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Official statement

Domain Authority (DA) is not defined by Google, and John Mueller doesn’t know what factors are taken into account to calculate this metric. For Google, links should be created naturally and not artificially.
3:36
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Extracted from a Google Search Central video

⏱ 1h13 💬 EN 📅 16/10/2015 ✂ 21 statements
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Other statements from this video 20
  1. 0:32 Faut-il vraiment désavouer les liens de l'ancien domaine après une migration ?
  2. 6:45 Pourquoi un excès de redirections 301 peut-il tuer votre crawl budget ?
  3. 7:15 Google traite-t-il vraiment toutes vos redirections comme vous le pensez ?
  4. 14:00 Google Analytics influence-t-il vraiment le classement de vos pages ?
  5. 15:07 Combien de temps Google met-il vraiment à intégrer une refonte de structure de site ?
  6. 15:09 Comment Google gère-t-il vraiment les changements de structure de site ?
  7. 17:48 Un temps de réponse serveur lent ruine-t-il vraiment votre crawl budget ?
  8. 22:00 Les redirections 302 sont-elles vraiment traitées différemment des 301 par Google ?
  9. 31:57 Les erreurs 500 tuent-elles vraiment votre crawl budget et votre indexation ?
  10. 37:11 Les redirections 302 tuent-elles vraiment votre PageRank ?
  11. 38:26 L'outil de suppression d'URL de la Search Console retire-t-il vraiment vos pages de l'index Google ?
  12. 38:49 Faut-il vraiment utiliser noindex plutôt que robots.txt pour gérer les pages de faible valeur ?
  13. 41:07 Les redirections 301 font-elles perdre du PageRank lors du passage en HTTPS ?
  14. 42:29 Comment les signaux internes de votre site influencent-ils vraiment le crawl et le ranking Google ?
  15. 44:54 Google peut-il vraiment crawler tous vos contenus JavaScript ?
  16. 45:00 Faut-il encore se préoccuper du schéma d'exploration AJAX pour le référencement ?
  17. 46:58 Faut-il vraiment rediriger toutes vos pages produits en rupture de stock ?
  18. 50:55 Panda et Penguin pèsent-ils encore vraiment dans le classement de vos pages ?
  19. 73:47 Le passage HTTPS fait-il vraiment perdre du PageRank en SEO ?
  20. 74:06 Les données structurées suffisent-elles pour intégrer le Knowledge Graph de Google ?
📅
Official statement from (10 years ago)
TL;DR

Google completely ignores Moz's Domain Authority (DA), and John Mueller admits he doesn't know how this metric is calculated. For Google, only the quality of natural links matters, not a score invented by a third-party tool. This is a harsh reminder that SEOs should stop selling this metric to clients as if it were an official indicator.

What you need to understand

Why does Google reject Domain Authority?

Domain Authority is a proprietary metric developed by Moz that rates websites on a scale from 1 to 100. The problem is that this score does not exist in Google's algorithms. John Mueller is clear about this; he doesn’t even know what signals Moz uses to calculate this score.

Google evaluates sites according to its own quality criteria and relevance, the exact details of which remain opaque. The internal PageRank still exists, but it is not the DA. Confusing a third-party metric with a Google ranking factor is like judging a company's health solely on its Yelp rating.

Does this metric have any value for an SEO?

DA can serve as a rough comparative indicator between two sites in a limited competitive context. It’s convenient for quickly explaining to a client why a competitor seems stronger. However, it is just a very approximate proxy.

The danger is that some SEOs present DA as a goal to achieve, which encourages the purchase of artificial links just to inflate that number. Google couldn't care less about your DA 45 or 62. What matters is the actual quality of backlinks, their context, and their thematic relevance.

What does a natural link really mean for Google?

A natural link is obtained without compensation, without exchanging money, and without artificially constructed site networks. It comes from a publisher who freely decides to cite your content because it adds value for their readers. The editorial context and thematic coherence are highly important.

Google is getting better at detecting artificial link schemes: PBN networks, triangular exchanges, bulk links purchased from shady directories. The Penguin update marked a turning point, and algorithms continue to refine this detection. A site with 1000 DA 30 links can be penalized while a site with 50 solid editorial links thrives.

  • Domain Authority is not used by Google and does not reflect its algorithm.
  • Aiming for an artificial increase in DA through purchased links is counterproductive and risky.
  • Natural and contextual links remain the only viable long-term strategy.
  • Google evaluates the quality of links according to its own internal criteria, which are not publicly disclosed.
  • The internal PageRank still exists but is not accessible nor equivalent to DA.

SEO Expert opinion

Is this statement consistent with field observations?

Absolutely. Audits regularly show sites with a high DA that stagnate in the SERPs while sites with average DA explode thanks to relevant content and targeted editorial backlinks. DA is often inflated by quantitative links that lack semantic value.

What hurts is that many agencies charge for services labeled ‘increasing DA’ without improving actual rankings. They chase a third-party metric instead of working on the signals that Google truly values: E-E-A-T, anchor relevance, thematic authority, and content quality. [To verify]: Moz does not precisely document how DA handles Google's algorithmic updates, which creates a permanent gap.

Why does this metric persist in the SEO industry?

Because it is easy to sell. A client immediately understands that a score of 65 looks better than 42. It’s visual, it’s straightforward, it provides reassurance. Explaining that one needs to evaluate the editorial quality of a backlink, its semantic context, and the health of the referring site takes time and pedagogy.

SEO tools also maintain this illusion by highlighting DA in their dashboards. Ahrefs has its Domain Rating (DR), Semrush has its Authority Score. All these third-party metrics are commercial approximations, not replicas of Google's algorithm. They sometimes correlate with performance, but correlation is not causation.

When can we still use DA without risk?

As a quick screening tool during a link-building campaign: eliminating obviously poor sites (DA < 10 with toxic profiles) or roughly comparing two opportunities. But never as a final goal or as a justification for a budget with a client.

Internally, for quick competitive benchmarking. If you see that your three main competitors have DAs between 55 and 65 and you are at 28, it gives an indication of the perceived authority gap by third-party tools, which may reflect a real gap in quality backlinks. But then you must dig deeper with a qualitative analysis, not stop at the number.

Warning: If a provider guarantees you an increase in DA without detailing their strategy for creating natural editorial links, run away. It’s probably link spam that will end up penalizing you.

Practical impact and recommendations

What should you actually do with this information?

Stop presenting Domain Authority as a relevant KPI in your client reports. Replace it with real Google metrics: organic traffic, positions on strategic queries, conversion rates from search, impressions, and CTR in Search Console. These are the data that matter for business.

Re-educate your clients who set DA objectives. Explain that Google does not look at this number and artificially optimizing it creates a penalty risk without real benefit. Instead, propose an audit of current backlinks to identify toxic links to disavow and editorial opportunities to exploit.

How can we assess the quality of a backlink without relying on DA?

Analyze the editorial context: is the link embedded in relevant content for your theme? Is the anchor natural or over-optimized? Does the referring site deal with topics consistent with yours? A link from a culinary blog to a plumbing site screams spam from miles away.

Check the health of the referring domain: real organic traffic, diversity of link sources, and absence of artificial schemes. A site with 500 backlinks all from the same network is toxic, no matter its DA. Use tools like Majestic (Trust Flow vs Citation Flow) or Ahrefs (ratio of referring domains to total backlinks) to detect these anomalies.

What mistakes should you absolutely avoid?

Never buy “high DA” link packages sold on forums or marketplaces. These links often come from PBN networks or compromised sites that end up being detected and penalized. You risk a manual action or an algorithmic loss that is difficult to recover from.

Also, do not systematically reject low DA sites. A niche blog with DA 18 but a relevant and engaged audience is better than a general directory with DA 50 packed with outbound links. The thematic relevance and real user engagement are signals that Google values much more than a Moz score.

  • Remove DA from your client reports and replace it with real Google KPIs (traffic, positions, conversions).
  • Audit your existing backlinks to identify toxic or irrelevant links to disavow.
  • Prioritize editorial content strategies that naturally generate citations and links.
  • Analyze each backlink opportunity based on qualitative criteria (context, relevance, real traffic) rather than third-party metrics.
  • Train your teams and clients to understand the difference between Google metrics and tool approximations.
  • Invest in press relations and editorial partnerships instead of link purchasing.
Mueller's statement reminds us of a fundamental truth: Google does not know about DA, does not use it, and does not care. For a serious SEO, this means refocusing the entire link-building strategy on editorial quality and thematic relevance. Measure success by positions, traffic, and conversions, not by a score invented by a third-party tool. These optimizations require fine expertise and continuous monitoring of the signals truly valued by algorithms. If you lack internal resources or find the complexity of these analyses overwhelming, hiring a specialized SEO agency can save you from costly mistakes and accelerate your progress in search results.

❓ Frequently Asked Questions

Le Domain Authority influence-t-il quand même indirectement le SEO ?
Non. Le DA est calculé par Moz selon ses propres critères, qui peuvent corréler avec des facteurs Google, mais Google n'utilise jamais ce score. Optimiser pour le DA revient à optimiser pour rien.
Dois-je complètement ignorer le DA dans mes analyses concurrentielles ?
Vous pouvez l'utiliser comme indicateur de présélection rapide, mais ne basez jamais une stratégie dessus. Analysez toujours la qualité réelle des backlinks, le trafic organique et les positions des concurrents.
Quelle métrique utiliser à la place du DA pour évaluer un site ?
Utilisez des données Google Search Console (impressions, positions, CTR), le trafic organique réel, la qualité éditoriale du contenu et l'analyse qualitative du profil de backlinks (pertinence, contexte, diversité).
Un site à DA faible peut-il bien se positionner sur Google ?
Absolument. Si le contenu est pertinent, l'E-E-A-T solide et les backlinks contextuels de qualité, un site à DA 25 peut surclasser un concurrent à DA 60 qui a gonflé son profil artificiellement.
Google a-t-il un équivalent interne du Domain Authority ?
Google utilise le PageRank interne et des centaines d'autres signaux pour évaluer l'autorité d'un site, mais ces métriques ne sont pas publiques et n'ont aucun rapport direct avec le calcul du DA par Moz.
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