Official statement
Other statements from this video 10 ▾
- 2:17 Est-ce qu'ajouter du contenu hors-sujet sur un site pénalise vraiment son ranking ?
- 5:18 Faut-il vraiment abandonner les sous-domaines pour un site unique ?
- 12:07 Ajouter de nouveaux produits dilue-t-il vraiment vos signaux SEO ?
- 25:21 Faut-il vraiment optimiser manuellement chaque meta description si Google les réécrit ?
- 26:27 AMP, JavaScript et mobile : quelles priorités pour optimiser votre référencement ?
- 46:40 Google utilise-t-il vraiment les mêmes algorithmes pour tous les secteurs ?
- 60:30 Faut-il vraiment personnaliser les avis produits pour chaque fiche ?
- 60:49 Les avis répliqués peuvent-ils détruire vos snippets enrichis ?
- 68:36 Pourquoi Google crawle-t-il certaines pages plus souvent que d'autres ?
- 76:01 L'HTTP/2 améliore-t-il vraiment le SEO sans intervention manuelle ?
Google confirms that robots.txt is not the solution for removing indexed pages. The URL removal tool or the noindex tag remain the recommended methods. The catch? A robots.txt block prevents Googlebot from seeing the noindex, creating a vicious cycle where the page remains indexed indefinitely.
What you need to understand
Why doesn't robots.txt truly deindex content?
The robots.txt file controls Googlebot's access to your URLs. Blocking a page via robots.txt prevents the bot from crawling its content, but does not force its removal from the index. The page may still appear in search results with a truncated description.
Google needs to actively crawl a page to detect a noindex or a 404. If you block access in robots.txt and then add a noindex in the HTML, the bot will never see that directive. The result: the page remains indexed with its previous state, sometimes for months.
What exactly does John Mueller recommend?
Mueller points to two concrete solutions. First, the URL removal tool in Search Console allows for almost immediate removal (a few hours). It’s the emergency solution when you accidentally blocked access and the page is already indexed.
Next, if you have server access, temporarily remove the robots.txt block, add the noindex meta tag in the <head>, let Google crawl the page, and then block it again if necessary. This sequence ensures that Google registers the deindexing instruction.
What is the correct timeline for actions?
The confusion comes from the timing. Many practitioners first block in robots.txt, thinking they are protecting the content, and then try to add a noindex. This is the opposite of what works.
The effective sequence is: noindex first, then robots.txt (if truly necessary). Or use the removal tool directly without touching robots.txt. The robots.txt block should only be used to save crawl budget on entire sections, never as a deindexing method.
- Robots.txt blocks crawling, not indexing: a page can remain indexed without being crawled
- Noindex requires active crawling to be detected and applied by Google
- The URL removal tool acts within hours, but it’s temporary (6 months)
- Blocking then noindex creates a deadlock: Google cannot see the directive
- The correct sequence: noindex first, wait for recrawl, possibly block afterward if needed
SEO Expert opinion
Does this recommendation really reflect on-the-ground practices?
Yes, and it’s one of the rare cases where Google's doctrine perfectly aligns with observations. In thousands of audits, pages blocked by robots.txt remain indexed in 80% of observed cases if they were indexed before the block. The snippet then displays "No information available," yet the URL occupies the SERPs.
The problem intensifies with large sites. A massive robots.txt block (like Disallow: /blog/) can freeze hundreds of indexed pages. They do not disappear; they linger in the index. I have seen cases where pages blocked for 18 months still appeared in brand searches.
What are the grey areas not explained by Mueller?
Mueller is vague on one point: how long to keep the robots.txt open after adding the noindex? In theory, a few days are sufficient. In practice, on low crawl frequency sites, waiting 2-3 weeks is more prudent. [To be verified] according to your actual crawl budget.
Another silence: what to do if you have already blocked AND the page is indexed for a long time? The removal tool expires after 6 months. Should you remove the block permanently or just temporarily? Google does not provide a clear SLA. My approach: unblock for 3-4 weeks, check for deindexing via site:, reblock if absolutely necessary.
In what cases can this rule be bypassed?
There is a scenario where robots.txt + deindexing works without deadlock: pages never indexed. If you block a section before it is crawled, there is no issue. This is actually the primary usage of robots.txt: to prevent preemptive indexing.
Special case: password-protected pages or 401/403. Google gradually deindexes them even when blocked by robots.txt because it receives an explicit HTTP code. But it's slow (several months) and unpredictable. If it's urgent, the removal tool remains the only guarantee.
Practical impact and recommendations
What should you do if your pages are already blocked and indexed?
First step: Search Console audit. Go to Coverage > Excluded > “Blocked by robots.txt.” If any URLs appear there AND are present in the index (check with site:yourdomain.com URL), you are in the problematic case described by Mueller.
Immediate action: use the URL removal tool in Search Console for each critical page. Expect a 6-12 hour effective removal time. Meanwhile, temporarily remove the relevant Disallow line in robots.txt, add <meta name="robots" content="noindex, nofollow"> in the <head> of those pages.
How to avoid this trap with new content?
Reverse your workflow. Before launching a sensitive section (staging, testing, duplication), place the noindex as soon as it goes live. Let Google crawl it at least once. Check in Search Console that the pages are marked “Excluded by noindex.” Only afterward, if you want to save crawl budget, add a Disallow in robots.txt.
For e-commerce sites with filters and facets, prefer URL parameters in Search Console over robots.txt. This prevents accidentally blocking legitimate product pages. And if you absolutely must block (e.g., session parameters), document each robots.txt rule with a comment explaining why it exists.
What tools should be used for effective monitoring?
Set up custom Search Console alerts for “Blocked by robots.txt” errors. Crawl your site monthly with Screaming Frog in “Respect robots.txt” vs. “Ignore robots.txt” mode. Compare the two exports: any URL absent from the first but present in Google’s index is an anomaly.
Automate a script that queries the Google Indexing API about your sensitive URLs. If a page blocked by robots.txt comes back as indexed, trigger an alert. These cross-checks take 30 minutes a month but can prevent SEO disasters.
- Audit pages marked “Blocked by robots.txt” in Search Console and verify their presence in the index
- Use the URL removal tool as an emergency, then correct with noindex and recrawl
- Place noindex BEFORE any robots.txt blocking on new content
- Document each Disallow rule in robots.txt with an explanatory comment
- Crawl the site monthly in robots.txt respected vs ignored mode to detect inconsistencies
- Set up automatic alerts for blocking errors via the Search Console API
❓ Frequently Asked Questions
Peut-on désindexer une page uniquement avec robots.txt ?
L'outil de suppression d'URL est-il permanent ?
Combien de temps après un noindex la page disparaît-elle de l'index ?
Faut-il retirer définitivement le blocage robots.txt après avoir ajouté un noindex ?
Que faire si des centaines de pages sont bloquées et indexées ?
🎥 From the same video 10
Other SEO insights extracted from this same Google Search Central video · duration 59 min · published on 15/12/2015
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