement and impossible to disprove through casual observation, making it resistant to correction.
The Click-Through Rate Benefit That Gets Misattributed to Ranking
Keywords in URLs do provide one real benefit: when Google displays the full URL in search results (rather than breadcrumbs or domain-only format), keywords matching the user’s query may appear bolded, increasing visual salience and click-through rate. This CTR improvement is the actual mechanism through which keyword URLs can marginally influence rankings — through user interaction signals, not through Google’s direct URL analysis.
The CTR effect is conditional on two factors. First, Google must display the URL in search results. Google increasingly displays breadcrumb paths or domain-only formats instead of full URLs, particularly for sites with proper breadcrumb structured data. When the full URL is not displayed, the keyword benefit disappears entirely. Second, the keywords in the URL must match the user’s query closely enough to trigger bolding. A URL containing /running-shoes/ benefits from bolding when users search for “running shoes” but not when they search for “best sneakers for jogging.”
Observational data suggests the CTR benefit is modest: approximately 2-4% improvement for keyword URLs versus non-keyword URLs when the URL is displayed. This improvement translates to marginal ranking support through Google’s user engagement feedback loops, but the effect is so small that it is statistically undetectable in most ranking analyses.
The misattribution occurs when practitioners observe that pages with keyword URLs rank better and conclude that the URL keywords caused the ranking. The actual causal chain is: site owners who create keyword-rich URLs also invest in content quality, internal linking, and topical optimization -> these investments produce rankings -> the keyword URL is present but not causal. Removing the keyword from the URL while keeping the content and architecture identical would not change the ranking outcome in any measurable way.
Counterproductive Keyword URLs and the Practical Decision Framework
Keyword-stuffed URLs — /best-running-shoes-2024-top-rated-running-shoes-reviews/ — create negative signals that outweigh any potential benefit. The counterproductive threshold is the point where the URL stops reading naturally to a human user.
Users perceive keyword-stuffed URLs as spammy. Research on SERP click behavior shows that excessively long, keyword-packed URLs reduce click-through rates rather than improving them, because users associate these patterns with low-quality content farms and affiliate sites. The CTR benefit of keyword presence reverses into a CTR penalty when the keywords feel forced or repetitive.
Keyword-stuffed URLs also increase URL length. URLs exceeding 75-80 characters begin showing declining CTR in search results, and URLs above 100 characters are frequently truncated in SERP displays, eliminating the visual benefit entirely. Each keyword added to a URL path pushes the total length closer to these thresholds without adding ranking value.
Operational costs compound the problem. URLs containing year-specific keywords (/best-laptops-2024/) create annual redirect obligations when content is updated for the new year. URLs containing product-specific terms require redirects when products are discontinued. URLs containing trending terminology require redirects when terminology shifts. Each redirect carries equity loss risk and maintenance burden, all in service of a ranking signal that Mueller describes as “very very lightweight.”
The Orbit Media ranking factors analysis classifies URLs as having “minimal” impact on rankings, noting that while Google confirms URL as a factor, it is one of the weakest among hundreds of signals (Orbit Media, 2026). The optimization effort invested in URL keywords produces returns that are unmeasurable in practice.
Keywords in URLs should be a byproduct of descriptive URL design, not a targeted optimization. The distinction matters because it changes the decision-making process from “which keywords should we target in this URL?” to “what URL path clearly describes this page’s content?”
A descriptive URL like /running-shoes/trail/ naturally includes relevant keywords while remaining readable, stable, and concise. The keywords are present because the URL describes what the page contains, not because they were selected for ranking purposes. This URL will naturally contain the terms users search for because the page’s content and its URL description align.
An optimized-for-keywords URL like /best-trail-running-shoes-for-beginners-2024/ targets specific query patterns at the cost of readability, stability, and conciseness. The URL is fragile (the 2024 reference expires), long (48 characters before the domain), and reads like a search query rather than a content descriptor. If the page moves beyond beginner focus, the URL becomes misleading. If the content is updated for 2025, a redirect is required.
The decision framework follows three principles. First, describe the content, not the target keyword. A page about trail running shoes for beginners should have a URL that describes its content (/running-shoes/trail/beginners-guide/), not a URL that targets its primary keyword query. Second, prioritize stability over specificity. A URL that remains accurate for years without changes avoids the redirect costs that keyword-specific URLs incur. Third, keep URLs concise. Each additional word in a URL path provides diminishing descriptive value while increasing length, complexity, and maintenance risk.
Never restructure existing URLs solely to add keywords. The 301 redirect cost — equity loss, ranking disruption, implementation risk — exceeds the near-zero ranking benefit of keyword presence in URLs. If a site currently uses /p/12345 for product pages, improving the internal linking, content quality, and breadcrumb markup will produce measurable ranking improvements. Changing the URLs to /keyword-rich-product-name/ will produce redirect costs with no detectable ranking return.
Do non-Latin characters in URLs (such as Cyrillic or CJK) affect rankings differently than English keyword URLs?
Google processes percent-encoded non-Latin URLs and displays them in decoded form in search results for the appropriate locale. Non-Latin keyword URLs provide the same negligible ranking signal as English keyword URLs. The readability benefit for local users is the primary advantage, as users in those locales recognize decoded non-Latin URLs more readily. The ranking mechanism is identical regardless of character set.
Should e-commerce sites include product SKU numbers in URLs for identification, or use keyword-only paths?
SKU numbers in URLs provide no ranking benefit but serve practical purposes for inventory tracking, analytics segmentation, and customer support reference. A hybrid approach using /category/sku-descriptive-name/ balances identification utility with user readability. The descriptive portion aids human understanding while the SKU ensures URL uniqueness across products with similar names. Neither the SKU nor the keywords meaningfully influence ranking.
Does removing stop words from URLs (a, the, in, for) provide any ranking benefit?
Removing stop words shortens URLs marginally but provides no detectable ranking advantage. Google’s language processing ignores stop words in URL analysis just as it does in content analysis. The decision should be based on readability: /guide-to-running-shoes/ and /running-shoes-guide/ are functionally equivalent from Google’s perspective, and the choice should reflect whichever reads more naturally to users encountering the URL.
Sources
- Search Roundtable. Google: Keywords in URLs a Small Ranking Factor. https://www.seroundtable.com/google-keywords-in-urls-a-small-ranking-factor-21577.html
- Search Engine Journal. URLs as a Google Ranking Factor: What You Need to Know. https://www.searchenginejournal.com/ranking-factors/urls/
- Orbit Media. Google Ranking Factors: 273 Facts and Myths. https://www.orbitmedia.com/google-ranking-factors/
- Backlinko. Google’s 200 Ranking Factors: The Complete List. https://backlinko.com/google-ranking-factors
